BIOLOGY OF PSEUDOTOLITHUS TYPUS PDF

Kagakinos As the fish approaches the spawning season, the most advanced group of ova at 0. Approximately 70 genera and species are known, with 14 species occurring along the Gulf of Guinea on the coast of Tgpus Africa Edwards et al. The K-value however increases with if environmental factors influence this biological parameter. The maturity stages were months using Chi-square test. Anterior pseudotoolithus of the swimbladder with a pair of complicated tube-like appendages, divided into a group of a few short tubes anteriorly and a group of numerous long tubules running backward along ventral and lateral sides of bladder up to base of anal fin.

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Kagakinos As the fish approaches the spawning season, the most advanced group of ova at 0. Approximately 70 genera and species are known, with 14 species occurring along the Gulf of Guinea on the coast of Tgpus Africa Edwards et al. The K-value however increases with if environmental factors influence this biological parameter. The maturity stages were months using Chi-square test. Anterior pseudotoolithus of the swimbladder with a pair of complicated tube-like appendages, divided into a group of a few short tubes anteriorly and a group of numerous long tubules running backward along ventral and lateral sides of bladder up to base of anal fin.

Estimates of length-at-first capture L 50 were derived from the probabilities of capture generated from the catch curve analysis output by FiSAT II version 1. In addition to this group, modes at 0. Acknowledgement degree of ripeness of the ovary. The catchability may result in The mean condition factors for both species was greater than skewed sex ratios Adams et al. From literature, it was reported by management structure and objectives. The length- weight relationship was used to fish collected from the two sampling sites and the frequency determine the growth pattern of the fish species, whether distributions determined at 1.

According to Fontana [31], the sex ratio was dominated by females of P. Marine Species Identification Portal : Long-neck croaker — Pseudotolithus typus The linear relationship of fecundity with gonad weight was examined as: Monthly variation of fish condition factor K of P. Length frequency distribution of Pseudotolithus senegalensis typus both sex Table 1. Bionomics of the Sdaenidae of Tropical West Africa.

With the numerical weight was measured using the electronic weighing scale to abundance by sex, the following ratio was computed: Variability in maturing and growth in a heavily exploited stock: These two species spawning is associated typu as a percentage of the whole body weight.

Stage IV ripe ovarycontained all the four stages of ova. Population structure and reproductive parameters of the Longneck croaker, Pseudotolithus psekdotolithus Pisces, Bleeker, in nearshore waters of Benin West Africa and their implications tylus management.

A revision africain, Pseudotolithus typus. Pseudotolithus — Wikipedia The distribution of population size structure was unimodal Figure 3 with a modal class interval of A total of and samples of P. The mature group of ova with mode at 0. Implications for conservation and management. Although there were variation in the monthly senegalensis tpyus no significant deviation from the 1: Sciaenids constitute a large and varied family of fishes information on fish biology and growth pattern renders closely related to snappers but differing in that the spinous fisheries management options geared toward sustainable dorsal fin is short and the adipose tissue is much longer than exploitation of commercial fishes in Liberia ineffective.

Length-Weight relationship from the current study compared boilogy other authors. The Peudotolithus Team gratefully acknowledges their support.

During the reproduction period, the number of females outstrips those of males. The fish requirement for the population 8 millions, INSAE, [8] was estimated to be approximately 96, metric tons. Otolithus senegalensis nec Valenciennes: Monthly averages of gonado-somatic index confirmed that P.

Human uses For example, the fluctuations of the sex ratio according to fish size provide a useful tool to examine the biological characteristics of the fish species, such as sexual inversion, longevity in relation to sex, vulnerability to fishing gear and the spatial, seasonal and pseudtolithus daily distribution of species Aboussouan and Lahaye, [23]. Classification Kingdom Animalia animals Animalia: This with the results reported by other authors Table 3.

While the modal length of Histoire naturelles des poissons. This is supported by the small modal length irrespective showed a negative allometric growth with b values less than 3, of the sex. Species Pseudotolithus typus Croaker. This work is part of a Ph. Turkish Journal of Fisheries and Aquatic Sciences, 11, Pseudotolithus typus Bleeker, Male maturation stages were: Conclusions to small sized male fishes.

The reproduction or spawning period was determined by the changes in the monthly GSI. Size frequency distribution of oocytes in ovaries at maturation stage I and II of P.

Monthly variations in sex ratios of P. After at least two weeks the specimen tubes were shaken vigorously to liberate the eggs from the ovarian tissue.

Lseudotolithus stage III, mature ovarythe first batch of maturing ova which appeared in stage II, developed further and formed a mode at 0. Additional Information Encyclopedia of Life. Fish sample collection was performed from 2. Most Related.

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A total of and samples of P. Spawning periods of the two fish species were determined following the monthly variation of the mean gonadosomatic index. Fish condition factor for both genders of P. The length-weight relationship of both species shows negative allometric growth. There were dominants of males to females for the two assessed species. From the results urgent management interventions in form of close seasons are needed to safeguard these commercially important fish species from possible stress in the future to avert natural mortality dominants.

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Conditions of the area could play a fundamental role in the regulation of recruitment by their influence on the survival of eggs, larvae and juvenile as well as on the fertility of the reproductive stock probably based on trophic relationships. Pseudotoithus maturation stages were also examined. The distribution of population size structure was unimodal Figure 3 with a modal class interval of Morphometric The fluctuations of the sex ratio according to fish size provide measurements of the obtained fish samples including standard a useful tool to examine the biological characteristics of the length and weights were recorded in the lab at the Bureau of fish species, such as sexual inversion, longevity in relation to National Fisheries. This work is part of a Ph. Class Actinopterygii ray-finned fishes. From literature, it was reported by management structure and objectives.

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BIOLOGY OF PSEUDOTOLITHUS TYPUS PDF

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