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  • Benthic assemblages for ecological evaluation of Bardawil Lagoon, Mediterranean Sea, ‎Egypt.

    El komi, Mohamed Mohamed (2019-12-31)
    Bardawil Lagoon is the only highly saline oligotrophic lagoon in Egypt, has an area of ca. ‎‎650 km2 with water depths ranged 0.3m to 3m and economically important in terms of ‎fish production. It is the optimum zone getting migratory birds in winter. It is separated ‎from the Mediterranean Sea by a narrow sandy shelf (90 km length, and 22 km width). ‎Ecological evaluation of benthic communities in Bardawil Lagoon to follow-up study of ‎the distribution of benthic study at 12 selected sampling sites representing different ‎environmental habitats for long periods through the project of Environmental Study ‎Wetlands OF North Egyptians Lakes where samples were collected seasonally (2010-‎‎2015) and semi-annually (2015 - 2019). The results and data analysis indicated that the ‎distribution, composition and dominance of macro benthic organisms in Lake Bardawil ‎were composed mainly of Ostracoda, Polychaeta, Sea grasses, Bivalvia, Insecta larvae‏ ‏communities‏ ‏and dominated the constituent of bottom fauna. The variations in the ‎benthic biomass were the heaviest at sites elRaodh and meddle elRaodh representing ‎‎1354 and 1105 g/m2 which corresponding respectively to 18.2 % and 14.9% of the ‎annual average of benthic biomass (619 g/m2). Regional variations abundance of the ‎benthic structure was highest at sites elTelol and elRaodh representing 3486 ind/m2 and ‎‎3635 ind/m2 which corresponding respectively to 14.8% and 15.3% of the annual ‎average of benthic density (1978 ind/m2). Sites of sampling study were evenly spread (J’ ‎‎> 0.8) at most sites except at elTelol and elRaodh also, high diversity (H’ > 3.00) was at ‎the most sites and show lower value at sites elTelol, elGals, Boughaz I, elNaser, and ‎Raba`a while, Swartz Dominance indexes of number of 5 species over 75% showed low ‎values at sites elGals, Boughaz I, elNaser, and Raba`a. The abiotic environmental effects ‎in the Bardawil Lagoon are general to those generally observed in other areas influenced ‎by organic wastes, namely, changed in the physic-chemical properties of the sediments ‎and low oxygen concentrations in the bottom water due to decomposition of organic ‎materials.‎
  • Biometric properties of euryhaline fish the sand smelt Atherina boyeri Risso, ‎‎1810‎.

    Benzer, Semra (2019-06-30)
    In this study the presence of sand smelt Atherina boyeri Risso, 1810, an invasive and ‎translocated species has been reported in the Hirfanlı Dam Lake, Turkey. The fish ‎samples were collected from the fishermen operating in the area in April 2016. Twenty-‎three morphometric characteristics of A. boyeri, were taken, including standard length ‎‎(SL), fork length (FL), total length (TL), preorbital distance, eye diameter, interorbital ‎distance, head length, head width, dorsal fin I nose point distance, dorsal fin II nose ‎point distance, preanal distance, prepectoral distance, preventral distance, dorsal fin I ‎base length, dorsal fin II base length, anal fin base length, pectoral fin base length, ‎ventral fin base length, maximum body height, caudal peduncle height, body width, ‎caudal peduncle width, body weight (W). The SL varied between 62 to 75 mm and ‎weight 2.324 to 4.133 g in females. Whereas in males the SL varied between 56 to78 mm ‎and weight 1.533 to 4.011 g. The sex ratio was slightly in favour of females being 54.4%‎
  • Feeding habits of pick handle barracuda (Sphyraena jello) Cuvier, 1829 along the coast ‎of Pakistan‎.

    Manzoor, Hina; Zohra, Kashifa; Osmany, Hamid Badar (2019-06-30)
    A one year combined study of both sexes was conducted from March 2017 to February ‎‎2018 to investigate the feeding habit of Pick handle Barracuda (Sphyraena jello) Cuvier, ‎‎1829 locally called as Safaid kund along the coast of Pakistan, a large species found in ‎Pakistani water caught mainly by bottom set gillnet throughout the year. Samples ‎studied at Karachi fish harbor, in commercial catch which is the major landing center of ‎Pakistan. During this counting method was applied with naked eye. Mostly fishes ‎characterized by 91.66%, cephalopod 5.66% and shrimp 2.78% made the highest and ‎lowest stomach content respectively shoes carnivorous behavior of the species. ‎
  • Determination of mercury (Hg) in two sea cucumber species Ohshimella ehrenbergii ‎‎(Selenka, 1868) and Stolus buccalis (Stimpson, 1855) from the Karachi ‎coast.

