An interactive approach to macro model estimation

Scheffers, B. C.; Bruijn, J. W. de; Berkhout, A. J.

doi:10.3997/2214-4609.201411039

Cited by 1 publication

(7 citation statements)

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“…The evolution of sexual maturity stages of Ethmalosa fimbriata has not been the subject of many studies. Scheffers et al (1972), contrary to our results; showed a predominance of immature during the period from September to November, while December to June the mature females are superior.…”

Section: Evolution Of Sexual Maturity Stagescontrasting

confidence: 99%

“…Fishing of Ethmalosa fimbriata is more intense at the Saloum estuary than the sea (DPM, 2010), this can be one of the causes of this difference in size at first maturity between these two environments. These results corroborated with those reported for the same species by Scheffers et al (1972) in Senegal, Scheffers (1976) Gambia, Salzen (1958) Sierra Leone ( Table 2). The works of Albaret and Dominique (1982) and Albaret and Gerlotto (1976) in Ivory Coast, and Fagade Olanyan (1972) in Nigeria and N'goran (1991) Ivory Coast showed that males reach sexual maturity first.…”

Section: Sexual Maturitysupporting

confidence: 91%

“…In estuary, the sex ratio expressed as a percentage of male is equal to 46% while at sea it is 42 %.These results are in agreement with those of Gerlotto (1979) in Côte d'Ivoire; Scheffers et al (1976) in The Gambia; Fagade and Olanyan (1972 ) in Nigeria and Olsen and Lefevere (1966) in Nigeria . However, the results of Boely et al (1979) and Scheffers et al (1972) in Senegal; Olsen and Lefevre (1966) in the Niger Delta, as well as those of Salzen (1958) in Sierra Leone, showed a sex ratio in favor of males. The sex ratio in favor of females could be due to factors such as the movement for search of food and growth differential between the two sexes (Panfili et al 2004).…”

Section: Sex Ratiomentioning

confidence: 88%

“…However, the sizes at first maturity are low for both sexes. Diouf (1996) Senegal L50 = 16 cm L50 = 17 cm Scheffers et al (1972) Gambia -L50 = 18.5 cm Scheffers (1976) Sierra Leone L50 : 20 cm Salzen (1958) Ivory Coast L50 = 13 cm L50 = 14 cm Albaret and Gerlotto (1976) Ivory Coast L50 = 8.1 cm L50 = 8.4 cm Albaret and Charles-Dominique (1982) Nigeria L50 = 10 cm L50 = 14 cm Fagade and Olanyan (1972) 4.3 Reproduction Periods…”

Section: Sexual Maturitymentioning

confidence: 99%

“…Biology of Ethmalosa fimbriata has been the subject of previous studies in Senegal by Blanc (1951) and Boely Elwertowski (1970); Scheffers et al (1972); Scheffers (1973); Conand and Scheffers (1976), Diouf (1996); Panfili et al (2004). Its biology has also been studied in other West African countries (Gambia, Ivory Coast, Nigeria, Sierra Leone, Cameroon, Ghana, etc.).…”

Section: Introductionmentioning

confidence: 98%

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Reproductive Biology of Ethmalosa fimbriata (Bowdich) in Senegalese Coastal Waters

Faye

Sarr

Thiaw³

et al. 2014

JBLS

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Ethmalosa fimbriata is a very abundant species in marine and estuarine waters of Senegal. It is caught only by artisanal fisheries. Some aspects of its reproduction are studied in order to provide some contribution to a rational and sustainable management of the fishery. To evaluate the reproduction of Ethmalosa fimbriata, the sex ratio, the size at first maturity, the evolution of sexual maturity stages and the gonadosomatic index (GSI) were used. The results show that the sex ratio is 46% of males and 54% of females in the estuary while at sea it is 42% of males against 58% of females. Size at first maturity is 16.2 cm for males and 17.5 cm for females in the estuary, while at sea these sizes are respectively equal to 17.2 and 18.7 cm for females and males. The main breeding periods are during the cold season in the estuary and the hot season at sea. Ethmalosa fimbriata is a species with small eggs and high fecundity. The absolute and relative fecundity are higher in the estuary than at sea.

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Section: Evolution Of Sexual Maturity Stagescontrasting

confidence: 99%

Section: Sexual Maturitysupporting

confidence: 91%