The response of male Fundulus heteroclitus to estrogenic compounds was assessed in anticipation of using this species in endocrine disrupter field studies in the Chesapeake Bay. Measurements of plasma vitellogenin, gonadosomatic (GSI) and hepatosomatic (HSI) indices, and an assessment of changes in gonadal histology were made. Of the parameters assessed, vitellogenin was found to be the most se...

The gonadosomatic index (GSI), gonadal development and changes in hormones in plasma level of the indoor cultured grunt (Hapalogenys nitens) were investigated by histological study from August 2011 to October 2012. The GSI showed similar trends with gonad developmental stages during the culture periods. Changes in plasma level of estradiol-17β of female H. nitens reached the highest value befor...

Rearing experiments were conducted using several regimes combined with different photoperiods and water temperatures to investigate the role of temperature and photoperiod as environmental cues regulating reproduction in red marbled rockfish, Sebastiscus tertius. The initial gonadosomatic index (GSI) was 1.62±0.32% and that in the 15°C control was 7.01±0.46% at the end of the experiment. The hi...

shirbot ( barbus grypus ) is one of the species in south and southwest of iran which is greatly favorable to residents of the region. unfavorable ecological conditions in habitat of this species and overfishing have led to the reduction of the population of shirbot. therefore, to restore the natural stock of this species, identifying its reproductive cycle associated with its habitat is of a gr...

This study aimed to assess the effects of 17α-methyltestosterone (MT) on growth and reproductive performance male Asian catfish (Clarias macrocephalus). A total 36 immature (ABW = 125.97 g) were randomly distributed into 12 circular tanks, fed with either control diet (with no MT) or diets containing MT at 60 mg·kg-1, 90 120 mg·kg-1 for 45 days. Results showed that weight gain (WG), specific ra...

Effective fisheries management depend on having an exact assessment of biological parameters, including growth reproduction, size at sexual maturity ( L m ), and stock assessment. The purpose this research was to estimate the ) for 20 fish species belongs 14 families from a wetland (Gajner Beel ecosystem in north-western (NW) Bangladesh through multi-models such as length max based empirical mo...

The European sardine’s condition is reflected in its reproductive potential, and therefore, status as a fishery resource. These values depend on the stock’s distribution resource availability, which highly determined by environmental characteristics. Sardines from productive Gulf of Trieste (in North Adriatic), located northernmost section most septentrional Mediterranean sub-basin sardine expl...

Knowledge on the reproductive biology of endemic clupeids Limnothrissa miodon and Stolothrissa tanganicae, two main target species pelagic fisheries Lake Tanganyika, is constrained by fragmented monitoring activities. Here, we investigate nursing areas L. miodon, timing activities littoral S. tanganicae in Congolese waters northern end Tanganyika (Bujumbura sub-basin). Nursing were determined y...

Feral raccoons (Procyon lotor) have been growing in number in Japan, and they are becoming a problematic invasive species. Consequently, they are commonly captured and killed in pest control programs. For effective population control of feral raccoons, it is necessary to understand their reproductive physiology and ecology. Although the reproductive traits of female raccoons are well known, tho...

In this study, it was aimed to analyses some growth parameters of the invasive Diadema setosum (Leske, 1778) from Iskenderun Bay. For reason, a total 117 samples were collected in September 2021 rocky shores coast Iskenderun. The test diameter D. varied between 24.32 and 81.1 mm with an average 51.8±1.18 length. weight changed 27.14 185.11 g, 84.64±2.77 g. length-weight relationship W = 0.7917*...