Recent Submissions

  • Fish diversity of the wild and aquaculture water bodies in Singida Region

    Bwathondi, P.O.J. (Tanzania Fisheries Research Institute (TAFIRI)Dar es Salaam, Tanzania, 2002)
    Tanzania Fisheries Research Institute being currently the only fisheries research institute in Tanzania has sole responsibility of marking the presence and distribution of fish species in the country. This work is expected to be completed by the year 2005. In order that this work can be accomplished, both published works and field observations(including geographical location using GPS) have to be compiled. Since the institute has centers in all the Great Lakes and one along the Indian Ocean coast, it is expected that field observations and identifications will be obtained and incorporated into the document to be produced by 2005. (PDF contains 15 pages)
  • National report of IFMP catch assessment survey (CAS) for August 2005

    Mkusu, B.S.; Rwekaza, C.T.; Lyimo, E.; Tanzania Fisheries Research Institute (TAFIRI), Mwanza; Fisheries Department, Regional Fisheries Office, Mwanza; Fisheries Division, Headquarters, Dar es Salaam (Tanzania Fisheries Research InstituteMwanza, Tanzania, 2005)
    The first comprehensive CAS was carried out during the month of July 2005 This is the second report of CAS for the month of August 2005 following the July report. The design and methodology followed was the same as in July. This report highlights the results obtained in August catch assessment survey. The report gives estimates of mean catch rates in Kgs./boat/day, total catches in M.tons and values of the catch by species. The total catch for August was 31,633.0 M. tons. This is lower when compared with the July catch which was 39,745.1 M. tons. In August the catch composed of Dagaa (45%), Nile perch (33%), Haplochromines (16%), Tilapiines (5%) and all other species combined (1%). (PDF contains 14 pages)
  • New record of giant devil ray (Chondrichthyes: Myliobatidae) from Oran Bay (Western Meditteranean Sea)

    Hussein, Kais Boumedienne; Bensahla Talet, Lotfi (2019-06-01)
    The present paper reports a new record of Giant devil ray Mobula mobular (Bonnaterre, 1788)from western Algerian waters that is encountered for the first time in that coast since its firstdescription in 1901 and last observation in late 80’s. This elasmobranch is categorized asendangered on the IUCN Red List (Endangered A2d ver 3.1) and is likely to be the rarest of the ninespecies of Mobula genus. Occasionally it is captured in Mediterranean Sea by purse seines,bottom and pelagic trawls, pelagic nets, bottom longlines, drifters and harpoons. The specimenstranded in “la Madrague Beach” in Western Algerian coasts. Its disc length was measuring108.96 cm and disc width was 226.02 cm. This Myliobatidae is rarely seen with daily landed fish atOran fishery. Up to date no explicit reason can be given for the strand of M. mobular but ghostfishing and important maritime traffic stay the most plausible cause of this incident.
  • Reproductive biology of Pagellus acarne (Risso, 1927) (Teleostei: Sparidae) off western Algerian waters (Western Mediterranean)

    Bensahla Talet, Lotfi; Gherram, Malika; Dalouche, Fatiha; Bensahla Talet, Ahmed; Boutiba, Zitouni (2017)
    The reproduction of Pagellus acarne caught in Oran Bay was studied. The samples used were sorted monthlyfrom commercial catches of coastal trawlers operating in this area from April 2008 to July 2009. The overall sex ratio wasin favor of females 1:1.27 and length frequency distribution according to sex revealed that the females were highlyrepresentative beyond 20.5 cm of total length presuming a sexual inversion already described for this sparidae. Theestimated lengths at maturity (Lm) were 12.8 cm for females and 16.0 cm for males. Two spawning periods were made outby the follow-up of the gonado and hepato somatic indexes: a spring period from April to June with a peak in May and anautumnal period, between November and January with a peak in December. The closed season in Oran Bay extends from 1stMay to 31th August, which is to our opinion insufficient to safeguard the renewal of the resource and its spawning stock.
  • On the fecundity of the seabream, Pagellus acarne (Risso, 1827) of the western Mediterranean Sea, Algerian coasts

    Bensahla Talet, Lotfi; Mouffok, Salim; Bensahla Talet, Ahmed; Boutiba, Zitouni (2013)
    The fecundity of the Seabream from the western Mediterranean (Algerian coast) was assessed by the volumetric methodusing 22 ovaries from females between 169 and 263 mm total length (206.62 ± 19.93). Estimates of total potential annualfecundity varied between 19875 and 49125 oocytes per female (29448.86 ± 8198.12). Relationships between total potentialfecundity (F) and total length (Lt), total weight (Wt), gonad weight (Wg) were established using the multiplicative regressionmodel and a significant correlation was found (ANOVA: P‹0.01).
  • Age, growth and mortality of the common carp (Cyprinus carpio) population in Merdja Sidi Abed Dam, Algeria