    Ahmed, Quratulan; Bat‎, Levent; Ali, Qadeer Mohammad (2019-06-30)
    In this study the amounts of mercury (Hg) were determined in tentacles and muscle ‎tissues of O. ehrenbergii and S. buccalis from two coastal sites of Karachi; Buleji and ‎Sunehri during Southwest monsoon (August and September) and Northeast monsoon ‎‎(December and January) seasons of the year 2018. The mean amounts of Hg in edible ‎tissues of sea cucumbers were as follows: O. ehrenbergii (0.0176 mg/kg dry wt.) and S. ‎buccalis (0.0155 mg/kg dry wt.). Hg amounts in muscles of both species are much lower ‎than the maximum permissible limits (0.5 mg/kg wet wt.). Estimated Daily Intakes for ‎adults consuming O. ehrenbergii and S. buccalis are lower than published RfD values. ‎Total Target Hazard Quotient (TTHQ) values (0.00787) are also lower than 1, it may be ‎concluded that the consumption of these sea cucumbers from Karachi, do not pose any ‎health hazards to human as Hg amounts were concerned.‎
  • Interspecific isozyme variability in Porcellanid crabs (Crustacea: Decapoda: Anomura) ‎from the coastal waters of Pakistan.‎

    Naz, Farah; Odhano, Sahir; Saher, Noor Us; Kamal, Mustafa (2019-06-30)
    Polyacrylamide gel electrophoresis was used to investigate the interspecific isozyme ‎variability among three species of Porcellanid crabs: Petrolisthes ornatus, P. rufescens ‎and P. boscii from the coastal waters of Karachi, Pakistan. Seven enzyme systems and ‎the general protein (non-specific) were examined for genetic variations. Among the three ‎species; Nei's heterozygosity for overall loci was observed (0.067), whereas Shannon’s ‎information Index (I) for genetic variations based on the heterozygosity was (0.055) in ‎three species of Genus Petrolisthes. Species were differentiated from each other as Nei’s ‎genetic distance ranged in between 0.0093- 0.0314. The genetic relationship among the ‎three species of genus Petrolisthes similar from those inferred from morphological ‎features.‎
  • Morphometric characteristics of Indian mackerel (Rastrelliger kanagurta) landing at ‎three fish harbors of Baluchistan, Pakistan.

    Roonjha, Asif Ali; Bano, Azra; Siddique, Saima; Rasheed, Shazia‎ (2019-06-30)
    In the present study fifteen morphometric characters of Indian mackerel, Rastrelliger ‎kanagurta were studied. Collections were made from three fish harbors, Kund Malir, ‎Sonmiani and Gadani, Baluchistan, Pakistan. The morphometric lengths (total length, ‎fork length, standard length, head length, pre-dorsal fin length, pre-orbital length, eye ‎diameter, lower-jaw length, pre-anal fin length, head depth, pectoral fin length, pelvic fin ‎length, greatest depth and pre-pelvic fin length and pre-pectoral fin length) were recorded ‎and the descriptive statistical parameters and correlation coefficient (r) were analysis ‎with independent variable (total length) and dependent variable (other morphometric ‎parameters). The result shows that morphometric parameters are highly correlated to ‎total length. Coefficient of correlation (r) indicated highest positive correlation between ‎total length and forked length (r = 0.961, r = 0.928 and r = 0.919 at Kund Malir, ‎Sonmiani and Gadani, respectively).The maximum total lengths of R. kanagurta ‎recorded in the present study were 26.1 cm at Kund Malir, 26.3 cm at Sonmiani and 29.0 ‎cm at Gadani. This study provides knowledge to the biologists regarding morphometric ‎characters of Indian mackerel, Rastrelliger kanagurta from the fish harbors of ‎Baluchistan to help in planning of conservation strategies for this fish species.‎
  • Comparative study of significant molluscans dwelling at two sites of Jiwani coast, ‎Pakistan.

