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  Spatial and temporal distribution, size composition, and abundance of oval squid, Sepioteuthis lessoniana (Lesson 1830) in the coastal waters of Bolong, Zamboanga City, Philippines.

  Samson, Jesus Rolando (2019-07)

  The Palawan Scientist

  The study was conducted in the coastal waters of Bolong, Zamboanga City, Philippines purposely to determine the spatial distribution of Sepioteuthis lessoniana in relation to the depth of water and temporal distribution in relation to lunar phase using size composition and catch per unit effort (CPUE) data. Two sampling stations were established, namely, shallow-water station (Station 1) and deep-water station (Stations 2). Twenty units of squid traps were utilized in the study; ten of which were set in Station 1 and the other ten in Station 2. The traps were constructed using bamboo and green polyethylene netting. Instead of bait, coconut spikelet was placed inside the trap to lure squids. A motorized banca was used to set and haul the traps in the two sampling stations. Although hauling was done daily, sampling is scheduled only 12 times a month with three samplings per lunar phase. Catches were segregated according to sampling stations and lunar phases. Results of the study revealed that the squids caught in deeper waters were significantly larger than those caught in shallow waters, and that females dominated the shallow waters while males dominated the deeper waters. Furthermore, the catch during Full Moon was significantly higher than the catch of the other three lunar phases (p<0.05) with highest CPUE recorded in Station 2 during Full Moon (0.352 kg trap-1 day-1).
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  Backyard farming of tilapia using a biofloc-based culture system.

  Caipang, Christopher Marlowe; Avillanosa, Arlene (2019-07)

  The Palawan Scientist

  The pressures brought about by the increase in human population resulted in the rapid expansion of the food production industries including aquaculture to provide the nutritional requirements of the growing population. As aquaculture operations intensify, there is also an urgent need to preserve the environment; hence, all activities must be carried out in a sustainable way. The use of the biofloc technology (BFT) in aquaculture addresses these issues on restrictions on the usage of water and land as well as matters concerning sustainability of the production. BFT is a technique that maintains optimum water quality in the aquaculture system by manipulating the carbon and nitrogen ratios in the system. This optimum ratio favors the growth of heterotrophic bacteria that contribute in maintaining good water quality and at the same time provide sources of natural food for the cultured fish or crustaceans. In this review, the mechanisms of the biofloc technology particularly in the production of tilapia in freshwater systems are discussed. Moreover, some of the intrinsic advantages of this technology are highlighted in the context of developing and supporting backyard aquaculture of freshwater tilapias as a means of providing the food demands of the population in rural communities and as source of income for the marginalized small-scale fish farmers.
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  Water quality of Puerto Princesa Bay in relation to the presence of informal settlers in its coastal areas.

  Garcellano, Rhea; Japson, Loida; Wy, Siote (2022-06)

  The Palawan Scientist

  In this study, the water quality of four coastal areas in Puerto Princesa Bay, with and without informal settlers, were compared in terms of the phytoplankton composition and density, fecal coliform and physicochemical parameters during a 12-month sampling period. Microscopic examination and identification using phytoplankton monographs showed five harmful algal blooms (HABs) genera (Alexandrium, Dinophysis, Nitzschia, Pseudo-nitzschia, and Pyrodinium) with Dinophysis spp. as the most abundant in coastal areas with informal settlers and Pseudo-nitzschia spp. in areas without informal settlers. Eight phytoplankton genera (Coscinodiscus, Proboscia, Rhizosolenia, Skeletonema, Ceratium, Prorocentrum, Protoperidinium, and Oscillatoria) reported to have caused algal blooms were also observed with Coscinodiscus spp. as the most abundant in both groups of coastal areas. Multiple-tube fermentation technique showed fecal coliform count ranging from 4 to >1600 most probable number (MPN)/100 ml in the coastal areas with informal settlers and from <1.8 to 295 MPN/100 ml in areas without informal settlers. Multiprobe measurements showed that both groups of coastal areas have similar physicochemical characteristics with only the dissolved oxygen failing to meet the Philippine standards for class SB waters. There was a significant difference (P < 0.05) in water quality between the coastal areas with and without informal settlers in terms of fecal coliform and the density of four phytoplankton genera (Pseudo-nitzschia, Skeletonema, Alexandrium and Ceratium). However, there is no significant difference in terms of the physicochemical parameters. Regression analysis indicates that the presence of informal settlers could affect water quality in terms of fecal coliform and the five phytoplankton genera (Coscinodiscus, Pseudo-nitzschia, Skeletonema, Alexandrium and Ceratium).
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  Some biological aspects of bogue Boops boops (Linnaeus, 1758) from Saros Bay (Northern Aegean Sea, Turkey).

