نتایج جستجو برای: spermiation

تعداد نتایج: 230  

Journal: :Fisheries and Aquatic Sciences 2021

Roughscale sole (Clidoderma asperrimum) is only wild caught because basic reproductive research on this species lacking and gamete production in an artificial setting has not been successful. Exogenous hormone treatment used to induce gonadal maturation final spermiation wild-caught individuals. In study, the effects of exogenous roughscale was investigated by implanting different concentration...

2003
J. M. BEDFORD

Spermatozoa of the shrew Suncus murinus, a mammal with abdominal testes, exhibit four unusual features: a giant acrosome; a dorsoventral asymmetry of their spermiation; a dorsoventral asymmetry of their head surface character; and also apparent surface maturity as they enter the epididymis. A Sertoli cell-periacrosomal cisternal complex envelops the giant acrosome during spermatid maturation. S...

Journal: :Aquaculture 2021

This study investigated the influence of long-term T and 11-KT administration (by means an implant) on synthesis release gonadotropins (Fsh, Lh) spermatogenesis progression in juvenile male sea bass exposed to either a natural photoperiod (NP) or continuous light (LL). The results control group indicated clear role for Fsh recruitment type-A spermatogonia (SPGA) towards more advanced stages und...

Journal: :Chronobiology international 2009
Maria Jose Bayarri Silvia Zanuy Ozlem Yilmaz Manuel Carrillo

The European sea bass is a short-day breeder, a characteristic that is highly valued in aquaculture. A high percentage of males of this species mature precociously before reaching commercial size, resulting in economic losses for fish farmers. We investigated the effects of continuous light (LL) on the circadian variations of several reproductive hormones in males of this species in order to un...

Journal: :Mediterranean Marine Science 2021

We examined the effect of constant water temperature throughout year on gametogenesis, spawning success and egg/sperm/embryo quality in meagre (Argyrosomus regius). Two broodstocks were exposed to simulated natural photoperiod, andeither attenuated seasonal (SeasT, 16.4 19.6ºC) or relatively (CoT, 19.4 ± 0.6ºC).In period (May), 4 couples per group induced spawn with gonadotropin releasing hormo...

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