    Ghani, Abdul; Afsar, Nuzhat; Ahmed, Riaz; Qadir, Shees; Saleh‎, Saifullah‎; Majeed‎, Samroz‎; Imam, Najeeb (2019-06-30)
    During the present study collectively eighty two (82) molluscan species have been ‎explored from Bandri (25 04. 788 N; 61 45. 059 E) and Shapk beach (25 01. 885 N; 61 ‎‎43. 682 E) of Jiwani coast. This study presents the first ever record of molluscan fauna ‎from shapk beach of Jiwani. Amongst these fifty eight (58) species were found belonging ‎to class gastropoda, twenty two (22) bivalves, one (1) scaphopod and one (1) ‎polyplachopora comprised of thirty nine (39) families. Each collected samples was ‎identified on species level as well as biometric data of certain species was calculated for ‎both sites. Molluscan species similarity was also calculated between two sites. For ‎gastropods it was remain 74 %, for bivalves 76 %, for Polyplacophora 100 % and for ‎Scapophoda 0 %. Meanwhile total similarity of molluscan species between two sites was ‎calculated 75 %. Notable identified species from Bandri and Shapak includes Oysters, ‎Muricids, Babylonia shells, Trochids, Turbinids and shells belonging to Pinnidae, Arcidae, ‎Veneridae families are of commercial significance which can be exploited for a variety ‎of purposes like edible, ornamental, therapeutic, dye extraction, and in cement industry ‎etc.‎
  • Comparison of metal uptake capacities of the brown algae Cystoseira barbata and ‎Cystoseira crinita (Phaeophyceae) collected in Sinop, Turkey.

    Arici, Elif; Bat‎, Levent; Yıldız, Gökhan (2019-06-30)
    Cystoseira barbata (Stackhouse) C. Agardh, 1820 and Cystoseira crinita Duby, ‎‎1830 widely distributed and dominant in the Black Sea collected from Sinop coastal ‎zone to monitor the current situation of regional metal pollution during the 2015-2016. ‎ Macro-algae, sediments and seawater samples were analyzed for metal contents (Al, ‎As, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb and Zn) using inductively coupled plasma mass ‎spectrometry (ICP-MS). The methodology was provided by using standard reference ‎material BCR 279 – Ulva lactuca.‎ The general metal uptake of Cystoseira spp. displayed a tendency in the order of ‎Hg2 and BCF>5000) that was a good ‎indicator for Cystoseira species. As a result of measured values, it is seen that Sinop ‎region is below the pollution level. The observed results of the elemental accumulation ‎noticed that Cystoseira spp. could be used regularly as a bio-monitor of coastal pollution ‎in the study area.‎
  • A new record of the parasitic copepod, Lernanthropus indicus (Pillai, 1967) ‎‎(Siphonostomatoida: Lernanthropidae) from Karachi coast Pakistan

    Farooq, Sumera; Batool, Atia; Ara, Mubeen; Arshad, Nazia (2019-06-30)
    A copepod parasite, Lernanthropus indicus (Pillai, 1967), was recorded first time from ‎the marine fish Otolithes ruber (Bloch & Schneider 1801) and Sphyraena putnamae ‎‎(Jordan & Seale 1905) captured from Karachi coast Pakistan. Lernanthropus indicus ‎‎(Pillai, 1967) is a rare species and was only reported from marine fishes of India, Iraq ‎and Egypt. This is the Fourth report on this species in the World and first report from ‎Pakistan.‎
  • Life-history traits of long whisker catfish Mystus gulio (Siluriformes: Bagridae) in the ‎coastal water (Maloncho river) of southern Bangladesh.

    Rahman‎, Obaidur; Hossain‎, Md. Yeamin; Islam‎, Md. Akhtarul; Rahman‎, Md. Ataur; Khatun‎, Dalia; Parvin‎, Most. Farida; Sarmin‎, Most. Shakila; Tanjin, Sumaya; Rahman, Md. Ashekur; Mawa, Zannatul; et al. (2020)
    This analysis illustrates the life history traits of Long whisker, Mystus gulio (Hamilton, ‎‎1822) including sex ratio, length-weight (LWRs) and length-length relationships (LLRs), ‎condition factors (KA, KF, KR), relative weight (WR) and form factor (a3.0), empirical based ‎size at first sexual maturity length (Lm) and natural mortality (MW, year-1). Total of 407 ‎individuals were scarcely collected from January-December 2017 using different fishing ‎gears. The sex ratio (M/F) was calculated as 1:1.26 (p<0.05). The overall sex ratio did not ‎differ significantly from the expected 1:1(p>0.05). The minimum-maximum total length ‎and body weight were observed as 5.20-15.50 cm and 2.11-33.60g for male, 5.20-17.50 ‎cm and 1.25-57.12g for female. All LWRs were very significant with all coefficients of ‎determination (r2)>0.967. The allometric coefficient indicated negative allometric growth ‎in male (b<3.0), positive allometric growth in female and also in combined (b>3.0). All ‎LLRs were significant with r2 values >0.965. The KF indicated the best condition of this ‎species for their well-being. The WR was not significantly diverse from 100 for males (p = ‎‎0.552) and females (p = 0.249), which indicate suitable condition for habitat. The a3.0 ‎were 0.0103 and 0.0108, and the Lm were 9.13 and 10.46 cm in total length for male and ‎female, respectively. Moreover, MW was 1.16 year-1 for male and 1.02 year-1 for female. ‎The results will be operative for the sustainable conservation of M. gulio in Bangladeshi ‎coastal waters and also nearby countries.‎
  • Some observations on the mass mortality of fish at Ormara (east bay), Balochistan in ‎October 2016‎.