  Cengiz, Özgür (2022-06)

  The Palawan Scientist

  This study was conducted to determine the growth parameters, mortality and length at first maturity of bogue Boops boops (Linneaus, 1758) in Saros Bay (Northern Aegean Sea). A total of 363 specimens were obtained, monthly, from commercial fishermen between February 2016 and January 2017. The total length and weight of sampled fish ranged from 11.3 to 24.1 cm and from 16.61 to 165.32 g, with a mean of 16.9 cm and 60.40 g, respectively. The length-weight relationship was calculated as W = 0.0080TL3.13. The von Bertalanffy growth equations were computed to be 𝐿�∞ = 27.9 cm, k = 0.21 year-1, 𝑡�0 = -1.57 year. The growth performance index (𝛷�′) was found as 2.21. The length at first maturity was estimated as 16.6 cm. Total mortality rate (Z), natural mortality rate (M), fishing mortality rate (F) and exploitation rate (E) of the bouge were 0.44 year-1, 0.38 year-1, 0.06 year-1 and 0.13 year-1, respectively. The present study provides preliminary information on the growth parameters, mortality and length at first maturity of B. boops for the Saros Bay (Northern Aegean Sea, Turkey).
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  Length-weight relationship of selected catfish species from the stretch between downstream Lloyds Barrage and upstream Kotri Barrage, Indus River, Sindh, Pakistan

  Ghanghro, Mueed; Soomro, Anila Naz; Baloch, Wazir Ali; Malik, Samina; Qambrani, Ghulam Rasool; Channa, Muthar Ali; Ahmed, Aziz (2024-07-20)

  Pakistan Journal of Marine Sciences

  Catfishes are the crucial group in order Siluriformes occupy upper trophic levels due to their predatory feeding habits. This study examines the length-weight relationships of selected catfish species including Bagarius bagarius, Ompok bimaculatus, Heteropneustes fossilis, and Clupisoma garua collected from downstream Lloyds Barrage to upstream GM Barrage (Kotri Barrage) in the Indus River, Sindh, Pakistan. Fish samples were obtained over a year (July 2017 - June 2018) with the help of local fishermen and analyzed at the University of Sindh, Jamshoro. Measurements were taken using a digital balance, and regression analysis was performed using the cube law formula. The study found the regression parameters b and R² for B. bagarius (2.71 and 0.98), O. bimaculatus (2.82 and 0.94), H. fossilis (2.95 and 0.98), and C. garua (3.016 and 0.99). The "b" values suggested isometric growth for C. garua, while the other species indicated negative allometric growth. These values fall within the range (2.5-3.5), supporting the suitable growth of H. fossilis in the Indus River. This research provides vital baseline data for fisheries scientists, enhancing future studies and management strategies for these catfish species.
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  Food and feeding habits of Pomadasys kaakan (Cuvier, 1830) (family: Haemulidae) from Karachi Coast, Pakistan-northern Arabian Sea

  Jawed, Saba; Yousuf, Farzana; Ahmed, Quratulan; Baloch, Ateeqa (2024-07-20)

  Pakistan Journal of Marine Sciences

  This study focused on the feeding habits of P. kaakan, collected from Karachi fish harbor during January to December 2022. A total of (N=119) specimens were analyzed for gut content to understand their diet composition and monthly variations. The primary diet components identified were crustaceans, molluscs, fish, and miscellaneous items. The fullness index (FI) and coefficient of variance (CV%) also varied monthly, with the highest (FI) in July (50.0%) and the lowest in April (25.0%), while the (CV%) peaked in April (75.0%) and lowest in July (50.0%). Frequency of occurrence (FO%) of food items were highest in February, August, and September and lowest in March, April, and May. This research is pioneering in its comprehensive analysis of the P. kaakan diet composition from the Pakistani coastal waters those providing crucial insights into their feeding ecology. These findings offer valuable data for the effective management and conservation of this commercially important species, highlighting the importance of understanding their dietary habits for fisheries development and ecological sustainability.
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  The position and importance of Sinop in the Black Sea fisheries

