Dip trol balıkçılığında Norveç ıstakozunun (Nephrops norvegicus) morfolojik özellikleri kullanılarak seçiciliğinin tahminine ilişkin bir ön çalışma

Öz

Bu çalışma, Norveç ıstakozunun (Nephrops norvegicus) morfolojik özelliklerinden yararlanılarak dip trol balıkçılığında kullanılan farklı torba ağ göz açıklıkları için elde edilebilecek olası L₅₀ seçicilik parametresinin önceden tahmin edilebilmesine yönelik bir ön çalışmayı kapsamaktadır. Laboratuvarda yapılan morfolojik tespit çalışmaları ve sonrasında bilgisayar ortamında yapılan simülasyon olarak iki aşamalı olarak gerçekleştirilmiştir. Çalışmada populasyonu mümkün olduğunca temsil edebilecek en küçükten en büyüğe kadar farklı boy gruplarındaki (18- 61 mm karapas boyu) 20 adet Norveç ıstakozu kullanılmıştır. Bireylerin karapas boyları ve ağırlıkları tespit edilmiş ve ağ göz kalıplarından kaçma/geçme olasılıkları test edilmiştir. Daha sonra veriler FISHSELECT’e aktarılmış ve simülasyon başlatılmış, türe ait L₅₀ değeri için ağ göz büyüklüğü ve açıklık derecesine karşı gelen izobar grafiği elde edilmiştir. FISHSELECT simülasyonu sonucunda Norveç ıstakozu için seçilen 3 farklı vücut kesiti için sırasıyla CS1 için ships (133,745; R²= 0,810), CS2= 192,324; R²= 0,961) ve CS3 (184,590; R²= 0,948) için ise Flexelips 1 en uygun model olarak tespit edilmiştir.

Anahtar Kelimeler

• Nephrops norveciqus
• FISHSELECT
• Seçicilik
• Morfolojik özellik
• Simülasyon

A preliminary study on the estimation of selectivity of Norwegian lobster (Nephrops norvegicus) using morphological characteristics in bottom trawl fishing

Abstract

This study includes a preliminary study to predict the possible L₅₀ selectivity parameter, which can be obtained for different mesh sizes used in bottom trawl fisheries, by using the morphological features of the Norwegian lobster (Nephrops norvegicus). The study was carried out in two stages as morphologically based works in the laboratory and then simulation studies in the computer-based. In the study, 20 Norwegian lobsters in various sizes, from the smallest to the largest (18-61 mm carapace length), were used to represent the population as much as possible. In laboratory studies, the carapace lengths and weights of these individuals were measured and the probability of escaping/passing from the mesh templates was tested. The data transmission to FISHSELECT software and also simulation process were done and isobar figures showing the L₅₀ values of Norway lobster against mesh sizes and mesh openness degrees were produced. As result of the FISHSELECT simulation, it was determines as the best model ships for 133,745; R²= 0,810), CS2= 192,324; R²= 0,961) ve CS3 (184,590; R²= 0,948) As a result of FISHSELECT simulation, for 3 different body sections selected for Norway lobster , ship for CS1 and Flexellips 1 for CS2 and CS3 were determined as the most suitable models, respectively.

Keywords

• Nephrops norvegiqus
• FISHSELECT
• Selectivity
• Morphology
• Simulation

Kaynakça

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