    Moazzam, Muhammad (2020-12-31)
    Mass mortality of fish and shellfish species was recorded from Ormara (East Bay) in ‎October 2016. Initially a few dead fishes were observed to be floating in the open sea in ‎the East Bay area. With the passage of time, mass mortality was observed on the south-‎western part of the East Bay and heaps of fish were found floating in the area. This ‎event of mass mortality was only confined to the Oramara (East Bay) and not spread to ‎other parts of Oramara coast. In order to determine the dynamic of the fish mortality ‎and its spread in the area, sampling of the water of the area was collected on regular ‎intervals. It was observed that Noctiluca scintillans (Macartney) Kofoid & Swezy, 1921 ‎was present in extremely large numbers (highest recorded concentration 13 cells/ml) ‎which led to depletion of oxygen in the area resulting in mortality of large number of ‎fishes. In this fish kill demersal (bottom dwelling) as well as pelagic species (surface ‎dwelling) were found dead in the area in large numbers. Groupers (Epinephelus spp.), ‎Chinese pomfrets (Pampus chinensis), mullets, shrimp (Penaeus spp.) and crabs ‎‎(Portunus spp.) were dominated in the dead fishes and shellfishes. Oxygen depletion was ‎observed to confine to south-western part of the Ormara Bay where highest number of ‎dead fishes were observed. The phenomenon of mortality of fishes continued for 8 days ‎whereas normal condition started prevailing in 15 days and no mortality was observed ‎after 20 days since the start of the mortality phenomenon.‎
  • Cross-shelf phytoplankton dynamics in the northeastern Levantine ‎Basin.

    Uysal, Zahit (2020-12-31)
    A time series sampling program at monthly intervals was carried out at three stations ‎across the shelf in the northeastern Levantine basin to collect phytoplankton samples ‎and associated physical (temperature, salinity, secchi disc depth) variables over a year. ‎Quality and quantity of phytoplankton varied significantly across the shelf in time. Total ‎‎71 diatom, 40 dinoflagellate, 4 silicoflagellate and 17 coccolithophore species have been ‎identified from the study area. Diatoms’ contribution to total phytoplankton abundance ‎was maximal during autumn and spring in the nearshore and only during spring in the ‎mid shelf. Coccolithophores formed the dominant group almost throughout the year ‎except May and June in the offshore. Dinoflagellates formed the least abundant group in ‎the shelf over the year. Phytoplankton species have been found the most abundant and ‎diverse during spring when the river runoff to the basin was maximal. In general, a ‎decreasing trend in phytoplankton abundance towards offshore was prominent. ‎Phytoplankton has been found most abundant in the entire shelf during spring and early ‎summer reaching a peak level of 2.7 x 106 cells/l during May in the shallowest station. A ‎huge difference in quantity was observed in phytoplankton contents of the nearshore ‎and offshore waters during summer. Multivariate analyses have shown formation of ‎distinct seasonal phytoplankton assemblages throughout the year. Based on Spearman’s ‎rank correlation analysis, a highly significant negative correlation (n=35, rs= -.587, P < ‎‎0.01) was observed between phytoplankton abundance and surface salinity. ‎Superimposed surface temperatures seemed to better illustrate seasonal clusters relative ‎to surface salinity plots.‎
  • Heavy metal accumulation in sea cucumber ‎Actinopyga mauritiana (Echinodermata-‎‎Holothuroidea) from Cape Monze Beach Karachi, ‎Pakistan‎.

