Marmara Denizi’nde Sivriburun Karagöz (Diplodus puntazzo Walbaum, 1792) Juvenillerinin Erken Yaşam Populasyon Parametreleri ve Yumurtadan Çıkış Analizi

Abstract

Bu çalışmada Marmara Denizi’nde dağılım gösteren sivriburun karagöz (Diplodus puntazzo Walbaum, 1792) türüne ait juvenillerin otolit mikro-yapısı kullanılarak yumurtadan çıkış analizi ve erken yaşam popülasyon parametrelerinin belirlenmesi amaçlanmıştır. Bireyler Kasım 2021 ile Mart 2022 tarihleri arasında deneysel ığrıp ağı ile 12 istasyondan örneklenmiştir. Çekim başına ortalama bolluk 1.1 adet/çekim olup, toplam bireylerin %44.4’ü Erdek istasyonundan elde edilmiştir. Boy-ağırlık ilişkisi denkleminden (W=0.0178L2.698) negatif allometrik büyüme tespit edilmiştir. Bireylerin günlük yaşları 78.9 ± 2.29 gün ortalama ile, 39 gün ile 141 gün arasında değişmiştir. Bireylerin ortalama günlük büyüme oranları ve ölüm oranları sırasıyla 0.213 mm/gün ve %4.38 olarak hesaplanmıştır. Yumurtadan çıkış yoğun olarak Eylül ve Ekim aylarında gerçekleşmiştir.

Keywords

• Mikroyapı
• Sagittal otolitler
• Üreme sezonu
• Popülasyon
• Erken yaşam

Early-Life Population Parameters and Hatch-Date Analysis of Sharpsnout Seabream (Diplodus puntazzo Walbaum, 1792) Juveniles in the Sea of Marmara, Türkiye

Abstract

This research aims to determine early-life population parameters and hatch date of sharpsnout seabream (Diplodus puntazzo Walbaum, 1792) juveniles using microstructure analyses of sagittal otoliths collected from the Sea of Marmara, Türkiye. Specimens were collected using an experimental beach seine at 12 stations from November 2021 to March 2022. The mean catch per unit effort (CPUE) was 1.1 individuals per haul, with 44.4% of the total D. puntazzo specimens collected at the Erdek Station. A negative allometric growth was calculated from the length-weight relationship equation (W=0.0178L2.698). The daily age ranged between 39 days-1 and 141 days-1, with a mean of 78.9 ± 2.29 days-1. The daily growth rate and mortality ratio were calculated as 0.213 mm/day and 4.38%, respectively. The hatching mainly occurred in September and October.

Keywords

• Microstructure
• Sagittal otoliths
• Spawning season
• Population
• Early-life

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