The recruitment patterns of two palaemon shrimps and some physico-chemical characteristics in the River Nun Estuary, Nigeria

Abowei, J. F. N.; Ao, Davies; Ngodigha, Sabina

doi:10.4314/ijonas.v4i4.49891

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“…It is a very important aspect of population biology since it provides information about changes in the population. Mortality can be caused by fishing activity (fishing mortality) or by natural action (natural mortality) (Abowei and Hart, 2009;Abowei et al, 2010). According to Marshall (1993), mortality rates are of prime importance to fishery scientists in expressing the dynamics of fish population.…”

Section: Introductionmentioning

confidence: 99%

Length-Weight Relationship and population parameters of Pellonula leonensis Boulenger, 1916 (Clupeidae) in man-made Lake Taabo (Bandama basin; Côte d’Ivoire)

Koné¹,

Kraidy²,

Gnonléba³

et al. 2014

Int. J. Biosci.

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Length-Weight relationship and population parameters of Pellonula leonensis Boulenger, 1916 were studied in man-made Lake Taabo (Côte d'Ivoire). Samples were collected using beach seine with 6 and 8 mm mesh size from November 2008 to October 2009. Length frequency data collected were analyzed with FISAT software using the ELEFAN package to estimate the population parameters of Pellonula leonensis. The coefficient of allometry (b) was 3.24 and the correlation coefficient (r = 0.97) showed that there was a high and significant correlation between the standard length and the weight of P. leonensis. The asymptotic length (L∞) and growth rate constant (K) were estimated to be 6.56 cm and 0.86 year -1 . Based on these growth parameters, the estimated value for the fishing mortality coefficient (F) was 0.93 year -1 for P. leonensis in man-made Lake Taabo. Natural mortality coefficient (M) estimated was 2.55 year -1 and exploitation rate (E) was 0.27. The recruitment pattern of P. leonensis showed that there is a year round recruitment with the highest recruitment in April (24.84%) while the lowest recruitment were in November (0.42%) and December (0%).

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Section: Introductionmentioning

confidence: 99%