  Bat, Levent; Arıcı, Elif; Özsandıkçı, Uğur (2024-07-20)

  Pakistan Journal of Marine Sciences

  Located in the northernmost part of Türkiye and situated on the Boztepe Peninsula, Sinop has a surface area of 5.791 km2. Sinop is one of the smallest provinces of Türkiye and covers approximately 0.8 percent of Türkiye's surface area. Sinop Province is one of the regions with the highest fish outflow in the southern Black Sea coast of Türkiye where the most intensive fishing is carried out. There are many fish meal-oil factories, aquaculture processing and utilisation facilities and cold storages in Sinop due to intensive fishing and production. Due to the potential of Sinop's fisheries, the biggest export income is also provided from here. There are also dam lakes with large water surface area in Sinop Province. An intensive amount of aquaculture is carried out from these dam lakes. In addition, Sinop coasts are seen as the most suitable conditions in the Black Sea Region as a new and strong alternative attraction centre for aquaculture facilities. Especially after 2018, serious aquaculture activities are carried out on the east coast of Sinop and there are many project applications for new potential areas on the west coast of Sinop. Anchovy, Atlantic bonito, horse mackerel, whiting, bluefish, flathead grey mullet, red mullet, shad, garfish, and turbot are among the most fished economic species on the coasts of Sinop. In the inland waters of Sinop, the most caught fish species are carp and pike. The only species produced in the inland waters of Sinop is rainbow trout. The production of trout as trade name Turkish Salmon started in 2018 on the coasts of Sinop and continues and peaked in 2022 with 17,332,975 kg. Exported to 48 countries, Turkish Salmon was 45,548,737 kg in January-November 2022 and this rate increased to 57,211,587 kg with a 26% change in January-November 2023. Sea bass was only farmed in cages on the coasts of Sinop in 2019 and 2020. Except for 2021, veined Rapa whelk have been caught from the coasts of Sinop for the last 10 years. Veined Rapa whelk meat is exported to USA, Korea, China, Japan, Taiwan, and Singapore. Operculum of veined Rapa whelk is exported to S. Arabia and Libya countries. Sand mussel from the Sinop coasts was caught only in 2022. With the newly planned marine aquaculture capacities on the coasts of Sinop, its contribution to Turkish aquaculture production continues to increase. This table shows that Sinop is one of the leading provinces of Türkiye in terms of aquaculture processing facilities.
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  Diversity and status of flatfish fishery at Balochistan Coast, Pakistan

  Muhammad, Asadullah Ali; Farooq, Sumera; Ali, Wajid (2024-07-20)

  Pakistan Journal of Marine Sciences

  Flatfishes are one of the most diverse fishes of the order Pleuronectiformes and are found worldwide and constitute a large proportion of the ground fish catch. The flatfishes are commercially important species of Pakistan having high value and sold locally at higher prices as well as exported in large quantities. The present study aimed to examine the current status of flatfish fishery and their diversity in the coastal waters of Balochistan, Pakistan. These fishes were caught and landed in large quantities at different harbors of Balochistan coast. 3 species in Family Cynoglossidae, 3 species of family Paralichthyidae and 3 species from family Soleidae were recorded. The Cynoglossus arel and S. elongata were the most abundant species and collectively accounts for 82 % abundance in the total flatfish landings. Sur bandar and Pasni are the main fishing grounds for flatfish fishery at Balochistan coast. The highest catch was reported at Sur bandar in 2018 with 2227.99 and 14496.416 in 2019 and the lowest catch reported in Gaddani in 2019 with only 6.55 metric tons. The high demand and increasing catch of these fishes requires a management approach.
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  Aquaculture nursery systems after infection with Vibrio harveyi

  Hlaing, Nwe Nwe Soe; Lashari, Punhal Khan; Kalhoro, Hameeda; Khaing, Thida; Nyint, Kaythi; Sandi, Phyo; Ali, Dilawar; Laghari, Muhammad Younis; Muhammad, Faiz; Dastagir, Ghulam; et al. (2024-07-20)

