Abstract Red sea bream Pagrus major is extremely important in the aquaculture of Japan. The breeding red bream, which has a history more than half century, can be divided into three main categories. first selective breeding. Aquaculture Research Institute, Kindai University, began fast-growing breams early 1960s through mass selection. I summarized results selection and characteristics fish 199...

Abstract The effects of 17α-methyltestosterone administration on spermatophore quality in captive broodstock tiger shrimp Penaeus monodon were investigated using injection method and oral based the optimized protocol. experiment was designed to compare group with two replications during a 38-day experimental period. Captive male weighing 57-95 g collected from ponds stored 10,000 m 3 concrete t...

Urbanization can result in alteration of a watershed's hydrologic response and water quality. To simulate hydrologic and water quality impacts of land use changes, the Long-Term Hydrologic Impact Assessment (L-THIA) system has been used. The L-THIA system estimates pollutant loading based on direct runoff quantity and land use based pollutant coefficients. The accurate estimation of direct runo...

We investigated the androgenic effects of 17α- methyltestosterone (MT) on gonadal sex reversal in juvenile red spotted grouper Epinephelus akaara. The fish were immersed in 17α-MT at 1 and 5 mg/L. Treatment method of 17α-MT was once weekly for 4 and 8 weeks. Fish were sampled at 12 months after end of the treatment period in order to histological analysis. At the initiation of an experiment (70...

Masculinization of a female foetus by androgenic hormones produced by an arrhenoblastoma in the mother during pregnancy was described by Brentnall (1945). Masculinization and pseudohermaphroditism caused by the administration of 17-methyltestosterone to the mother during pregnancy was reported by Hayles and Nolan (1957), Grunwaldt and Bates (1957) and others. Since Wilkins, Jones, Holman and St...