the effectiveness of pituitary extract from crucian carp (carassius auratus linnaes 1758) in inducing ovulation in veil tail gold fish (carassius auratus gibelio bloch 1783), was examined and the effect of maternal hormone treatment on egg quality in two types of fertilization (fertilization in aquarium and artificial fertilization), were evaluated in 22·c temperature. fish were injected intrap...

The ongoing rapid climate change, combined with the disturbance of fish breeding grounds, may impact reproduction by endangering successful and survival, thus affect viable sustainability in aquaculture systems as well sea. In this study we focus on biocomplexity response to change. Further, propose adaptive strategies, including technological advancements, using a noninvasive non-lethal approa...

introduction: nowadays, the healthiness and high quality as well as quantity of aquatic are of great importance and the role of diet components is well recognized (20). fish needs energy and nutrients in order to achieve desirable level of growth and development and reproduction (11). in recent years application of immune system stimuli has been widely adopted in order to enhance the immune sys...

In the early 80-ies of last century, there was a sharp decline in population Caspian beluga Russia. Its fishing prohibited, except for catching reproduction and scientific purposes. practice sturgeon breeding, method repeated use females males by obtaining sexual products vivo, as well growing breeders artificial conditions, has become widely put into practice. Against background an acute short...

We used genetic parentage analysis of 6200 potential parents and 5497 juvenile offspring to evaluate the relative reproductive success of hatchery and natural steelhead (Onchorhynchus mykiss) when spawning in the wild between 2008 and 2011 in the Wenatchee River, Washington. Hatchery fish originating from two prior generation hatchery parents had <20% of the reproductive success of natural orig...

We consider a cooperatively breeding group and find the optimal pattern of reproductive parasitism by a subordinate helper as a function of its body size, and hence the share of reproduction obtained by the subordinate. We develop the model for the social system of the cooperatively breeding cichlid fish Neolamprologus pulcher but the general framework is also applicable to other cooperative sy...

The world's demand for fish products food and industrial purposes has already significantly exceeded the reproduction capacity of wild fish. Further increasing exploitation natural populations leads to a sharp reduction in their numbers degradation population biodiversity. only way solve problem is develop artificial This applies primarily salmon, which are most valuable popular types In Murman...