  Pakistan Journal of Marine Sciences

  Present study evaluated the survival, post-larvae quality, and the population of Penaeus monodon (Black tiger shrimp) and Oreochromis niloticus (Tilapia), after the addition of two strains of bacteria i.e Lactobacillus sp. and Bacillus sp. The Vibrio harveyi were isolated and identified from hatchery-reared larvae, at Biotechnology Research Department Ministry of Education, Republic of Union of Myanmar. Preliminary screening for antimicrobial activity of six Lactobacillus sp. and six Bacillus sp. Incubated and tested with V. harveyi using agar, well diffusion assay and tube screening methods. Inhibition activity results were the best at 3 days incubation for Lactobacillus sp. and the optimal result for inhibition activity for Bacillus megaterium at 5 days, with lactose sugar on V. harveyi. Before in vivo test, in vitro inhibition test of V. harveyi competition with probiotic of different concentrations of 10 ml/ton, 20 ml/ton, 30 ml/ton and 40 ml/ton. The results in all probiotic treatments were almost similar. Inhibitory affects were found in tube screening method, where, V. harveyi level reduced to 10 3 CFU/ml from 10 7 CFU/mlin 4 days. The pathogenicity test was conducted for a period of 2 days with Penaeus monodon (Black tiger shrimp) at post larval stages and Oreochromis niloticus (Tilapia) at fingerling stages, where they were exposed for 106, 107 and 108 CFU/ml of V. harveyi resulted 100% mortality. The probiotic treatment exhibited 50%, 70% and 80% survival rate of the fish infected with 106, 107 and 108 CFU/ml, respectively. It was detected the lower load of Vibrio ssp. bacteria with potential of pathogenicity after feeding with six Lactobacillus sp. and six Bacillus sp.
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  Comparison of biodegradable films derived from carrageenan extracted from red seaweeds along the Karachi coastline

  Iftikhar, Faiza; Tabassum, Asma; Aliya, R. (2024-07-20)

  Pakistan Journal of Marine Sciences

  This study aimed to assess and compare the properties of biodegradable films produced from carrageenan extracted from two indigenous seaweed species, Hypnea pannosa and Halymenia porphyraeformis, sourced from the Manora area of Karachi. Glycerol was employed as a plasticizer to enhance the tensile strength and elasticity of the biofilms. Results revealed a significant disparity in weight loss between Hypnea pannosa (40%) and Halymenia porphyraeformis (28%) during the soil burial test, while varying solubility rates were observed in different mediums. Moreover, Halymenia porphyraeformis exhibited higher tensile strength and elongation at break compared to Hypnea pannosa, indicating its superior gelling power and elasticity.
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  Acute toxicity of mercury to freshwater cultured milkfish Chanos chanos: Clinical symptoms and lethal concentration assessment

  Ezraneti, Riri; Khalil, Munawar; Affandi, Ridwan; Nirmala, Kukuh (2024-07)

  Journal of Marine Studies

  The increasing use of mercury in the industrial sector poses significant risks to freshwater ecosystems and aquatic organisms. Milkfish (Chanos chanos), a widely consumed species, is now being reared in freshwater environments, raising concerns about mercury bioaccumulation and food safety. This study aimed to determine the median lethal mercury concentration for milkfish at 96 hours (LC50) in freshwater using an experimental approach and probit analysis. Five mercury concentrations were tested: 0 (control), 0 .110 mg Hg/L, 0.195 mg Hg/L, 0.347 mg Hg/L, and 0.618 mg Hg/L. The results indicated that mercury is highly toxic to milkfish, with a 96-hour LC50 of 0.147 mg Hg/L. Clinical symptoms observed included loss of reflex movements, irregular swimming, frequent surfacing with widened mouth and operculum openings, convulsions, and ventilation of the ram before mortality. These findings highlight the acute toxicity of mercury in freshwater milkfish and underscore the potential health risks associated with mercury contamination in aquaculture systems.
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  Sharks and rays at Pelabuhan Perikanan Samudera (PPS) Lampulo, Banda Aceh, Indonesia: Morphometric characteristics and differentiators based on multivariate analysis

  Hikmah, Nur; Nufus, Hayatun; Syahrial, Syahrial; Ezraneti, Riri; Astuti, Rika (2024-07)