    Ahmed, Quratulan; Benzer, Semra; Ali, Qadeer Mohammad (2020-12-31)
    In the present study sea cucumber Actinopyga mauritiana, water and sediment samples ‎collected during September to December 2018. Six heavy metals (Fe, Cu, Mn, Zn, Pb, ‎and Cd) were analyzed in tissues (muscles, tentacles and guts), water and sediment by ‎atomic absorption spectrophotometer (AAS). The average measured levels of heavy ‎metals Fe, Cu, Mn, Zn, Pb and Cd in A. mauritiana muscle, tentacle and gut was 42.20 ± ‎‎9.47, 3.14 ± 0.48, 0.38 ± 0.22, 11.42 ± 4.34, 0.03 ± 0.00 and 0.02 ± 0.00; 36.90 ± 8.14, ‎‎3.22 ± 0.60, 0.40 ± 0.27, 10.50 ± 1.70, 0.04 ± 0.05 and 0.03 ± 0.02; 21.54 ± 5.06, 2.32 ± ‎‎0.66, 0.53 ± 0.16, 13.13 ± 2.90, 0.02 ± 0.02 and 0.02 ± 0.01 μg g−1 respectively. It is ‎useful to monitor all metal accumulation in the future.‎
  • First record of Leucothoe spinicarpus (Amphipoda: Leucothoidae) parasite within the ‎Aplysia (varria) cornigera from Pakistan.

    Ghory‎, Farhana S.; Ali, Qadeer Mohammad; Mubarak, Shumaila (2020-12-31)
    A parasitic species of Leucothoe spinicarpus (Abildgaard, 1789) occurred on the ‎ctenidium of Aplysia (Varria) cornigera Sowerby, 1869. The current study describes ‎taxonomic details of the parasitic species (Leucothoe spinicarpus). This is the first record ‎from Pakistan.‎
  • Ligula intestinalis (L., 1758) infection of ‎euryhaline fish the sand smelt Atherina ‎boyeri ‎Risso, 1810‎.

    Benzer, Semra (2020-06-30)
    Ligula intestinalis was found during the parasitological investigations of Atherina boyeri ‎specimens collected from Hirfanlı Reservoir, Turkey. It was found that 0.004% of all ‎individuals were infected by L. intestinalis including 2 female (0.0011% of all ‎individuals) and 5 male (0.0028% of all individuals). It was determined that the length ‎weight relationship equivalents of infected individuals with population differed from ‎those of non-infected individuals. The b value of the infected individuals was found to ‎be lower than the b value of the non-infected individuals. It is thought that the results ‎obtained in this study will be beneficial in preserving and improving the ecological ‎potential of the water system.‎
  • Heavy metal levels in elongate sole (Solea ‎elongata Day, 1877) from the Korangi ‎Fish ‎Harbour, Karachi, Pakistan.‎

    Yousuf‎, Farzana; Benzer‎, Semra; Ahmed, Quratulan (2020-06-30)
    In this study, fish samples collected from Elongate Sole (Solea elongata Day, 1877) ‎caught on the Korangi Fish Harbour in 2018 (South-west Monsoon and North-east ‎Monsoon) were analysed to determine concentrations of heavy metals: Fe, Zn, Cu, Pb, ‎Mn and Cd by an atomic absorption spectrophotometer, expressed per unit of dry weight ‎of each sample. The average measured level of Fe, Zn, Cu, Pb, Mn and Cd for Solea ‎elongata was 38.716±11.321 μg g−1, 16.638±3.344 μg g−1, 1.067±0.404 μg g−1, ‎‎0.022±0.043 μg g−1, 0.273±0.100 μg g−1 and 0.022±0.010 μg g−1, respectively. Although ‎the contamination values obtained from Solea elongata are below the limits, it is ‎important to follow the metal accumulation values.‎
  • Amino acid content in muscle tissue of the brown ‎meagre, Sciaena umbra Linnaeus, ‎‎1758 (Pisces: ‎Sciaenidae) as candidate species for aquaculture ‎in the Black Sea, ‎Turkey.

