Abstract
Four different wreckfish (Polyprion americanus) broodstock batches were maintained in research facilities under different photo and thermo-period conditions, one in Greece, the Helenic Center for Marine Research (HCMR, n = 3) and three in Spain: Instituto Español de Oceanografía (IEO, n = 13) in Vigo, Aquarium Finisterrae (MC2, n = 21) in A Coruña and Consellería do Mar (CMRM, n = 11). The CMRM includes two centers that work together: Instituto Galego de Formación en Acuicultura (IGAFA) and Centro de Investigacións Mariñas (CIMA), both in Pontevedra. During the five years of the project DIVERSIFY (Exploring the biological and socio-economic potential of new-emerging candidate fish species for the expansion of the European aquaculture industry, 2013–2018) works focused on the reproductive biology of the species, broodstock, and larvae nutrition and development of incubation and larval rearing protocols have been carried out. In terms of reproduction, catch methods of new wild animals, the reproductive cycle, sperm characteristics evaluation, and spontaneous and induced spawning methods have been described for wreckfish. Regarding nutrition, the positive effect of two types of enrichment on the fatty acid profiles of Artemia and rotifer has been verified. The relationship between the fatty acid profile of the diets supplied to the broodstock and the fatty acid profile obtained in the oocytes and eggs of the females fed with different diets, has also been demonstrated. Finally, early larval ontogeny has been described and incubation and larval rearing protocols have been proposed based on the results obtained in the different experiments of temperature, growth, survival, and larval feeding that were carried out.
Highlights
The 5-years DIVERSIFY project [1] identified a number of new/emerging finfish species with a great potential for the expansion of the aquaculture industry
We provide a global information of the studies carried out during the 5of the DIVERSIFY project, related to the acquisition of new broodstock, control of reproduction, years of the DIVERSIFY project, related to the acquisition of new broodstock, control of reproduction, nutrition, and larval rearing
The results showed that the use of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) stimulated gonadal development [21], but more trials with a greater number of individuals and different hormonal doses are required to verify the effects in wreckfish
Summary
The 5-years DIVERSIFY project [1] identified a number of new/emerging finfish species with a great potential for the expansion of the aquaculture industry. Six species were selected based both on their biological and economical potential: Meager (Argyrosomus regius), greater amberjack (Seriola dumerili), wreckfish (Polyprion americanus), Atlantic halibut (Hippoglossus hippoglossus), grey mullet (Mugil cephalus), and pikeperch (Sanders lucioperca) This new/emerging species are fast growing and/or a large species marketed at a large size and can be processed into a range of products to provide to the consumer. Wreckfish (Polyprion americanus) is one of the largest serranid species, reaching a size of 100 kg It is a deep-water fish found almost throughout the world and is characterized by an extended pelagic juvenile phase [2,3,4].It is one interesting new species for aquaculture, due to its fast growth [5,6], late reproductive maturation [2], high market price and limited fisheries landings—quotas have been reduced by 90% in 2012 in the U.S.A. The description of the reproductive cycle, along with allowing for the identification of the spawning period and spawning preferences of each species (temperature and photoperiod), enables the recognition of possible reproductive dysfunctions and leads to the development of protocols for spawning induction and production of viable eggs [13]
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