Determination of Some Biological Characteristics and Population Parameters of the Blotched Picarel (Spicara flexuosa Rafinesque, 1810) Distributed in the Eastern Black Sea (Rize - Hopa)

Yusuf CEYLAN,Hatice ONAY,Göktuğ DALGIÇ,İbrahim Oğuz ERGÜN

doi:10.33714/masteb.814299

Yusuf CEYLAN, Hatice ONAY

Open Access

https://doi.org/10.33714/masteb.814299

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Abstract

This study was carried out in order to determine some biological characteristics of the fish species of Spicara flexuosa, which is distributed on the Eastern Black Sea coast, and to contribute to the management of the picarel in all the seas of our country. Between October 2015 and September 2016, 599 fish samples were obtained and examined in the laboratory. It was determined that the examined individuals were distributed between the ages of I-VII which 31.22% of the population was male and 68.78% was female. The minimum-maximum total length values of the samples were between 8.7 and 21.8 cm; and the weight values ranged from 7.1 to 129.94 g. It has been determined that the mean total length of males is statistically different from that of females (P&lt;0.05). Von Bertalanffy growth equilibrium was calculated as "L∞=22.71 cm TL, K=0.243 year-1, t0=-2.306 year-1; W∞=118.27 g" for females, "L∞=38.34 cm TL, K=0.063 year-1, t0 = -6.381 year-1; W∞=755.37 g" for males, and "L∞=33.42 cm TL, K=0.080 year-1, t0=-5.381 year-1; W∞=401.24 g" for all individuals. The length-weight relation of all individuals was found as W= 0.0118*L2.9727 (R2=0.9487). When the ratio of gonadosomatic index (GSI) data and gonadal maturity stages were examined over the year, it was determined that the reproduction of the picarel in the Black Sea occurred between June and September.

Highlights

Species that belong to the genus Spicara occur in shallow rocky and muddy bottoms throughout the Mediterranean and the Black Sea, in the Atlantic from Portugal to Morocco and around the Canary Islands (Fischer et al, 1987; Froese & Pauly, 2013)
This study was carried out in order to determine some biological characteristics of the fish species of Spicara flexuosa, which is distributed on the Eastern Black Sea coast, and to contribute to the management of the picarel in all the seas of our country
When the ratio of gonadosomatic index (GSI) data and gonadal maturity stages were examined over the year, it was determined that the reproduction of the picarel in the Black Sea occurred between June and September

Summary

Introduction

Species that belong to the genus Spicara occur in shallow rocky and muddy bottoms (in the coastal shelf up to 130 m depth) throughout the Mediterranean and the Black Sea, in the Atlantic from Portugal to Morocco and around the Canary Islands (Fischer et al, 1987; Froese & Pauly, 2013). For many years Spicara flexuosa Rafinesque, 1810 considered as the synonym of Spicara maena (Linnaeus, 1758) but cariological and genetic studies conducted in the recent years prove that those both are two different species (Vasiliev, 1980; Chiba et al, 2009; Imsiridou et al, 2011; Turan, 2011). Spicara flexuosa is distributed widely along the Turkish coastline (Bilecenoğlu et al, 2014) and various studies (Vasiliev, 1980; Vasilieva & Salekhova, 1983; Ilkyaz et al, 2007, Imsiridou et al, 2011, Turan, 2011; Minos et al, 2013, Bektaş et al, 2018) on the genetics and morphology of the species are available. The aim of this study is to reveal the age, growth, reproduction, mortality and population structure of S. flexuosa distributed in the South East Black Sea

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