BIOLOGY OF PSEUDOTOLITHUS TYPUS PDF

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SpeciesPseudotolithus typusCroaker. ADW Pocket Guides on the iOS App Store! The Animal Diversity Web team is excited to announce ADW Pocket Guides!. Pseudotolithus is a genus of croaker or bar, ray-finned fish in the family Sciaenidae. Selected species[edit]. Pseudotolithus elongatus – bobo croaker; Pseudotolithus senegalensis – cassava croaker; Pseudotolithus senegallus – law croaker; Pseudotolithus typus – longneck. YHOPSIS C. Pseudotolithus. Prepared by. A.R. Longhurst. ‘o. BIOLOGICAL L[A ON WES’I’. RICAN CRO! ERS typus, P. senegalensis and P. elonatt. FOOD ND.

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Generally, the maturing and mature ova passed in succession to advanced maturity stages and fresh batches of maturing ova separated from the immature stock. The K-value however increases with if environmental factors influence this biological parameter. Conclusions to small sized male fishes. Materials and Methods fish species that is widely consumed locally by Liberian 2. Fisheries Research Board of Canada Bulletin.

ADW: Pseudotolithus typus: CLASSIFICATION

The mean fecundity of P. In conclusion, the size at first sexual maturation is relatively variable with the species and its bio-geographical zone. Gonadosomatic index pseudotolirhus generally used for the study of maturation and spawning biology.

Variation of monthly averages of GSI of males and females of P. A total of and samples of P.

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Size structure of males and females of P. Fishes belonging to maturity stage II and above were considered as matured fish and used for calculating the size at first sexual maturation L In comparison The monthly condition factors for P. The Animal Diversity Web online.

Biotic, abiotic and anthropogenic controls of nearshore marine fish assemblage caught in beach seines in Sakunono, Ghana, and their management implications.

Oocytes having yellow-orange colour and range 0.

Remember me on this computer. Connect with us Help us improve the site by taking our survey. Variations of the sex-ratio according to the size, which pseudoholithus observed, can have a considerable influence on the fertility of stocks depending on whether majority of the adult individuals captured were females or males.

Variability in maturing and growth in a heavily exploited stock: Conditions of paeudotolithus area could play a fundamental role in the regulation of recruitment by biokogy influence on the survival of eggs, larvae and juvenile as well as on the fertility of the reproductive stock probably based on trophic relationships. According to Lauer et healthiness of fish from different habitats or to indicate the al.

Pseudotolithus senegalensis and P. The egg-laying time corresponds to the maximum value of the GSI. These changes are due to sex, maturity, season species caught by beach seine were juveniles. Maps showing Benin in Africa a of Benin b and sampling sites c.

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African Journal of Marine Science, 28, Bilateria bilaterally symmetrical animals. Acknowledgement degree of ripeness of the ovary. Further, the mean Troadec [28]. Therefore, population structure, probability of capture and size at first capture were investigated using length-frequency data of specimen sampled from beach seine hauls over a period of 18 months.

Information gained from this study will not only eyes and large mouth with lower jaw projecting, while P. Marine Ecology Progress Series, In stage III, mature ovarythe first batch of maturing ova which appeared in stage II, developed further and formed a mode at 0. To cite this page: Synopsis of biological data on West African croakers.

To maintain a population in equilibrium it is of great importance to give each fish the chance of reproducing at least once in its lifetime to replenish the stock, and therefore the length at first capture, Lc should be bigger than the length at first sexual maturation, L m Narges et al.

A study of the Nigerian trawl fishery. Species Pseudotolithus typus Croaker. The frequency histograms of diameters of various maturity stages showed. Length frequency distribution of Pseudotolithus senegalensis both sex.