Investigation into the gonadal maturation and development of spawning methods and breeding practices of the silver barb (Puntius gonionotus)
1993
D J U M A N T O
Use of gonadotropin releasing hormone analogue (LH-RH-A) combined with domperidone, a dopamine antagonist, to induce ovulation and spawning in silver barb (Puntius gonionotus) has been demonstrated both at the beginning and middle of the season. Dose levels 5 micro g, 10 micro g, and 15 micro g/kg body weight were compared. There was no relationship between dose and most indicators of spawning performance, except time latency which demonstrated that in the higher dose fish spawned faster. A higher dose in the early season gave lowest variability, in fecundity however. A circular flow was created using 3 sizes of submersible pumps, namely 10 l/minutes, 15 l/minutes and 25 l/minutes. Increase velocity depressed spawning performance in terms of relative fecundity. The action common carp (Cyprinus carpio) spawning in the same tanks as silver barb could stimulated the latter to ovulate and spawn. Spawning rate was low but release of eggs after manual stripping, indicated that a ratio 3:1 (numbers of common carp:silver barb) stimulated ovulation in 50 % of female fish. The result of respawning fish after different duration since their last ovulation demonstrated that this fish is able to spawn every month without affecting spawning performance in terms of spawning success, fecundity, fertility, hatching rate. Fish could spawn after only 15 days but fecundity was reduced. Microscopic investigation of the ovaries before and after spawning showed that the ovaries of the silver barb contained oocytes of different stages. During spawning the fish expelled all the mature oocytes in the dormant phase (more than 600 micro m in diameter) leaving primary oocytes.
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