  Journal of Marine Studies

  Tropical marine environments are abundant and diverse; therefore, shark and ray research at fishing port PPS Lampulo, Banda Aceh City was carried out focusing on morphometric characteristics and differences based on multivariate analysis in July 2020 to identify sharks and rays that landed at fishing port PPS Lampulo, Banda Aceh City and determine their primary characteristics. The shark and ray samples used were from the Indian Ocean and the Malacca Strait and measured total length (TL), fork length (FL), and standard length (SL) for sharks and disc width (DW), TL, and disc length (DL) for rays. Principal component analysis (PCA) and discriminant analysis (DA) were performed on the morphometric data. The PCA analysis revealed that sharks and rays caught in Pelabuhan Perikanan Samudera (PPS) Lampulo, Banda Aceh City, can be divided into two distinct groups. The first group of sharks consists of species with large FL and SL morphometrics, namely P. kamoharai, C. plumbeus, P. glauca, and A. superciliosus. The second group of sharks consists of species with large TL morphometrics, specifically A. pelagicus and C. plumbeus. For the ray group, the first group comprises species with large TL and DW morphometrics, represented by A. ocellatus. The second group of rays consists of species with large DL morphometrics, namely P. sephen and H. jenkinsii. The results of DA revealed distinct differences in the size of sharks caught in the Indian Ocean and the Strait of Malacca, specifically in PPS Lampulo, Banda Aceh City. However, no significant differences in size were observed for the rays, regardless of whether their size was measured using DW, TL, or DL.
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  Compositional analysis of invertebrate communities in Raja Ampat conservation zones using environmental DNA (eDNA)

  Ruzanna, Arina; Madduppa, Hawis; Butet, Nurlisa Alias (2024-07)

  Journal of Marine Studies

  Raja Ampat conservation area is divided into three zones: the core zone, the tourism zone, and the open zone. This region is crucial for sustainable fisheries and environmental management, yet it is under significant anthropogenic pressure. Accurate species detection is essential for inventory and diversity surveys, and environmental DNA (eDNA) methods have been shown to be more effective than conventional techniques. This study aimed to evaluate whether V9 primers could detect multispecies invertebrate compositions, assess community structure and contributions within each zone, and identify significant differences in invertebrate diversity among the zones. A total of 66 eDNA samples were collected from water and sediment columns across the three zones. Samples were extracted using the NucleoSpin™ kit (Macherey-Nagel) protocol, amplified with universal eukaryote primers targeting the 18S gene, and sequenced using Illumina MiSeq. Taxonomic analysis was performed using QIIME2 software and the SILVA database. The study identified 19 invertebrate species. The Shannon-Wiener (H') and Simpson (D) indices revealed greater species diversity in the core zone compared to the tourism and open zones. However, the Kruskal-Wallis test indicated no significant differences in species diversity across the zones. SIMPER analysis demonstrated a high percent contribution of species in each zone. This study highlights the effectiveness of eDNA methods for biodiversity assessment and offers valuable insights into invertebrate community structures within the Raja Ampat conservation area.
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  Baseline study on the freshwater ornamental fish industry in Palawan, Philippines.

  Gonzales-Plasus, Maria Mojena; Plasus, Leo; Mecha, Niño Jess Mar (2022-06)

  The Palawan Scientist

  The status of both freshwater and marine ornamental fish industries in the Philippines has been assessed in 2019; however, Palawan was excluded due to the unavailability of data with regard to the ornamental fish trade. Hence, this study collected baseline data on the freshwater ornamental fish industry specifically the distribution of freshwater ornamental fish hobbyists, socio-demographic profile of the respondents, the key players involved in the market chain, classification and number of fish species and strains involved, and the challenges (economic and scientific) and opportunities encountered by the key players which could be used for the improvement and development of the ornamental fish sector in Palawan. A poll was conducted in order to obtain information on the general location of the ornamental fish hobbyists in Palawan in which 77 individuals participated. An online survey form was then sent to participants, however, only 40 responded. The freshwater ornamental fish hobbyists were distributed in 11 localities of Palawan. Key players involved in the market chain of freshwater ornamental fish were categorized as producers, traders, and sellers. Twelve freshwater ornamental fish species with 83 strains/varieties were involved, dominated by the Siamese fighting fish and guppy. Economic and research problems were some of the problems cited by the key players.
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  Spatial distribution and habitat suitability of seaweed on West Simeulue Island, Aceh Province, Indonesia

  Imamshadiqin, Imamshadiqin; Ritonga, Gara Hasonangan; Erlangga, Erlangga; Erniati, Erniati; Imanullah, Imanullah; Syahrial, Syahrial; Salmarika, Salmarika (2024-07)

