Cuttlefish are members of the cephalopod class, that die en masse following a single breeding season (monocyclic spawning). In line with changes in environmental factors, they spent their lives in coastal areas at a depth range of 0-200 m. Although adults prefer deep areas before breeding season, they migrate to coastal areas again for breeding activity and die as a result of natural factors at the end of the breeding period. Knowledge of the life cycle and especially the reproduction phase of their life is crucial information to be able to sustainably exploit these species. Even though the coastline of Turkey, due to the variations of the environmental conditions, it's known that there are differences in reproductive characteristics among the subpopulations of the species.To determine the reproductive characteristics of the Antalya Bay subpopulation of the species, a total of 516 individuals (247 male and 269 female individuals) were examined. The mantle length of the examined individuals ranged between 45 – 177 mm. By using the morphologic characters 4 stages of sexual maturity could be observed for both sexes. Within the scope of our study, the relationship between height and weight, gonad development status (sexual maturity indices) and the number of eggs in female individuals with biometric characters were determined for the population in the sampling area.

Bu çalışmada, Antalya İli’nde yetiştirilen gökkuşağı alabalığı kültür popülasyonundan büyüme hormonu I geni izole ve karakterize edilmiştir. Bu amaçla kültür popülasyonundan 10 birey örnek olarak alınmıştır. Örneklenen balıkların kas dokularından toplam DNA izole edilmiştir. Polimeraz zincir reaksiyonunda kullanılmak üzere primerler dizayn edilmiş ve hedef gen bölgesi çoğaltılmıştır. İzole edilen genin dizi analizi yapılmış ve 4591 nükleotitten oluştuğu tespit edilmiştir. Referans diziye kıyasla 2 transisyonel, 14 transversiyonel ve 38 insersiyonel baza karşılık gelen 54 nükleotitten oluşan mutasyon bulunmuştur. Tüm nükleotit farklılıkları genin intron bölgelerinde tespit edilmiştir. Genin intron bölgelerinde yer alan putatif hormon yanıt elemanları (HRE) değerlendirildiğinde ise daha önce raporlanan dizi ile tamamen uyumlu olduğu görülmüştür. Elde edilen veriler filogenetik ve gen aktarım çalışmalarında kullanılabilecek niteliktedir.

This study evaluates the growth performance and survival rate of Pethia conchonius (Hamilton 1822) larvae fed microworms (Panagrellus redivivus, Linné 1767) compared with Artemia salina nauplii and granular feed. Fifteen-day old larvae that had completed yolk-sac absorption and an initial Artemia-based prefeeding period (initial mean weight: 0.010 g; mean length: 0.657 cm) were randomly divided into four groups (A. salina nauplii (Group A; control), P. redivivus (Group M), granular feed (Group Y), and P. redivivus + granular feed (Group M+Y). Each group was designed with three replicates; live body weight, total length, specific growth rate (SGR), and condition factor were measured at 9-day intervals for a 36-day feeding period. At the end of the experiment, the survival rate remained above 95% in all groups; no statistically significant differences were found between the groups (p > 0.05). The highest live weight was obtained in Group M+Y (0.0948 ± 0.001 g); this value was higher than in the artemia control group (0.0748 ± 0.001 g). Length growth also followed a parallel pattern; Group M+Y reached the highest total length with 1.424 ± 0.008 cm. In the first nine days, Group M+Y and Group A exhibited statistically equivalent SGR (10.171 ± 0.259 and 10.354 ± 0.456 %/day, respectively; p > 0.05); from day 18 onwards, Group M+Y surpassed all other groups. The difference between Group M and Group Y did not maintain its statistical significance throughout the experiment (p > 0.05). These findings reveal that applying a co-feeding protocol of microworms and 150–300 µm granular feed from day 15 onwards in P. conchonius larvae can provide higher growth performance and remove the need for continued Artemia feeding beyond day fifteen. P. redivivus is recommended as a low-cost and sustainable live-feed alternative for the post-larval stage of ornamental fish.