The cycle of gonad development and related changes in the length structure and spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.) in Puck Bay were studied. Observations were carried out in the shallow shore zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks reproduce in the brackish environment of Puck Bay, breeding in its warmer, in...

abstract relation between sexual maturity and levels of two main steroid hormones in gonads, 17- estradiol (e2) and testosterone (t) were studied by using histological and radioimmunoassay in female kutum rutilus frisii kutum during spawning season of the southern caspian sea. the study was carried out from february to may 2008 using 105 migrated fish specimens catched from the river sefid-rood...

The necessity for tuna products in the world community continues to increase, while production relies only on catching, thus causing overfishing. Therefore, breeding technology support farming is fundamental be developed. Yellowfin Indonesia has been successful cultivating broodstock. This paper discusses biometric data that changes during cultivation, such as condition factor, hepato and gonad...

This study was performed to obtain information on the sex ratio, spawning period, and size at sexual maturity for fishery management of largehead hairtail Trichiurus japonicus in Korean waters. The overall ratio (female, F; male, M) 1:0.46 (n = 1274 females:589 males, 68.4% female) as fish increased length, proportion females increased. oocyte development pattern group-synchronous development, ...

The Funil Reservoir receives a large amount of xenobiotics from the Paraíba do Sul River (PSR) from large number of industries and municipalities in the watershed. This study aimed to assess environmental quality along the longitudinal profile of the Paraíba do Sul River-Funil Reservoir system, by using biomarkers and bioindicators in a selected fish species. The raised hypothesis is that Funil...

The annual alteration of gonad morphology in sardine (Sardina pilchardus, Walbaum 1792) caught in the period from November 2006 to October 2007 using beach seines in the region of Boka Kotorska Bay (Montenegro, southern Adriatic) was studied. Samples were taken in the middle of each month. Total length of individuals ranged from 8.7 to 14.7 cm and weight ranged from 4.67 to 22.61 g. Their gonad...

An experiment was conducted for 140 days in earthen ponds to evaluate the effect of three dietary protein levels on the growth and maturity of bagrid catfish Mystus gulio. Three different iso-caloric feeds containing 30%, 35% and 40% dietary protein levels were prepared from indigenous fish feed ingredients and were fed to Mystus gulio at the rate of 5% of total body weight of the fish. The ove...

The maturity, sex ratio, gonadosomatic index (GSI) and fecundity of Coryphaena hippurus was investigated from 347 specimens collected along Karnataka coast, south-eastern Arabian Sea August 2017 to May 2018. Overall ratio 1:3.5 (male:female) indicated dominance females in the fishery differed significantly (p<0.05) all months, except January, December. fork length (FL) at 50% maturity (Lm50)...

The purple dye murex Bolinus brandaris is a commercially valuable gastropod in Portugal. However, there is a lack of knowledge on the reproductive cycle in Atlantic populations of this species. In this context, the reproductive cycle of B. brandaris from the Ria Formosa lagoon, southern Portugal, was studied using standard histology and light microscopy and the calculation of bio-physiological ...