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- W992056594 abstract "This thesis developed techniques for the large-scale breeding of marine fish in New SouthWales. It provides the first published account of the hormone induction and larval rearing tometamorphosis of Australian bass Macquarie novemaculeata (Percichthyidae), snapperPagrus auratus (Sparidae), mulloway Argyrosomus hololepidotus (Sciaenidae) and sandwhiting Sillago ciliate (Silliganidae) in Australia. Wild-caught broodstock were induced tospawn using hormones (hCG, LHRHa, Ovaprim) and either spawned naturally or werestripped. Pagrus auratus and S. ciliate were found to be multiple spawners with asynchronousovaries. Conversely, M. novemaculeata and A. hololepidotus were found to be highly fecundsingle spawners having group synchronous ovaries. All four species were successfullyinduced to ovulate after periods in captivity ranging from one to five years. Species specificdifferences in hormone induction were determined, particularly in relation to the overripeningof eggs and the optimum time between treatment and stripping.Commercial scale batches of larvae were reared in 2000 L conical tanks and replicatedexperiments were conducted in aquaria ranging in size from 2 to 70 L. Larval development forall four species was described and egg size, time to hatch, size at hatch, yolk size, oil globulesize, and beginning of exogenous feeding were compared among species. First feedinglarvae were reared on rotifers Brachionus plicatilis and then brine shrimp Artemia sp..Survival, growth and weaning of larvae at metamorphosis were compared.Factors affecting larval survival, particularly those influencing initial swim bladderdevelopment were tested in replicated laboratory experiments. The timing of swim bladderinflation was found to coincide with the start of exogenous feeding but feeding was notrequired for initial swim bladder inflation. Larvae that failed to inflate their swim bladder grewpoorly and were susceptible to stress induced mortality. Light intensity, was shown to be animportant factor influencing swim bladder inflation in cultured larvae. The effect of lightintensity on inflation in M. novemaculeata and S. ciliate was quantified. Exposure tocontinuous light (100-200 Lux) inhibited inflation in M. novemaculeata. In contrast, S. ciliatewere shown to have a diel pattern of nocturnal inflation and required higher light intensities tofeed (1000 Lux). Manipulative experiments with S. ciliate larvae showed that they respondedto darkness by inflating their swim bladders. Other abiotic factors such as surface access, lowsalinity and high aeration were shown to reduce inflation in larvae. Initial swim bladder inflationstrategies are discussed and recommendations made regarding the importance ofmaximising inflation.The results of the study were used to assess the relative difficulty of intensive commercialproduction of each species for aquaculture." @default.
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- W992056594 date "1995-01-01" @default.
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- W992056594 title "Induced ovulation and larval rearing of four species of Australian marine fish" @default.
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