Abstract
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.
Highlights
Fisheries and aquaculture make a decisive contribution to the welfare and prosperity of the inhabitants of this world and fish is an important source of nutritious foods and animal protein for a large part of the world population (FAO, 2012)
These two causes have led to a scarcity of many resources, landings significantly lower than what they should be in a better balanced exploitation and a weakening of the populations boosting their abundant natural fluctuations
The Artisanal Fishing Port of Cotonou (AFPC) in the southern Benin (Figure 1), which is the core area of this study, is a public utility infrastructure located in the dock on the East side of industrial fishing port
Summary
Fisheries and aquaculture make a decisive contribution to the welfare and prosperity of the inhabitants of this world and fish is an important source of nutritious foods and animal protein for a large part of the world population (FAO, 2012) This explains the continual increase of fishery resources sampling rates which endanger the balance of the oceans. Two essential causes that led to this situation are recognized: on one hand, fishing capacities implemented far outweigh the stocks renewal potential; on the other hand the captures of young population are important These two causes have led to a scarcity of many resources, landings significantly lower than what they should be in a better balanced exploitation and a weakening of the populations boosting their abundant natural fluctuations
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