    Bilgin, Özlem; Maviş, Murat Emrah; Göksu-Gürsu, Gökçe (2020-06-30)
    In order to understand the nutritive quality focusing on amino acid profiles in the muscle ‎of the brown meagre, Sciaena umbra, and to evaluate the potential of the species as a ‎diet source for both human consumption and as candidate species for aquaculture, the ‎main amino acid components in the muscle of this species were analyzed. Amino acid ‎compositions were determined with the LC-MS/MS (Liquid Chromatography Tandem ‎Mass Spectrometer) instrument. Although a total of thirty-nine amino acids were ‎detected / searched by LC-MS/MS instrument, only twenty-four amino acid values were ‎determined. Seven of these amino acids are essential amino acids (EAAs), two are semi-‎essential amino acids (SEAAs) and fifteen are non-essential amino acids (NEAAs). The ‎most abundant amino acids in brown meagre meat were found as glutamic acid ‎‎(13.88%), lysine (10.43%), aspartic acid (9.62%), leucine (8.32%), and glycine (6.87%), ‎respectively. These five amino acids accounted for more than 49% of the total amount ‎of amino acids. The levels of the total amino acids (ΣAA = 24.17 g/100g), total essential ‎amino acids (ΣEAA = 9.42 g/100g), total non-essential amino acids (ΣNEAA = 12.39 ‎g/100g), total semi-essential amino acids (ΣSEAA = 2.36 g/100g) for brown meagre in the ‎Black Sea were higher than those reported in the other areas. This study shows that the ‎brown meagre has high nutritional qualities and the results are also presented as an ‎important criterion for obtaining information on amino acid nutritional requirements for ‎aquaculture and healthy human food source for dietitians.‎
  • A primary study on the bioaccumulation of ‎metals in Stereoderma kirschbergi (Heller, ‎‎1868) ‎from Sinop coasts of the southern Black Sea‎.

    Bat‎, Levent; Arici, Elif; Öztekin, Aysah; Şahin, Fatih (2020-06-30)
    The amounts of toxic metals (Pb, Hg and Cd) in tissues of Stereoderma kirschbergi in the ‎Sinop coasts of the south of the Black Sea were measured for the first time. Toxic metal ‎analyses were made by the Inductively Coupled Plasma - Mass Spectrometer. The ‎general tendency in all metal concentrations in both sediment and sea cucumber samples ‎were Pb>Hg>Cd. The results demonstrated that the toxic metal concentrations in ‎sediments were higher than organisms. Pb values in the sediment and sea cucumber were ‎higher than Hg and Cd. The bio-sediment accumulation factors for Cd, Hg and Pb were ‎lower than 1. S. kirschbergi is considered as a de-concentrator.‎
  • Preliminary studies on induced asexual ‎reproduction in Holothuria atra and Holothuria ‎pardalis under laboratory ‎conditions.

    Ahmed, Quratulan; Ali, Qadeer Mohammad (2020-06-30)
    Asexual reproduction was observed in H. atra and H. pardalis during 20th November ‎‎2019 to 20th February 2020. Asexual reproduction is a common phenomena in sea ‎cucumbers (class Holothuroidea) and organisms are capable of regenerating completely ‎or partially after fission and evisceration. The present research is a first attempt/trial on ‎induce asexual reproduction in H.atra and H. pardalis under the laboratory conditions in ‎Pakistan. The induced asexual reproduction is of high significance in aquaculture of ‎holothuria and could lead towards commercial production. During the last two decades ‎sea cucumber fishing showed a trend of overexploitation because they are easy to catch ‎besides high market demand. Many countries including Australia, Papua New Guinea, ‎Mauritius and Venezuela have imposed prohibition on sea cucumber fishing due to ‎depletion of population in wild. The findings from present research will be substantive ‎addition to the knowledge in the field of aquaculture and will be valuable to marine ‎scientist and aquaculturist in their future research.‎
  • Notes on the first record of Tridacna noae (Röding, 1798) (Cardiidae: Tridacninae) in Palawan, Philippines.

    Ecube, Krizia Merly A; Villanueva, Elmer G; Dolorosa, Roger G; Cabaitan, Patrick C (2019)
    The first record of Tridacna noae in the province of Palawan, Philippines was documented on June 21, 2018, at Paraiso Resort, Albaguen Island, Port Barton in the municipality of San Vicente. The single specimen measured 4.5 cm in shell length and was partly buried in a massive coral rock. The mantle edge of the species is lined with teardrop-like patches with white margins. This recent finding is an addition to the seven previously reported giant clam species in Palawan and confirms new sighting location in the existing geographic range. The habitat of the species is a semi-protected cove, about 1 m deep at high tide, with massive coral rocks generally covered with the seaweed Sargassum spp. Potential threats include the shading effects of macro algae and the constant presence of tourists visiting the resort who might accidentally step on the clams. Buoy demarcation to exclude the area from disturbance may help protect the species and other boring giant clam species. Continued assessment may provide information on the status of T. noae in Palawan and in other parts of the country.

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