    Bensahla Talet, Lotfi; Bensahla Talet, Ahmed (2019)
    We tried to estimate age, growth parameters, condition factor, length-weight relationship and mortality rates (Z, M, and F) of the common carp in Merdja Sidi Abed dam. Cyprinus carpio specimens were captured by long line between April and June 2013 in Merdjea Sidi abed. 220 individuals were collected and weights ranged between 265.5 and 620.3 g while the total length ranged between 26.3 and 35.6 cm. Length-converted catch curve was used to estimate total annual instantaneous mortality rates (Z), natural mortality was calculated using Pauly formula [ln(M) = -0.0152 - 0.279 ln(L∞) + 0.6543 ln(K) + 0.463 ln(T)]. Recruitment patterns were determined from the routine implemented in FISAT II. For all individuals (n = 220) of the common carp, the relationship between total length and body weight was: W = 0.0384 L2.70 (r2 = 0.906) for females and W = 0.0467 L2.653 (r2 = 0.976) for males a minor allometry was found for this species, mean condition factor K was estimated at 1.41. The maximum value of recruitment was recorded in March-April period with 19.56 and 15.20% respectively. The Battacharya method was used to estimate age of individuals that was comprised between 1 and years 3. The equation of Von Bertalanffy growth was: L = 36.75 [1-e-0.46 (t + 0.33)] for all the population. Total mortality (Z), natural mortality (M) and fishing mortality (F) were as follows: Z = 1.08, M = 0.82, F = 0.26 yr-1 while exploitation ratio (E) was evaluated at 0.24 indicating an under exploitation of this local resource.
  • Weight-length relationships of seven fish species (Teleostei: Sparidae, Mullidae, Carangidae) of Western Mediterranean Sea (Oran Bay, Algeria)

    Bensahla Talet, Lotfi; Gherram, Malika; Bensahla Talet, Ahmed (2017)
    No information currently exists on the weight-length relationships of Sparidae:Axillary seabream Pagellus acarne (Risso, 1827), bogue Boops boops (Linnaeus, 1758);Mullidae: Red mullet Mullus barbatus (Linnaeus, 1758), surmulet Mullus surmuletus (Linnaeus,1758) and Carangidae: Atlantic horse mackerel Trachurus trachurus (Linnaeus,1758),Mediterranean horse mackerel Trachurus mediterraneus (Steindachner 1863), Blue jackmackerel Trachurus picturatus (Bowdich 1825), seven commercial fish species of Oran Bay inWestern Mediterranean Sea. Data are presented for the first time for that region of theMediterranean Sea to contribute and help comparative growth studies. Samples were collectedfrom commercial catches at Oran Bay fisheries in Algeria. The values of the slope b in the lengthweightrelationship, W=aLb ranged from 2.841 to 3.296. The coefficients of correlation r2 werecomprised between 0.85 and 0.97. “a” and “b” parameters were compared with other fishing sitesfor the same fish species with Froese plot [Log a=ƒ(b)].
  • First record of invasive green algae Caulerpa racemosa var. cylindracea in Oran Bay (Western Algeria)

    Hussein, Kais Boumediene; Bensahla Talet, Lotfi (NISCAIR-CSIR, India, 2019-03)
    Caulerpa racemosa var. cylindracea (hereafter Caulerpa cylindracea) was first reported in the Mediterranean Sea in1926 1 in Tunisian waters and then in Tripoli harbor in Libya, in 1990. In late 90s it invaded the southern shore of Europe. InAlgeria, this invasive species was reported for the first time in 20072, five years after it appeared about 450 km from the firstsite in the eastern part of the Oranian littoral. This situation required widespread monitoring of this invasive species all along124 km of the coastline. More than 10 stations were patrolled and monitored since then, studied by scuba diving between thesurface and 30 m depth.The observations devoted to the distribution of Caulerpa cylindracea in Oran showed that specimens presented the sameappearance with irregularly entangled branched stolons attached to the substrate by colorless rhizoids from which the nameof the variety cylindracea was derived. Chronologically, the invasion direction seems to move from the bottom to the surfacewith an orientation from east to west, in the Oranian coastline. In situ observations confirmed high propagation speed ofCaulerpe in the Oranian coastline where invasions were signaled in several stations. The seaweed was observed for the firsttime in late 2011 and early 2012 (pers.obs) in Arzew Gulf (Cap Carbon) at the extreme east of the littoral, where the firstfronds were noticed. Then it extended geographically to the center of the coastline, in Kristel, early 2013. In 2014, it wasobserved in Ain Turc and Cap Falcon. In 2015, it was observed in the western shoreline near Bousfer beach and in 2016 itreached the “Plane” island (Paloma).This alien species was encountered at depths ranging from a few centimeters in microcuvettes up to 37 m, on varioussubstrates (hard, sandy, muddy) between marine phanerogams rhizomes and, also between the lower mid-littoral and infralittoralssuperior algae, with Posidonia oceanica herbarium. The study suggested a strong need for scientific monitoring andmanagement program, using optimized methodslike biological control or manual eradication for controlling the invasion.
  • Fecundity of the blotched picarel, Spicara maena (Linnaeus, 1758) from Oran Bay (Western Mediterranean Sea)

