There are many ways to genetically modify fish including inbreeding, gynogenesis, androgenesis, selection, intraspecific crossbreeding, interspecific hybridization, polyploidy, sex reversal and breeding, nuclear transplantation and transgenesis. Cloned populations have been produced via gynogenesis and androgenesis (Dunham 2004 in press), but direct cloning of an individual fish of interest has...

treatment efficiency, design factors and kinetic coefficients were studied using two pilots of activated sludge (as) and powdered activated carbon technology (pact), for treating tehran oil refinery effluent, in a duration of more than 12 months in order to evaluate the performance of each system against growth inhibitor shock loads, different concentrations of phenol and furfural (10-300 mg/l)...

In the present study, effect of cortisol on the ovary of the freshwater fish Notopterus notopterus was studied during four phases of the reproductive cycle. The hormone was injected 60microg/fish for ten days. Cortisol in fish is known to increase the metabolic activity. After the hormone treatment the ovarian somatic index and the hepatosomatic index increases during non breeding phase. The yo...

The American paddlefish, Polyodon spathula (Walbaum), is an endangered acipenserid fish. Its wild populations are supplemented with stocking material that is obtained by conducting artificial spawning in aquaculture conditions. When fish are bred in captivity, it is important to select breeding pairs that will produce the most genetically diverse progeny, since this permits maintaining the fitn...

This study examined the effect of dietary carotenoid availability on carotenoid and retinoid concentrations in the flesh, plasma, skin and eggs of female Chinook salmon Oncorhynchus tshawytscha. Carotenoid concentrations in all tissues were closely related to dietary availability. Early in the breeding season, carotenoids were stored primarily in the muscle, with a flesh carotenoid concentratio...

Acknowledgments: the work of Carmelo Maucieri was supported by Cost Action FA1305 “The EU Aquaponics Hub; Realising Sustainable Integrated Fish and Vegetable Production for the EU” grant COST-STSM-ECOST-STSM-FA1305-011016-080268 and by a Department of Agronomy, Food, Natural resources, Animals and Environment research grant “Aquaponic Sustainable management of aquaculture effluent as an unconve...

--A field experiment, offering a choice of two prey fish of unequal sizes to foraging Bald Eagles (Haliaeetus leucocephalus), was devised. The objective of the field experiment was to determine if eagles preferred one prey item over another, and if this preference varied between breeding and non-breeding seasons. A total of 67 trials were conducted on four nesting pairs of eagles, 32 trials in ...