Croaker's fertilised eggs come from 1.7-2.4 kilogram reproducers. (Photo: Ifapa)
'Second generation' croaker fry obtained
Friday, June 21, 2013, 00:30 (GMT + 9)
Scientists at the Research and Training Institute for Agricultural and Fisheries of Andalusia (Ifapa) managed to obtain 'second generation' croaker fry, that is to say, they were born from specimens that had been bred in captivity.
This is an unprecedented development in Andalusia, which took place in Ifapa Centre El Toruño, located in El Puerto de Santa María (Cádiz).
According to the territorial delegate, Federico Fernández, "not only is it an Andalusian level achievement but a national success," since in the Centre El Toruño second generation eggs were obtained with younger specimens than in other research and development centres in the country.
The researchers detailed the croaker’s fertilized eggs are from 1.7 to 2.4 kilograms obtained in the centre of Cadiz in 2009 by breeding techniques in aquaculture.
The advantage of these reproducers is that they require less weight and age to reach sexual maturity. This translates into a higher likelihood for them to reproduce, which results in savings as to time and money.
The experts explained that marine farmed fish are more precocious than the wild ones because their "designed" diet is more complete and offers better quality.
The domestication of the croaker favours and optimizes production control, thus achieving a significant increase in profitability, stressed the Andalusian local government.
The reproduction of 'second generation' was made possible thanks to the hormonal induction technique of the croaker.
The Centre El Toruño has 25 years’ experience in the seafood sector, in the cultivation of more than a dozen aquaculture species (sole, bream, sea bass, croaker, grouper, sea bream, snapper and striped mullet, among others) and the use of molecular markers in the traceability of fishery and aquaculture products.
At present, its experts are conducting research on microalgae and larval nutrition, physiological welfare gains and immunity of marine fish, and species diversification and improvement programmes.
By Analia Murias