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Abstract
The present study was undertaken for production of cross koi through crossing between local and Thai koi (A. testudineus). Four crossing groups viz. parent Thai (P-T), parent local (P-L), Thai female and local male (F1-A), and local female and Thai male (F1-B) were designed to produce the cross koi. The ovulation rate was found to be the highest (100%) in (P-T) crossing group followed by (P-L), (F1-B) and (F1-A) crossing groups (80, 80 and 60% respectively). On the other hand, the fertilization rate was significantly (P<0.05) higher in (P-L) than (P-T), (F1-A) and (F1-B) cross groups. The highest hatching rate was also observed in (P-T) cross group which was significantly (P<0.05) different from that of the other groups. However, the highest survival rate was found in (Fi-A) followed by (P-T), (P-L) and (F1-B) crossing groups. The highest growth (length and weight) was found in (P-T) cross group followed by (F1- A), (F1-B) and (P-L) cross groups after 28 days of rearing. Results indicate that cross koi might have important implication for our aquaculture production.