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Triploidization: a method to alleviate maturation of large-size fish

AuthorsFelip, Alicia
Issue Date21-Jun-2015
CitationThe International Symposium on Genetics in Aquaculture XII (2015)
AbstractThe most important feature of triploids is their sterility. Normal gametogenesis does not occur in triploids and thus, energy that they do not divert to reproduction is available for somatic growth. However, it is known that performance of triploids is species specific. Nevertheless, since sexual maturation is often considered as a problem in fish, due to it perturbs growth and product quality, induced sterility could be an effective method to solve these problems. In this context, triploidization might satisfy the demand for large-size fish as there is an increasing interest and willingness to pay for value added product forms. It can be the case of the European sea bass (Dicentrarchus labrax L.), a highly-prized marine teleost in Mediterranean areas that attains puberty at 2 years of age in males and around 3¿4 years in females, after which time it reproduces once a year during the winter (December-March). Although sea bass is still almost sold as whole fish (350-400 g fish), the production of big-sized fish (more than 24 months of age and 2 Kg) is starting to make an appearance. Induction of triploidy in the sea bass using cold shocks (0ºC), 5 min after fertilization and duration of 10 min has demonstrated that meiosis is completely altered in both sexes and they do not produce mature gamete, thus conferring functional sterility in the fish. Of note, while older triploids retain impaired reproductive endocrinology, a sexually related dimorphic growth is observed with triploid females attaining the largest sizes. These observations indicate that triploidy could be an interesting option for fish aquaculture, especially for the production of large-size sea bass including Royal sea bass (> 1 Kg) and Imperial sea bass (> 3 Kg). It would be better valuated and not affected by complications related to sexual maturity, thus following consumer and market requirements. Together, triploidization might be considered an approach for the reproductive and biological containment while it alleviates sexual maturation and satisfies the demand for larger market size production.
DescriptionComunicación presentada en The International Symposium on Genetics in Aquaculture XII, celebrado en Santiago de Compostela, España, del 21 al 27 de junio de 2015
Appears in Collections:(IATS) Comunicaciones congresos
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