Amrollahi NARGES, Kochanian PREETA, Maremmazi JASEM, Eskandary GHOLAM-REZA, Yavary VAHID

Stock assessment of silver pomfret Pampus argenteus (Euphrasen, 1788) in the Northern Persian Gulf

Basra Körfezinin kuzeyinde (Kuzistan vilayeti) gümüş baltabaş balığı, Pampus argenteus için boy kompozisyonuna ait aylık veriler, Nisan 2004’ten Mart 2005’e kadar kaydedilmiştir. Boy sıklık verilerini analiz etmek için FİSAT yazılım paketinde ELEFAN testi kullanılmıştır. Ölçülen azami çatal boyu ve ağırlığı sırasıyla 312 mm ve 1.191 g olmuştur. von Bertalanffy büyüme parametre değerleri şöyledir: L∞= 339 mm; k = 0,55 $yıl^ {-1}$ ve $t _0$= -0,16 yıl. Anlık toplam ölüm oranına ait tahmini değer (z) av boy eğrisi yöntemine göre 2,07 $yıl^ {-1}$ olarak hesaplanmıştır. Büyüme parametreleri ve ortalama çevre sıcaklığına göre anlık doğal ölüm oranı, M 0,58 $yıl^ {-1}$ olarak hesaplanmıştır. Yıllık anlık avcılık ölüm oranı, F 1,49 $yıl^ {-1}$ olarak tahmin edilmiştir. Sömürme oranı, E 0,72 $yıl^ {-1}$ olarak hesaplanmış ve stoka katılan ürün başına yapılan analizin sonuçlarının gösterdiğine göre kaynak aşırı derecede sömürülmüştür. Basra Körfezinin kuzeyinde gümüş baltabaş balığı popülasyonunun korunması için bazı işletme önlemlerinin ivedilikle alınması gerekmektedir.

Anahtar Kelimeler:

Pampus argenteus, balıkçılık işletmeciliği, büyüme faktörleri, ölüm oranı, Basra Körfezi

Basra Körfezinin kuzeyinde gümüş baltabaş balığı, Pampus argenteus (Euphrasen, 1788) için stok değerlendirmesi

Monthly data of length composition for silver pomfret, Pampus argenteus, were recorded from the Northern Persian Gulf (Khuzestan province), between April 2004 to March 2005. ELEFAN in the software package FiSAT was used to analyse the length frequency data. The maximum measured fork length and weight were 312 mm and 1191 g respectively. The parameter values of the von Bertalanffy growth function were: L∞= 339 mm; k = 0.55 $year^ {-1}$ and $t _0$= -0.16 year. The estimated value of the instantaneous rate of total mortality, z based on length converted catch curve was 2.07 $year^ {-1}$ . The instantaneous rate of natural mortality, M based on the growth parameters and mean environmental temperature was 0.58 year -1. The annual instantaneous fishing mortality rate, F was estimated to be 1.49 $year^ {-1}$ . The exploitation rate, E was 0.72 $year^ {-1}$ and the results from the yield-per-recruit analysis indicated that the resource was heavily over-exploited, and some measures of management should be rapidly implemented to protect the silver pomfret population in the Northern Persian Gulf.

Keywords:

Pampus argenteus, fishery management, growth factors, mortality, Persian Gulf States,

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