Growth, mortality, recruitment and yield of Parailia pellucida Boulenger, 1901 (Osteichthyes: Schilbeidae) in a tropical flood river system, southeastern Nigeria

Autor:	Bilikis Iyabo Uneke, Florence Okoh, Okechukwu Idumah Okogwu, Christopher Didiugwu Nwani
Rok vydání:	2011
Předmět:	Fishery Overexploitation Southeastern Nigeria Flood myth Relative yield Ecology Mortality rate Fishing Animal Science and Zoology Schilbeidae Biology Parailia pellucida biology.organism_classification
Zdroj:	Acta Zoologica Lituanica. 21:10-16
ISSN:	1648-6919 1392-1657
DOI:	10.2478/v10043-011-0006-2
Popis:	The growth parameters, mortality rates, exploitation rate, recruitment pattern, yield/biomass per recruit and the corresponding fishing mortality at this level of Parailia pellucida (Boulenger) in the Anambra flood river system, southeastern Nigeria, was studied using the length-frequency based analysis of FiSAT II software. Growth parameters were as follows: asymptotic length (L∞) = 11.03 cm TL, growth curvature (K) = 0.63 yr-¹. The total mortality (Z) = 2.42 yr-¹, natural mortality (M) = 1.68 yr-¹, and fishing mortality (F) was 0.74 yr-¹. Exploitation rate (E) was 0.31. P. pellucida exhibited the bimodal continuous recruitment pattern. The Selection Ogive procedures for relative yield/biomass per recruit showed that Emax was 0.70. The stock was not overexploited (E < Emax); the fishing pressure should be maintained and monitored to guide against possible overexploitation since the flood river system operates unrestricted and unregulated fisheries activities.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d19ceee22d7ef232a65398a100ced464 https://doi.org/10.2478/v10043-011-0006-2 Zobrazit plný text záznamu