the stimulatory effect of ovaprim, a commercial spawning inducing agent consisting of salmon gonadotropin releasing analogue (gnrha) and a dopamine d2- receptor antagonist, domperidone, was studied in doctor fish, garra rufa (heckel, 1843) under hatchery conditions. the feeding and rearing condition effects on the survival rate of naturally produced larvae were also evaluated. twenty-five fish ...

a. Evaluate efficacy of catfish pituitary extract on spawning induction of pinfish. b. Evaluate dosing of catfish pituitary extract on spawning induction of pinfish. c. Compare human chorionic gonadotropin and catfish pituitary extract on the spawning induction of pinfish. d. Evaluate commercial rotifer enrichments and their effects on larval survival and growth. e. Evaluate larval feeding regi...

Sex steroids have long been known to exist in molluscs, but few studies have focused on the roles of these substances in molluscan reproduction. In this study, we demonstrate that injections of estradiol into ripe sea scallops induced spawning in both sexes, testosterone injections induced spawning in males only and progesterone blocked spawning in both sexes. We also show that injections of se...

The enhanced ability to direct sexual reproduction may lead to improved restoration outcomes for Acropora cervicornis. Gravid fragments of A. cervicornis were maintained in a laboratory for two sequential trials in the seven days prior to natural spawning in the Florida Keys. Ten replicates of five chemicals known to affect spawning in various invertebrate taxa were tested. Hydrogen peroxide at...

The influence of behavioral and environmental variables on the initiation of spawning in Trichogaster trichopterus was investigated. The behavioral responses of isolated males and females to conspecific visual and chemical stimuli were also examined. Fish in divided aquaria were administered visual cues of a conspecific through a glass partition, chemical cues by an exchange of water between th...

Changes in ethoxyresorufin-O-deethylase (EROD) activity were monitored through an extended 6-month dietary exposure to determine the relationship between EROD activity and uptake of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in brook trout, Salvelinus fontinalis. Brook trout were fed labeled TCDD during a 4-week loading phase and an 11-week maintenance phase to achieve whole-body concentrations...

In the present study, biological function of recombinant gonadotropin-releasing hormone associate peptide (rGnRH) was tested for induction ovulation and spawning in Sterlet sturgeon (Acipenser ruthenus) broodstock. For this purpose, broodstock were divided into four treatments treated with following preparing procedure: 0.9% NaCl (C); 2.5 ?g kg body weight?1 (BW) LHRH-A2 (luteinizing hormone-re...

Artificial cultivation increases clams' availability and is an alternative to the extraction from natural banks. The culture of clams requires species-specific research in different growth stages, studies on effects interactions parameters are essential obtain control proper development larvae. This paper aims compare methods induce spawning, describe embryonic development, effect densities yie...