Studies in non-teleost vertebrates have found microRNAs (miRNAs) to be essential for proper gonadal development. However, comparatively little is known about their role during gonadal development in teleost fishes. So far in zebrafish, a model teleost, transcript profiling throughout gonadal development has not been established because of a tiny size of an organ in juvenile stages and its poor ...

The present study was undertaken to unders the properties and origins of the bitter substance in the sea urchin gonads and the relationship between maturation and their contents. The frequency of occurrence of bitter-tasting sea urchins collected in the sea off Iwaki, Fukushima Prefecture was examined first. The bitterness was found to be specific to mature ovaries. From the mature ovaries, a b...

The effects of dietary fatty acids on the composition of Paracentrotus lividus gonads were investigated to determine whether dietary inputs affect their relative abundance during gametogenesis. Egg and embryo FA compositions were compared with that of mature gonads to understand how maternal FA is transferred to the offspring. Urchins were fed an experimental Pellet diet in comparison to brown ...

The box jellyfish Chiropsalmus quadrumanus (Chirodropida: Cubozoa: Cnidaria) is common in warm waters. Although it assumed that external fertilization a characteristic of Chirodropida, the life history C. not yet known since its reproductive behavior has never been described, nor polyp found nature. As result, absence documentation behavior, we sought to test hypothesis through histological ana...

BACKGROUND The Pacific oyster Crassostrea gigas (Mollusca, Lophotrochozoa) is an alternative and irregular protandrous hermaphrodite: most individuals mature first as males and then change sex several times. Little is known about genetic and phenotypic basis of sex differentiation in oysters, and little more about the molecular pathways regulating reproduction. We have recently developed and va...

Coral spawning occurs throughout the year in Indonesia due to tropical climate conditions that influence coral development and spawning. As representative data on gonad Spermonde Archipelago, observations of Faviidae gonads were conducted Barrang Lompo, Kodingareng Keke, Samalona, Bonetambung Island. Environmental elements are measured form surface water temperature rainfall. Based abundance th...

Samples of Alburnus mossulensis were collected from the south part Euphrates River, Chybaish, Iraq November 2013 to October 2014 using electro fishing. The spawning period started in February according GSI values and histological examination for gonads during season. results examinations revealed that this species has a short season female ovaries contained different maturing stages ova, matura...

Sturgeons are known throughout the world as the source of black caviar. Their declining populations in their native habitats, mainly the Caspian Sea, due to over-fishing for meat and caviar production, destruction of their spawning grounds and water pollution, have led to their introduction into aquaculture in areas with suitable conditions, including Israel. Recently, we noticed an unusual phe...

The sexual plasticity of the gonads is not retained after the completion of sex differentiation in vertebrates, except in some hermaphroditic species. Here, we report that the depletion of estradiol-17β (E2) by aromatase inhibitors (AI) for up to six months resulted in a functional female-to-male sex reversal in sexually-mature adults of two gonochoristic fish species, Nile tilapia and medaka. ...