11 research outputs found
Three strategic feeding during hatchering of Nile tilapia: effects on organs integrity, parasitism and performance parameters
Seasonal changes in the somatic indices of the freshwater silverside, Odontesthes bonariensis (Teleostei, Atheriniformes) from a Neotropical shallow lake (Argentina)
Medium composition for effective slow freezing of embryonic cell lines derived from marine medaka (Oryzias dancena)
High levels of docosahexaenoic acid are present in eight New World silversides (Pisces: Atherinopsidae)
Gonadossomatic relation and reproductive strategy of Brycon opalinus (Cuvier, 1819) in the Serra do Mar State Park - Núcleo Santa Virgínia, Atlantic Forest, Brazil
The objective of this study was to analyze the gonadossomatic relation of males and females of Brycon opalinus (the Pirapitinga do Sul) in the Serra do Mar State Park-Núcleo Santa Virgínia. The study area included three rivers: Paraibuna, Ipiranga, and Grande. From the gonadossomatic relation, it was possible to determine the reproductive season and strategy of this species. The gonadossomatic relation was high throughout the year for both males and females. Sperm competition and dilution of the ejaculate in the spawning locations favored substantial development of the testicles. The sex ratio of Brycon opalinus was always in favor of females. The existence of sexual dimorphism in this species was confirmed from the larger size of the females
Effectiveness of estradiol valerate on sex reversion in Astyanax altiparanae (Characiformes, Characidae)
Effects of delayed first feeding on growth of the silver catfish larvae Rhamdia voulezi (Siluriformes: Heptapteridae)
Advantages and Applications of Cryopreservation in Fisheries Science
Cryopreservation is a long-term storage technique to preserve the biological material without deterioration for extended period of time at least several thousands of years. The ability to preserve and store both maternal and paternal gametes provides a reliable source of fish genetic material for scientific and aquaculture purposes as well as for conservation of biodiversity. Successful cryopreservation of fish sperm have been achieved for more than 200 fish species and many fish species have been adequated for the purpose of cryobanking. Cryopreservation of fish embryo is not viable, mainly because of the same limitations as in fish oocytes, i.e., high chilling sensitivity and low membrane permeability. However, cryopreservation of isolated embryonic cells is another option for preserving both maternal and paternal genome. In this paper, an overview of the current state of aquatic species is followed by a discussion on the sperm, embryos, oocytes and embryonic cells - blastomeres