Köyceğiz-Dalyan Lagün Ekosistemi Kefal Populasyonlarının Büyüme Performans İndeksleri

Tropikal ve ılıman kuşakta yaygın olduğu gibi Türkiye’nin lagoon, haliç ve kıyıları boyunca avlananbalıkların en önemlilerini kefal türleri oluşturmaktadır. Köyceğiz-Dalyan Lagün Ekosistemi(KDLES), 5500 ha’lık yüzey alanı ile ekolojik, turistik ve balık verimliliği (52 kg/ha) açısındanTürkiye’nin Akdeniz kıyısındaki en önemli lagünüdür. Lagünün dalyan sistemlerinde; yıllık 5 toncivarında kurutulmuş balık yumurtası elde etmek için yaklaşık 225 ton (80–405 ton) kefalavlanmaktadır. Lagünde balık üretiminin % 70’ini kefaller oluşturur. Kefal örnekleri Ekim 1992- Eylul 1994 tarihleri arasında biri deniz istasyonu olmak üzere sekiz istasyondan fanyalı ağlar ile aylıkolarak toplanmıştır. İncelenen balıkların yaşları pullardan belirlenmiş olup populasyonda 0-6 yaşdağılımı tespit edilmiştir. Örneklenen 1159 adet bireyin tür kompozisyonu oransal olarak; Mugilcephalus %45, Liza aurata %35, Liza saliens %14, Liza ramada %12, Chelon labrasus %6 olarakbulunmuştur. Von Bertalanffy büyüme parametrelerinden hesaplanan tüm bireylere ait büyümeperformansı indeksleri (Ǿ), M. cephalus, L. aurata, L. saliens, L. ramada ve C. labrasus için sırasıyla2,957; 2,866; 2,692; 2,719; 2,901 olarak hesaplanmıştır. Köyceğiz-Dalyan Lagün Ekosistemi kefaltürlerinin büyüme performans indeksi dünya ortalamaları ile benzer bulunmuştur.

Growth Performance Indeces of Grey Mullet Populations in Köyceğiz-Dalyan Lagoon Ecosystem (Turkey)

As it is common in tropical and temperate zones, mullet species constitute the most important fishspecies caught along the coast and estuaries of Turkey. In terms of ecology, tourism and and fishproductivity (52 kg/ha), Koycegiz-Dalyan Lagoon Ecosystem (KDLES) is the most important lagoon,with a 5500 ha surface area, is the Mediterranean Coast of Turkey. In the dalyan (barrier fish trap)systems; approximately 225 tons (80-405 tons) of mullets are caught to obtain 5 tons of dried fisheggs per year. Seventy percent of fish production in the lagoon is composed of mullets. The mulletsamples were collected monthly between October 1992 and September 1994 from eight stations (oneof them is a marine station) by trammel nets. The ages were determined using by scales anda gecomposition varied form 0 to 6 ages. Species composition of 1159 sampled individuals wereproportionally determined as Mugil cephalus 45%, Liza aurata 35%, Liza saliens 14%, Liza ramada 12%, Chelon labrasus 6%. The growth performance indices calculated from von Bertalanffy growthparameters using by all individuals for the M. cephalus, L. aurata, L. saliens, L. ramada and C.labrasus were determined as 2.957, 2.866, 2.692 and 2.719, respectively. The highest growthperformance index was calculated for M. cephalus. The growth performance indeces of mullet speciesin Köyceğiz-Dalyan Lagoon Ecosystem were found around the world averages.

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