Suman Bhusan CHAKRABOTY, Debasis MAZUMDAR, Urmi CHATTERJİ, Samir BANERJEE

Growth of mixed-sex and monosex Nile tilapia in different culture systems

Dört farklı kültür sisteminde 17 α – metiltestosteron uygulaması yapılan tek cinsiyetli Nil Tilapiyasının, Oreochromis niloticus büyümesi ile hormon uygulanması yapılmayan karma cinsiyetli balıklar karşılaştırılmıştır. Deney, 2 X 4 etmensel tasarımdan oluşmaktadır: birinci etmen hormon uygulaması (tek cinsiyet ve karma cinsiyetli balık), ikinci etmen ise kültür sistemidir (rezervuar, tek kullanım sistemi, kafes ve havuz sistemi). Altı ay boyunca balıklar beslenme ve stoklama yoğunluğunun benzer olduğu koşullarda kültüre alınmış; vücut ağırlığı, boy, günlük ağırlık artışı (DWG), spesifik büyüme oranı (SGR), yaklaşık vücut kompozisyonu ve yaşama oranı gibi farklı büyüme parametreleri analiz edilmiştir. Tek cinsiyetli tilapyanın, karma cinsiyetli balıklarla karşılaştırıldığında istatistiksel olarak daha yüksek (P

Anahtar Kelimeler:

vücut uzunluğu, vücut komposizyonu, yaşayabilme, büyüme oranı, canlı ağırlık artışı, balık havuzu, vücut ağırlığı, metodoloji, Oreochromis niloticus, sucul kültür, kültür balığı, metiltestosteron, protein içeriği, eşey oranı

Monoseks ve karma Nil tilapiyasının farklı kültür sistemlerinde büyümesi

Growth of 17α-methyltestosterone treated monosex Nile tilapia, Oreochromis niloticus was compared with hormone untreated mixed-sex fish in four different culture systems. The experiment had 2 X 4 factorial design: the first factor was presence or absence of hormone treatment (monosex and mixed-sex fish), the second factor was related to culture system (cistern, flow-through, pen and pond). Fish were cultured under similar feeding regime and stocking density for six months and different growth parameters such as body weight, length, daily weight gain (DWG), specific growth rate (SGR), proximate body composition and survival rate were analyzed. Monosex tilapia showed significantly higher (P-value <0.05) weight, length, DWG, SGR and protein content than mixed-sex fish. Fish in Pond culture showed significantly higher (P- value <0.05) weight, DWG and protein content than fish in other 3 culture systems. Survival was not significantly different (P>0.05) among mixed-sex and monosex fish and between different culture systems. Monosex tilapia in pond culture system showed the highest weight, DWG and protein content while mixed-sex tilapia in cistern culture system showed the lowest weight, DWG and protein content. Considering the results of this study, culture of monosex tilapia in earthen ponds might be considered the ideal method for tilapia culture in India.

Keywords:

body length, body composition, survival, growth rate, liveweight gain, fish ponds, body weight, methodology, Oreochromis niloticus, aquaculture, fish culture, methyltestosterone, protein content, sex ratio,

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