In the present study, the effect of successive milt collection was investigated on spermatological parameters and reproduction successes of wild and cultured endangered caspian brown trout. The milt collection was done 3 times with two weeks intervals. After milt collection, amount of milt was allocated for milt quality evaluation and reminders used for fertilization. According to results, in w...

In the present study, the effect of successive milt collection was investigated on spermatological parameters and reproduction successes of wild and cultured endangered caspian brown trout. The milt collection was done 3 times with two weeks intervals. After milt collection, amount of milt was allocated for milt quality evaluation and reminders used for fertilization. According to results, in w...

Ž . Reproductive performance of male European sea bass Dicentrarchus labrax fed a wet diet Ž . WD was compared to that of fish fed two commercial pelleted diet enriched with polyunsatuŽ . Ž . Ž . rated fatty acids PUFAs by the use of Northern hemisphere fish oil ST or tuna orbital oil RO . Broodstock growth, spermiation duration, milt production, milt spermatozoa density, sperm motility, milt l...

Previous studies have indicated that salmonid fertilization success may be very sensitive to elevated concentrations of total dissolved solids (TDS) with effects at concentrations as low as 250mgl(-1) being reported. However, interpretation of these studies is complicated by poor control performance and variable concentration response relationships. To address this, a series of experiments were...

Darters (Percidae: Etheostomatini) offer attractive opportunities for analysis of the evolution of reproductive barriers and the molecular basis of fertilization. Here we report some basic characteristics of the sperm of darters, and, to our knowledge, the first report of sperm associated -L-fucosidase in fishes. Fluorometric enzyme assays using 4methylumbelliferyl-alpha-L-fucopyranoside [4-MU-...

M74 syndrome is a thiamine responsive disease of Baltic salmon (the Baltic group of Salmo salar L.) leading to the death of nearly all yolksac fry of certain females (see e.g. Koski et al. (1999)). Börjeson et al. (1995) reported that M74 syndrome in Baltic salmon in Swedish rivers was bound to the females, while milt from wiggling males – fish showing symptoms of a thiamine related-illness (La...

To date, cultivated male Japanese eels have not matured sexually in captivity under normal conditions. However, spermatogenesis and spermiation can be induced by the injection of gonadotropins. During this study, most males spermiated after the fifth or sixth weekly injection of human chorionic gonadotropin (HCG; 1 IU/g BW/wk) and the milt weight gradually increased as the number of injections ...

Spermiation was stimulated in the mature grass puffer, Takifugu niphobles, with an injection of human chorionic gonadotropin (HCG) or carp pituitary extract (CPE). Spermatocrit and sperm density were reduced, but milt production was increased in both the HCG and CPE treatment groups relative to those in the control group (P <0.05). These results should be useful for increasing the fertilization...

Preserved fish eggs can be used in many applications including artificial propagation and genetic studies. The aim of this study was to determine the effects of different temperatures and storage periods on fertilization and hatching success of short-term preserved scaly carp (Cyprinus carpio) eggs. Eggs were kept in 4 ml ovarian fluid in 10-cm petri dishes that were stored in a refrigerator at...

The maintenance of the endangered Caspian brown trout Salmo trutta caspius populations in Iran depends on its artificial breeding. There is no information on how current hatchery breeding protocol influences effective population size of breeders (Ne), which is a critical parameter to maintain genetic diversity in future generations. The current hatchery protocol (CHP) was comparatively evaluate...