Cüneyt Suzer

Allometric Growth in Hatchery-Reared Gilthead Seabream

Abstract Morphological development and allometric growth were investigated in the gilthead seabream Sparus aurata during larval development until the end of the weaning period on day 41. Fertilized eggs had a diameter of 1.01 ± 0.02 mm (mean ± SE) and a lipid vesicle diameter of 0.227 ± 0.021 mm. Mean total length (TL) was 2.68 ± 0.04 mm for newly hatched larvae and 3.57 ± 0.09 mm at the onset of feeding (4 d after hatching [DAH]). At 10 DAH, initial swim bladder inflation occurred, mean TL was 4.19 ± 0.08 mm, and notochord length (NL) was 4.00 ± 0.07 mm. At 16 DAH, the swim bladder became more elongated, TL was 5.13 ± 0.09 mm, and NL was 4.94 ± 0.07 mm. Notochord flexion occurred at 6.46 ± 0.11 mm TL on 23 DAH, and the complement of the flexion occurred at 8.67 ± 0.109 mm TL on 35 DAH. At the end of the weaning period (at 41 DAH), larvae were 10.85 ± 0.116 mm TL. The majority of all allometric changes from the inflection point were expressed during the larval stage and integrated with the metamorphosis s...

Kültür koşullarında yetiştirilen Avrupa deniz levreklerinde (Dicentrarchus labrax) iskelet deformasyonları

Bu calismada yetistiriciligi yogun olarak yapilan Avrupa deniz levreklerinin ( Dicentrarchus labrax ) kultur kosullarinda, erken donemlerinde (0-42 DAH) notokorda bukulmesine bagli olarak meydana gelen kemik ve kikirdak yapi deformasyonlari incelenmistir. Kemik ve kikirdak yapida meydana gelen deformasyonlarin tespiti icin 836 levrek larvasi ikili boyama yontemi kullanilarak, Alcian mavisi ve Alizarin kirmizisi ile boyanmistir. Yumurtadan yeni cikmis levrek larvasinin ortalama toplam boyu 3,46±0,02 mm, olarak belirlenmis, larval donemin sonunda ortalama 18,58±0,1 mm olarak tespit edilmistir. Incelenen 836 adet larva icinde, 270 adet deforme larva ve bu larvalarda toplam 1256 adet deformasyon tespit edilmistir. Iskelet deformasyonu orani %32 olarak belirlenmistir. Levrek larvalarinda en fazla karsilasilan deformasyon omurga malformasyonu olmus (%21,3) bunu omur erimesi (%18,6) ve lordosis (%12,7) takip etmistir. Bu calismada en fazla deformasyon notokorda bukulmesi sonrasinda (%52,1) tespit edilmistir.