  Journal of Marine Studies

  Seaweed is an important biological resource for human life, serving essential ecological functions, including providing shelter and feeding grounds for marine biota. Seaweed can be found in several Indonesian waters, growing naturally or through cultivation, including in the waters around Simeulue Island. This study aimed to assess the distribution of seaweed in relation to land suitability, using oceanographic parameters in Simeulue Island waters. The research was conducted at five stations within the West Teupah District, South Teupah District, and Alafan District. In situ measurements were taken to evaluate land suitability for seaweed growth based on oceanographic parameters such as current speed, depth, substrate type, salinity, temperature, pH, and dissolved oxygen. Results indicated that seaweed in Simeulue Island waters is distributed along the coastline and attached to coral reefs and rocks at depths of 2-5 meters. The total area of seaweed distribution is approximately 351.83 hectares along a coastline of 206.12 km. The measured parameters of seaweed habitats include a pH of 7.7 to 7.9, salinity of 31-35.3 ppt, temperature of 20-30 °C, dissolved oxygen levels of 3-4.8 mg/L, depth of 2-5 meters, current speed of 0.10 to 0.60 m/s, and a sandy coral substrate. Based on these water quality and substrate parameters, the seaweed habitats in Simeulue Island are classified as highly suitable, with suitability values ranging from 64 to 82. The recorded environmental conditions collectively support optimal seaweed growth.
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  Opportunities and risks of the blue economy for innovative companies in the sustainable aquaculture sector

  Miassi, Yann Emmanuel; Dossa, Kossivi Fabrice (2024-07)

  Journal of Marine Studies

  The oceans play a crucial role in the global ecosystem and offer solutions to meet the growing demand for food, water, and energy. However, a new economic concept is needed to regulate and sustainably exploit the maritime resources offered by the marine ecosystem to ensure sustainable development. It is in this initiative that the concept of the blue economy has emerged, in response to the inadequacy of measures taken by States to meet their obligations and achieve their objectives in terms of marine biodiversity conservation. This is how the blue economy concept was born, in response to the inadequacy of state measures to conserve marine biodiversity. This concept proposes an innovative solution integrating aquatic and human resources into sustainable economic activities. The aim of this study is to understand the opportunities and threats that the blue economy represents for innovative companies. This short literature review, based on a SWOT (Strengths, Weaknesses, Opportunities, and Threats) diagnosis of innovative companies, identified a number of obstacles to the development of the blue economy, such as climate change, lack of financing and the lack of instruments for measuring the performance of the blue economy. Action strategies could be implemented to mitigate risks, threats and hazards, and consider an economic approach that reconciles marine and terrestrial ecosystems.
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  Growth and survival of milkfish (Chanos chanos), tiger prawns (Panaeus monodon), and oysters (Crassostrea sp.) in integrated multi-trophic aquaculture (IMTA) system with varying stocking densities.

  Andika, Maulana; Muliani, Muliani; Khalil, Munawar; Department of Marine Science, Universitas Malikusaleh (2024-03)

  Journal of Marine Studies

  Integrated Multitrophic Aquaculture System (IMTA) is a sustainable approach to aquaculture, utilizing ecosystem dynamics by integrating various species. This study examined the growth and survival of milkfish (Chanos chanos), tiger shrimp (Penaeus monodon), and oysters (Crassostrea spp.) in IMTA systems with different stocking densities. A 30-day experiment using a nonfactorial-completely randomized design with four treatments and three replications was conducted. The results showed that the implementation of IMTA had no significant impact on the survival rate of milkfish, tiger prawns or oysters in all treatments. However, important variations in growth parameters were observed. Milkfish and tiger prawns showed the highest weight and length gain in treatment B, followed by treatments A, C, and D. Similarly, oysters showed optimal growth in treatment B, followed by A, C, and D, based on weight gain, length, width, and shell thickness. Throughout the study, the physicochemical parameters of the water remained within acceptable ranges, thus supporting ideal growth conditions for the cultured species. These findings underscore the potential of IMTA to increase aquaculture productivity while upholding the principles of environmental sustainability. By optimizing stocking density and encouraging species diversity, IMTA presents a promising avenue for advancing integrated aquaculture practices, in line with the FAO's blue economy concept and ecosystem approach to aquaculture. Future research should concentrate on refining the IMTA system and evaluating its long-term ecological and economic consequences.
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  Bioecological characteristics of mangrove snail in Langsa mangrove forest, Aceh, Indonesia: Diversity and community structure.

