The Israeli Journal of Aquaculture - Bamidgeh 52(4), 2000, 167-172

PARTIAL GONADECTOMY IN THE CATFISH
HETEROBRANCHUS LONGIFILIS (TELEOSTEI, CLARIIDAE):
REGENERATION TIME, QUALITY AND QUANTITY OF
POSTSURGICAL SPERM PRODUCTION


David Nguenga

Institute of Agricultural Research for Development (IRAD), Fishculture Research Unit, P.O. Box 255, Foumban, Cameroon

(Received 29.6.99, Accepted 4.2.01)

Abstract

Testes from adult male Heterobranchus longifilis were surgically removed, and the incisions sutured. Gonadectomized fish were kept in earthen ponds. The parameters used to evaluate the efficiency of the partial gonadectomy were the healing rate of wounds, the postsurgery survival, the time required for regeneration of the testes and the quality of postsurgical sperm production.

The incision closed within 7-8 weeks after surgery. The postsurgery survival rate was high (98%), indicating the efficiency of the surgical procedure. Functional testes were harvested 4-5 months after surgery, although the optimal regeneration time appeared to be about 6 months under the conditions prevailing in Cameroon’s tropical highland climate. No significant difference (p>0.05) in sperm production was observed between normal and gonadectomized fish. No difference was found in hatching rates achieved using milt derived from regenerated testes.

It is recommended that this procedure of partial gonadectomy be taken into account by hatchery managers in the design of long-term broodstock selection programs for catfish.

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