Some Population Parameters of the Sardinella maderensis (Lowe, 1838) in the Sombreiro River of Niger Delta

Year 2019, Volume: 15 Issue: 3, 354 - 364, 15.09.2019

Olaniyi Olopade , Henry Dıenye , Nathanael Akinsafe Bamıdele

https://doi.org/10.22392/actaquatr.532284

Abstract

A study was conducted to estimate the growth and stock characteristics of the Sardinella maderensis (Lowe, 1838) from Sombreiro River of Niger Delta, Nigeria. Results obtained revealed that mean total length and the mean weight of S. maderensis ranged between 4.1cm to 18.5 cm and 5g to 55.5g respectively. The b value of the length-weight relationship was 2.58 thus, the species could be categorized as displaying allometric negative growth and condition factor was very high, it ranged from 3.04 to 4.43. The estimated von Bertalanffy growth parameters (VBGP) of L∞, growth coefficient (k) and age at zero length (t0) were 23.31cm, 0.54 and -0.03/year respectively. The species showed year round recruitment patterns having two peak periods during April and July. The total mortality (Z) was 2.74 year-¹., the natural mortality rate (M) and fishing mortality (F) were 1.32 and 1.42 respectively. The estimated fishing mortality (Z-M=F) stood at 0.518. The lengthbased index of growth performance (Ø'– phi prime) for S. maderensis was estimated at 2.46. The length at first capture L50 was 27.31 cm. The exploitation rate (Emax) was 0.421 whereas (E0.1) was observed to be 0.355 indicating that that the level of exploitation is already high and to obtain the maximum sustainable yield, the present level of fishing effort should be reduced through appropriate fishing regulation techniques..

Keywords

Length- weight relationship, condition factor, population parameters, Sardinella maderensis, Sombreiro River, Nigeria

Sombreiro Nehri'ndeki (Nijer Deltası, Nijerya) Sardinella maderensis'in (Lowe, 1838) Bazı Popülasyon Parametreleri

Abstract

Bu çalışma, Nijerya'daki Nijer Deltası'nın Sombreiro Nehri'ndeki Sardinella maderensis (Lowe, 1838), populasyonlarının bazı büyüme ve stok özelliklerini belirlemek için yapılmıştır. Elde edilen sonuçlar, S. maderensis'in ortalama toplam uzunluk ve ortalama ağırlığının sırasıyla 4,1 cm ile 18,5 cm ile 5 g ile 55,5 g arasında olduğunu göstermiştir. Uzunluk-ağırlık ilişkisinin b değeri 2,58 olarak tespit edilmiştir, bu nedenle türler, allometrik negatif büyüme gösteriyor şeklinde kategorize edilebilir. Bu türün durum faktörü 3,04 ile 4,43 arasında çok yüksek olarak belirlenmiştir. Tahmini L∞, von Bertalanffy büyüme parametreleri (VBGP), büyüme katsayısı (k) ve sıfır uzunluktaki yaş (t0) sırasıyla 23,31cm, 0.54 ve -0.03 / yıl olarak belirlenmiştir. Türler, Nisan ve Temmuz aylarında iki tepe periyodu olmak üzere yıl boyunca dağılım göstermektedir. Toplam mortalite (Z) 2.74 yıl, doğal ölüm oranı (M) ve balıkçılık ölümleri (F) sırasıyla 1,32 ve 1,42 olarak bulunmuştur. Tahmini balık ölümü (Z-M = F) 0,518 seviyesinde gerçekleşmiştir. S. maderensis için uzunluk temelli büyüme performansı endeksi (Ø'– phi prime) 2.46 olarak hesaplanmıştır. İlk yakalama L50'deki uzunluk 7,19 cm olarak bulunmuştur. Emax (0,421) ve E0.1 (0,355) değerleri türden maksimum verim alınabilmesi için uygun balıkçılık düzenlemeleri ile mevcut avlanma baskısının azaltılması gerektiğini göstermektedir. 

Keywords

Length- weight relationship, condition factor, population parameters, Sardinella maderensis, Sombreiro River

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