author(s)
T Gowsalya and J Stephen Sampath Kumar

abstract
A comprehensive trial was conducted with three different protein sources such as Spirulina, earthworm and shrimp head meal for their cost-benefit analysis in the growth and maturation of goldfish was conducted. Troughs (45 l cap) were used for stocking and maintaining goldfish in replicates. Each ingredient was supplemented with two different concentrations (10% and 15%) and control diet was also made without any special ingredients. Sampling on biogrowth and gonad development parameters was done once in 10 days and 30 days, respectively. The highest feed conversion (75.89%) was observed with the diet containing shrimp head meal at 15% level (T₃₁) and highest GSI (31.54%) was observed in fishes fed with diet containing Spirulina at 10% level (T₁₂). This was found positive when cost-benefit analysis was done. Statistical analysis of data also revealed significant difference at 99% level in the GSI of the fishes fed with different diets and control feed.