Growth and mortality parameters of P. senegalensis and P. typus (Sciaenidae) in nearshore waters of Benin (West Africa) and their implications for management and conservation

Sossoukpe, Edmond; Nunoo, F.K.E.; Ofori-Danson, Patrick K.; Fiogbé, Emile Didier; Dankwa, Hederick R.

doi:10.1016/j.fishres.2012.08.020

Cited by 25 publications

(36 citation statements)

References 10 publications

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“…The estimated growth performance index from the study was slightly lower than estimates provided by other researchers (e.g. Sossoukpe et al, 2016). Potential reasons include computation procedure and the nature of the marine environment.…”

Section: Discussioncontrasting

confidence: 59%

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Amponsah¹,

Ofori-Danson²,

Nunoo³

et al. 2019

Greener J Agr Sci

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This study examined some population parameters of Sardinella maderensis landed along the eastern coast of Ghana, based on length-frequency data from June, 2014 to January 2015. Overall, 1401 samples of S. maderensis were measured for standard length and resultant data analysed with FiSAT II. The asymptotic length (L ∞) and growth rate (K) were 23.63 cm SL and 0.61 yr-1 respectively. The theoretical age at birth (t 0) and growth performance index (ϕ) were-0.284 yr-1 and 2.532 respectively. The recruitment pattern was continuous with two recruitment pulses. Total mortality rate (Z), natural mortality rate (M) and fishing mortality rate (F) were 2.96 yr-1 , 1.30 yr-1 and 1.63 yr-1 correspondingly. Fishing mortality rate surpassed the optimum fishing rate which showed that the assessed fish species is under high fishing pressure. The estimated exploitation rate (E curr) was 0.55, implying that the stock is over-exploitation. VPA outcome revealed higher harvesting rate on individuals with length between 10-11 cm. The spawning biomass which was below the 30% of unexploited biomass indicated future recruitment failure of the stock. As a result, urgent management interventions such as the application of biological reference points and mesh size regulations are urgently recommended for sustainable exploitation of Sardinella maderensis.

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Section: Discussioncontrasting

confidence: 59%

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Amponsah¹,

Ofori-Danson²,

Nunoo³

et al. 2019

Greener J Agr Sci

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“…On the other hand, (Sossoukpè E. et al, 2013;2016) found higher exploitation rate for Pseudotholithus senegalensis (E1 = 0.91; E2 = 0.82) and low exploitation rate for Sardinella maderensis (E = 0.33 per year) respectively in the nearshore waters of Benin. C. chrysurus is less exploited than those above-mentioned species because of its relatively low economic value but nevertheless it has a high fishing potential and a significant ecological value (Yañez-Arancibia and Sánchez-Gil, 1986;Flores-Coto and Sánchez-Ramírez, 1989;García-Tapia, 1991).…”

Section: Mortality Parameters (Z M and F)mentioning

confidence: 95%

Diagnosis, Growth and Exploitation Rate of the Sapater (Chloroscombrus chrysurus, Linnaeus 1766) Fishing by Purse Seine in the Nearshore Waters of Benin

Sossoukpe

Aissan

Adité

et al. 2017

IJAFAS

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Chloroscombrus chrysurus (Linnaeus 1766) is one of the most abundant species of Carangidae family occurring in the nearshore waters of Benin. To ascertain the exploitation level of this fishery resource, some demographic parameters of the species were studied for management and conservation measures. 605 specimens were collected randomly from commercial catches from August to November 2014. Morphometric, meristic and weight data were analyzed using SPSS software and the ELEFAN I routine from FiSAT. The population of C. chrysurus was not heterogeneous with a sex-ratio of 1.4:1 (p < 0.05; χ² = 312.485) and masculinity and femininity rates were 58.31% and 41.69% respectively. Length frequencies showed low percentage of small sized individuals and independent distribution of sex (r = 0.16, p < 0.05). The monthly variations of the gonad-somatic index (GSI) and the condition factor (Kc) showed a decreasing trend over the review period and corresponding probably to the period of gametes emission. von Bertalanffy growth parameters estimated were L ∞ = 28.35 cm, K = 0.49 year -1 , t 0 = -0.33 year and φ' = 2.59. Total mortality, natural mortality and fishing mortality are 1.39, 1.17 and 0.22 respectively. The exploitation rate (E = 0.16) showed that the resource was underexploited implying that the purse seine is not a danger for this species.

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“…Different studies (e.g., Belevèze, 1983;Grall et al, 1982;Minas et al, 1982Minas et al, , 1986Orbi et al, 1991;Roy et al, 1992) have shown that the dynamics of coastal pelagic fish stocks is closely associated with that of environmental factors such as intensity and seasonal and interannual variability of upwellings, aspects of primary or secondary production as well as hydrodynamic characteristics. Interestingly, the weather conditions are good for existence of important biomass of phytoplankton and zooplankton that mainly compose the diet of Sardinella species (Sossoukpe et al, 2016) leading to high productivity and the renewal of fish stock in the coasts of Mauritanian. At the Atlantic coast of Mauritania, weather conditions result from seasonal variations in three pressure centers: the Azores anticyclone, the Saint Helena high pressure, the Saharan depression and movements of the inter-tropical convergence zone (ZITC), which in Mauritania is only felt in the southern part up to the latitude of Nouakchott (18 °05N) (Domain, 1980).…”

Section: Artisanal Fishing and S Maderensis Stockmentioning

confidence: 99%

Untitled

2019

IJAPR

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Madeiran sardenella (Sardinella maderensis) is an important species actually fished in sea waters along the coasts of Mauritania with an increasing fishing state observed at different fisheries. Therefore, a critical study is necessary for sustainable conservation of the species. The aim of this work is to estimate the growth rate and the age of the species coming from artisanal fisheries at the Nouakchott fishermen's beach in Mauritania. The study was carried out from the landings of Madeiran sardenella stock landed at the artisanal fishmen's beach of Nouakchott during the period of January to September 2015. A total sample of 1048 specimens (568 females and 480 males) was collected. According to the method of Battacharya, 4 age-groups were identified. Using the equations of Von Bertalanffy, L∞ (cm) = 38.44, K = 0.53, and t0 =-0.60. The overall size-weight relationship gives an isometric overweight, defined by two allometric parameters: a = 0.007 and b = 3.09, with a high correlation coefficient (r = 0.93). A linear growing of the species was observed during the first year for both sexes; however females grow more than males while males live longer than females. Thus, the species has so far a capacity to support important exploitations; nevertheless, the fishing of the species need to be regulated to avoid an over-exploitation state and to build a sustainable management of the species.

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Growth and mortality parameters of P. senegalensis and P. typus (Sciaenidae) in nearshore waters of Benin (West Africa) and their implications for management and conservation

Cited by 25 publications

References 10 publications

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Diagnosis, Growth and Exploitation Rate of the Sapater (Chloroscombrus chrysurus, Linnaeus 1766) Fishing by Purse Seine in the Nearshore Waters of Benin

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