    Dalouche, Fatiha; Bensahla Talet, Lotfi; Bensahla Talet, Ahmed; Abi Ayad, Sidi Mohamed El Amine (2019)
    The fecundity of the blotched picarel Spicara maena from the western Mediterranean (Oran Bay) was assessed by the volumetric method. Total length (TL) of studied females varied between 91 and 140 mm (mean ± SD: 111.9 ± 10.6 mm). Estimates of total potential annual fecundity varied from 16,750 to 28,125 oocytes per individual (mean ± SD: 21,404.7± 2,698.8). Relationships between total potential fecundity (F) and TL, total weight, gonad weight were established using the multiplicative regression model and a high significant correlation was found in all the cases.
  • Acrosymphyton purpuriferum (J. Agardh) Sjostedt et Balliella cladoderma (Zanardini) Athanasiadis, deux nouvelles espèces d’algues benthiques de la Méditerranée marocaine

    Riadi, H.; Salhi, G.; Bouksir, H.; Moussa, H.; Hassoun, M. (2014)
    The authors report two new species of benthic algae from the Mediterranean sea of Morocco : Acrosymphyton purpuriferum (J. Agardh) Sjostedt (Acrosymphytaceae, Rhodophyta) and Balliella cladoderma (Zanardini) Athanasiadis. The geographical distribution,description and illustration of macroscopic and microscopic characters and ecological characteristics of these species are presented.
  • Fisheries annual report for the year ending 1966

    Beatty, D.M.F. (Department of Game and Fisheries, Republic of ZambiaChilanga, Zambia, 1967-02)
    The Chief Fisheries Officer's Annual Report of 1965 showed then that there had been an increase in the volume of work of the Fisheries Department. This increase continued and accelerated during 1966. The Transitional Development Plan was successfully completed on schedule, with the exception of two items which had been almost finished by the end of the year, and the Four Year Development Plan was introduced; by the end of the year all officers of the Department were fully engaged in its implementation.
  • The zooplankton species composition and abundance in Ogun River, Abeokuta, Ogun State, southwestern Nigeria

    Dimowo, B.O. (2013)
    Investigation on the species composition and abundance of zooplankton in Ogun River, Abeokuta, Ogun state, Southwestern Nigeria was carried out for a period of seven months (December, 2011-June, 2012), Using hand trawling method, 55 µm mesh size plankton net was trawled horizontally ten times to capture zooplankton. The zooplankton samples were put into properly labeled plastic containers and preserved in 4% formalin solution. A total of sixteen genera from five taxonomic groups were recorded from Ogun River. Cladocera predominated both in terms of species composition and abundance. Five species of Cladocera was recorded consisting of 31.25%. Protozoa and Rotifera recorded four species each consisting of 25%. Copepoda recorded two species consisting of 12.5%, and Ostracoda with one species consisting of 6.25%. The low nature of zooplankton abundance and species composition observed in this study must have been caused by the polluted nature of the water due to the anthropogenic activities carried out around its shores The dominance of Cladocera in this river is similar to findings from River Echara and River Imo, Southeastern Nigeria.
  • Monthly spatial occurrence of phytoplankton and zooplankton in River Ogun, Abeokuta, Ogun State, southwest Nigeria

    Dimowo, B.O. (2013)
    The aim of this study was to investigate the monthly spatial occurrence of phytoplankton and zooplankton in River Ogun, Abeokuta, Southwest Nigeria. This was carried out for seven months between December, 2011 and June, 2012 in 4 stations. A total of 41 species of phytoplankton and 16 zooplankton species from 5 classes respectively were recorded. Zooplankton was dominated by Cladocera throughout the study period while phytoplankton was dominated by blue green algae (Cyanophyta or Cyanobacteria). The dominance of Cyanophyta in this river is similar to findings by Sekadende and co-workers, Ogato, Deng and co-worker, and Shakila and co-worker. The dominance of Cladocera in this river is similar to findings by Ude and co-workers, and Ogbuagu and co-worker.
  • The phytoplankton species composition and abundance of Ogun River, Abeokuta, southwestern Nigeria

