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
Institute of Agricultural Research for Development (IRAD), Fishculture Research Unit, P.O. Box 255, Foumban, Cameroon
(Received 29.6.99, Accepted 4.2.01)
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.