Şahin Saka

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...

SERUM BIOCHEMISTRY OF FARMED BLUEFIN (Thunnus thynnus L.) IN THE AEGEAN SEA

Values of blood biochemistry are important for all animals in terms of health and welfare, providing knowledge of evidence in diseases. One of the most economically important fish species bluefin tuna-BFT ( Thunnus thynnus L.) in aquaculture considering high prices in the related business. Accordingly, farmers care about fattening fishes and some analyses provide significant knowledge, especially blood analyses for them. In the study, blood samples were recovered from fishes (10 male and 12 female) in fattening farms at Ildir, Cesme, Izmir province, East of Aegean Sea. Fork length and weight values were 140–180cm, and 40–80kg, respectively. Water quality parameters such as temperature, salinity, dissolved oxygen, pH and turbidity were indicated as 16–20 o C, ‰ 35.7–38.2g L -1 , % 6.9-7.8mgL -1 , 36.8–38.2m. The research measured uric acid 4.32mg/100mL -1 , creatinine 1.12mg/100mL -1 , serum urea concentration 15.04mg/100mL -1 ), albumin 2.30g/100mL -1 , globulin 2.56g/100mL -1 , total protein 6.15g/100mL -1 , serum glutamic oxaloacetic transaminase 178.24UL -1 , serum glutamate pyruvate transaminase 141.52UL -1 , alkaline phosphatase 54.26UL -1 , g-glutamyl transferase 220.14UL -1 , total cholesterol 272.04mg/100mL -1 , triglycerides 320.75mg/100mL -1 , high-density lipoprotein 88.68mg/100mL -1 and low-density lipoprotein 180.18mg/100mL -1 . Results during the fattened period in growing cages indicates that BFTs were under pressure and stress attacks because of unnatural habitats such as feeding, narrow area etc. in farm area. Also, males were more sensitive and undergo more stress than females.

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.