    Dimowo, B.O. (2013)
    The phytoplankton species composition and abundance in Ogun River, Ogun state, Southwest Nigeria was studied for a period of seven months (December, 2011 - June, 2012), a total of forty-one genera belonging to five taxonomic groups were recorded from Ogun River. The phytoplankton species composition was surpassed by Chrysophyta with 15 species consisting of 36.6% followed by Chlorophyta with 14 consisting of 34.1%. This was followed by Cyanophyta (7 species) consisting of 17.1%, Euglenophyta with 3 species consisting of 7.3% and Pyrrophyta with 2 species consisting 4.92%. Cyanophyta was the highest in abundance consisting of 41% while the lowest in abundance was Pyrrophyta consisting of 1.5%. The low nature of phytoplankton abundance and diversity observed in this study must have been caused by the polluted nature of the water due to the anthropogenic activities carried out around its shores The dominance of Cyanophyta in this river is similar to findings from Lake Victoria, Lake Bishoftu, Lake Chaohu and the temple pond of Thirupour.
  • Assessment of some physico-chemical parameters of River Ogun (Abeokuta, Ogun State, southwestern Nigeria) in comparison with national and international standards

    Dimowo, B.O. (2013)
    This study assessed the physico-chemical quality of River Ogun, Abeokuta, Ogun state, Southwestern Nigeria. Four locations were chosen spatially along the water course to reflect a consideration of all possible human activities that are capable of changing the quality of river water. The water samples were collected monthly for seven consecutive months (December 2011 – June 2012) at the four sampling stations. pH, air temperature (℃), water temperature (℃), conductivity (µs/cm) and total dissolved solids (mg/L) were conducted in-situ with the use of HANNA Combo pH and EC multi meter Hi 98129 and Mercury-in-glass thermometer while dissolved oxygen (mg/L), nitrate (mg/L), phosphate (mg/L), alkalinity (mg/L) and hardness (mg/L) were determined ex-situ using standard methods. Results showed that dissolved oxygen, hydrogen ion concentration, total hardness and nitrate were above the maximum permissible limit of National Administration for Food, Drugs and Control (NAFDAC), Standard Organization of Nigeria (SON), Federal Environmental Protection Agency (FEPA), United States Environmental Protection Agency (USEPA), European Union (EU) and World Health Organization (WHO) for drinking water during certain months of the study period. Results also showed that water temperature and conductivity were within the permissible limits of all the standards excluding FEPA. However, total dissolved solids and alkalinity were within the permissible limits of all the standards. Adejuwon and Adelakun, (2012) also reported similar findings on Rivers Lala, Yobo and Agodo in Ewekoro local government area of Ogun state, Nigeria. Since most of the parameters measured were above the maximum permissible limits of the national and international standards, it can be concluded that the water is unfit for domestic uses, drinking and aquacultural purposes and therefore needs to be treated if it is to be used at all. The low dissolved oxygen values for the first four months was too low i.e. < 5 mg/L. This is most likely as a result of the amount of effluents discharged into the river. To prevent mass extinction of aquatic organisms due to anoxic conditions, proper regulations should be implemented to reduce the organic load the river receives.
  • Swimming crab Callinectes amnicola (Decapoda-Portunidae) capture analysis of a lagoon with high continental influence (Aby Lagoon, Cote d'Ivoire, West Africa)

    Sankare, Yacouba; Konan, Kouadio Justin; Amalatchy, Ncho Jacqueline; Soro, Metongo Bernard (2014-04)
    The study describes the main causes of captures and productions decreasing of swimming crab Callinectes amnicola (Decapoda Portunidae) in Aby lagoon complex. For that, docks of two Sub Prefectures of Adiaké and Assini-Mafia respectively including the villages of Adiaké, Anga, Assomlan, Epleman, Aby and Man-Man, M'Bratty, Assini-Ngouankro and Assini-Mafia were studied from 2006 to 2009 and completed with previous results obtained from 1988 to 2005. Field investigators were identified by site/village and they recorded daily activities of fishermen (number of effective fishermen, number of gears and area of fishing, duration of fishing, types and quantity of bait) and landing of swimming crabs. During recent period of the study, total production decreased from 3742 tons in 2006 to 1500 tons in 2009. Matrix correlations and correlation analysis indicated that this downward trend was due to the increase of the number of fishermen, number of fishing gear, the decrease in female crabs capture and degradation of the environment related to gradual closure of the Assini-Mafia channel. Despite this decline, total production in Aby lagoon remained high compared to the productions of some lagoons of the country and the region. Given the importance of fishing swimming crabs in Aby lagoon, since it concerns many young people and it is a source of income, stringent measures for sustainable and responsible management must be taken and implemented as part of a co-management plan involving all stakeholders to sustainably manage the resource

View more