Dilek UÇKUN, Melahat TOĞULGA, Sencer AKALIN

İzmir Körfezi' nde hamsi (Engraulis encrasicolus L., 1758)' nin yaş ve büyüme özellikleri üzerine araştırmalar

Bu araştırmada, Ocak 1997-Aralık 1997 tarihleri arasında İzmir Korfezi'nden gırgır tekneleriyle avlanan balıkçılardan temin edilen 1161 adet hamsi (Engraulis encrasicolus, L, 1758) bireyi incelenmiştir. Örneklerin çatal boyları 6.2-14.0 cm ile ağırlıkları 1.46-22.47 g arasında değişmiştir. Dişiıerkek oranı 1:0.33 ve maksimum yaş III olarak tespit edilmiştir. En fazla bireye I yaş grubunda rastlanmıştır. Tüm bireyler için boy ve ağırlığa göre von Bertalanffy büyüme denklemleri $L_t=14.93(1-e-^{-0.628(t-0710)})$ $W_t=26.17 (1-e^{-0.628(t-0.710)})^{3.130}$ olarak bulunmuştur. Boy-ağırlık ilişkisi denklemi $W=0.0057*L^{3130}$ olarak hesaplanmıştır. Kondisyon faktörü değerleri dişi bireylerde 0.449-0.839, erkek bireylerde ise 0.550-0.864 arasında tespit edilmiştir.

Investigations of the age and growth of anchovy (Engraulis encrasicolus L., 1758) in İzmir Bay

Investigations of the age and growth of Anchovy (Engraulis encrasicolus L, 1758) in Izmir Bay. In this study, a total of 1161 anchovy (Engraulis encrasicolus, L, 1758), specimens collected from the purse-seine boats operating in İzmir Bay during the period from the January 1997-December 1997 were investigated. The fork length and the total weight of both sexes varied from 6.2-14.0 cm and from 1.46-22.47 g, respectively. Female:male ratio was 1:0.33 and maximum age group was determined as III. Most specimens belonged to age group I. The von Bertalanffy's growth equations in length and weight were $L_t=14.93(1-e-^{-0.628(t-0710)})$ and $W_t=26.17 (1-e^{-0.628(t-0.710)})^{3.130}$ for all specimens. Length-weight relationship equation were estimated as $W=0.0057*L^{3130}$. Condition factors were determined between 0.449 and 0.839 for females, from 0.550-0.864 for males.

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