Sivriburun Karagöz (Diplodus puntazzo) Larvalarının Kültür Koşullarında Erken Dönem Gelişimleri

Öz

Bu çalışmada yoğun kültür koşulları altında üretilen sivriburun karagöz (Diplodus puntazzo) larvalarının notokorda bükülme zamanına göre boy ve ağırlık gelişimleri incelenmiştir. Prelarval dönemde yumurtadan çıkıştan itibaren 12 saat boyunca larvalar örneklenmiş ve total boy (TB), vitellüs kesesi hacmi ve yağ damlası hacmi hesaplanmıştır. Larval gelişim, yumurtadan çıkıştan itibaren 42. güne kadar tanımlanmıştır. Larvalar yumurtadan çıktıkları andan itibaren canlı yemin tamamen kesildiği güne kadar üç günde bir örneklenmiştir. Sivriburun karagöz larvaları 15 m3 tanklarda, değişken fotoperiyot rejimi altında tutulmuş ve ağız açılımıyla birlikte rotifer, Artemia nauplii ve Artemia metanauplii ile beslenmiştir. Yeşil su tekniği 30-40.104 hücre.ml-1 olacak şekilde Nannochloropsis sp. and Isochrysis sp. türleri verilmiştir. Yumurtadan çıkan larvanın total boyu 2,91±0,11 mm, vitellüs kesesi hacmi 0,338375±0,0434 mm3, yağ damlası hacmi 0,007609±0,00251 mm3 olmuştur. Vitellüs kesesi 20,0±0,05°C su sıcaklığında 96. saatte 3,35±0,15 mm TB emilirken, yağ damlası tükenmesi 120. saatte 3,47±0,13 mm TB’da olmuştur. Yumurtadan çıkan prelarvanın kuru ağırlığı 0,0189±0,0011 mg olurken notokorda bükülmesinin meydana geldiği 15 günde 0,0895±0,002 mg ve notokorda bükülmesinin sonlandığı 24. günde 0,2806±0,0048 mg olarak tespit edilmiştir. Çalışmanın sonlandığı 42. günde kuru ağırlık 2,9018±0,0121 mg olmuştur

Anahtar Kelimeler

• Sivriburun Karagöz, Diplodus puntazzo, larval gelişim, larval yetiştiricilik, büyüme

Early Life Development of the Sharpsnout Seabream (Diplodus puntazzo) under Culture Condition

Abstract

In this study, total length and weight development of sharpsnout sea bream (Diplodus puntazzo) larvae were investigated depending on depend on flexion of notochord under culture conditions. Newly hatched larvae were sampled 12-h interval from the hatching and also total length (TL), yolk-sac and oil globule volume were measured during the yolk-sac stage. Larval stage was identified from hatching to day 42. Larvae were sampled 3 days interval from hatching until end of the weaning. Larvae were stocked in 15 m3 tanks and photoperiod was adjusted through out larval stage. Larvae were fed rotifer, Artemia nauplii and Artemia metanauplii after mouth opening. Green water technique was used by means of Nannochloropsis sp., Chorella sp., and Isochrysis sp. at a density of 3−4*105 cells ml-1. Total length, yolk-sac and oil globule volume of newly hatched larvae were measured as 2.91±0.11 mm, 0.338375±0.0434 mm3 and 0.007609±0.00251 mm3 respectively. Absorption of yolk-sac and oil globule were observed 3.35±0.15 mm TL at 96 h 3.47±0.13 mm TL at 120 h respectively. Dry weight of newly hatched larvae were weighed as 0189±0.0011 mg while this parameter was measured as 0.0895±0.002 mg and 0.2806±0.0048 mg at the beginning of the flexion of notochord on day 15 and at the end of the flexion of notochord on day 24, respectively. Finally, at the end of the study larvae were weighed as 2.9018±0.0121 mg on day 42 in the end

Keywords

• Sharpsnout Seabream, Diplodus puntazzo, larval development, larval rearing, growth

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