  Mardiah, Nur Ainun; Erlangga, Erlangga; Syahrial, Syahrial; Hadinata, Fitra Wira; Ezraneti, Riri; Barat, Welmar Olfan Basten; Leni, Yusyam; Department of Marine Science, Universitas Malikusaleh (2024-03)

  Journal of Marine Studies

  The most crucial aspect of managing an ecosystem or habitat is knowledge about accompanying biota, such as snails. The research on mangrove snails in the KPH Region III Aceh City of Langsa area was conducted in November 2021 with the goal of evaluating species diversity, density, ecological index, distribution, and their link to surrounding environmental conditions. Snail data was obtained via quadrat transects, with observation stations established using purposive sampling.The snail diversity was found to be five species from four families, with the highest density found in N. planospira (03.13 ind/m2). The diversity index was low (H' ≤ 2.0), dominance was moderate (0.5 < C ≤ 0.75), and uniformity tended to be balanced (0.5 < E ≤ 0.75). The distribution pattern is clustered (Iδ> 1), with C. cingulata being abundant (83.33%), and C. capucinus being frequently found (50.00%), N. planospiraonly found occasionally (36.11%), and L. scabra and T. telescopium are relatively uncommon (11.11% and 0.56%, respectively), with a link to environmental variables indicating that T. telescopium prefers fine mud substrates. Meanwhile, C. cingulata, C. capucinus, L. scabra, and N. planospiralive in habitats with fine mud substrates that are more solid than T. telescopium’s habitats.
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  Quantitative analysis of water quality parameters and their influence on the Pacific white shrimp (Litopenaeus vannamei) culture: A case study of Rancong mariculture area in Lhokseumawe, Aceh, Indonesia.

  Yessy, Lailan Try; Ezraneti, Riri; Khalil, Munawar; Department of Marine Science, Universitas Malikusaleh (2024-03)

  Journal of Marine Studies

  Water quality is one of several aspects that affect the success of aquaculture business. This study analyzes water quality and assesses its impact on aquaculture enterprises in the Rancong pond region of Lhokseumawe City. The study ran from November to December 2018. The water quality of the Rancong pond was sampled directly and tested in multiple labs. The field survey and purposive sampling strategy separated the research location into four stations with three water sampling points. Temperature, salinity, turbidity, brightness, pH, dissolved oxygen, alkalinity, total organic matter, BOD5, total ammonia nitrogen, nitrite, nitrate, phosphate, lead (Pb), total Vibrio bacteria, total general bacteria, and phytoplankton types and abundance were measured. The suitability of water quality is assessed using descriptive analysis, scoring, and matching. The investigation indicates that the quality and maintenance of the source water are highly suitable (S1). Traditional vannamei shrimp ponds in Rancong, Lhokseumawe City, should be maintained as fisheries cultivation areas.
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  Ecological characteristic of hermit crabs in Lhokseumawe mangrove forest, Aceh, Indonesia

  Fitriani, Fitriani; Erlangga, Erlangga; Syahrial, Syahrial; Ezraneti, Riri; Department of Marine Science, Universitas Malikusaleh (2024-03)

  Journal of Marine Studies

  The study was conducted between August and September of 2021 in order to determine the density, ecological index, distribution pattern, geographic distribution, environmental factors, and the relationship between hermit crabs and environmental factors. Hermit crabs were gathered using a quadratic transect and sample plots, while environmental variables were measured in situ. PCA and CCA multivariate statistics were used to determine the characteristics and correlation between hermit crabs and environmental factors. Hermit crabs were discovered to be comprised of two species (Clibanariuslongitarsus and C. infraspinatus) and one family (Diogenidae), with the highest density found in the C. longitarsus species (1.22 ± 0.57 – 4.68 3.53 ind/m2), diversity index is categorized as moderate (2.01), the geographical distribution is abundant (>80%), and environmental factors are categorized as good. In addition, Stations I and II have high DO, TOM, mangrove density, C. longitarsus, and C. infraspinatus parameters, whereas Station III has high salinity, pH, and temperature, with salinity, mangrove density, and TOM being the most influential parameters on hermit crab density.

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