نتایج جستجو برای: gonadosomatic index
تعداد نتایج: 396097 فیلتر نتایج به سال:
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 ...
Many studies about endocrine pollution in the aquatic environment reveal changes in the reproduction system of biota. We analysed endocrine activities in two rivers in Southern Germany using three approaches: (1) chemical analyses, (2) in vitro bioassays, and (3) in vivo investigations in fish and snails. Chemical analyses were based on gas chromatography coupled with mass spectrometry. For in ...
Information on the spawning migration, spawning ecology and life history of tropical eels in the Indo-Pacific region is very limited. The physiological and morphological characteristics of tropical freshwater eels, Anguilla bicolor bicolor and A. bengalensis bengalensis collected in Malaysia were examined in relation to their downstream migration patterns. A total of 455 eels were collected ove...
Golden barb (Barbus luteus) 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 reduction of the population of golden barb. Therefore, to restore the natural stock of this species, identifying its reproductive cycle associated with its habitat is of a ...
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...
background: phenol is an estrogenic and toxic compound and people are widely exposed to it, in different ways. objectives: the aim of this study was to determine the negative effects of phenol on the fertility of male mice, by investigating sperm parameters including viability, motility, fertility rates and daily sperm production (dsp). methods: a total of 106 adult nih mice were divided int...
In regarding to study the effect of biological parameters of female rainbow trout (Oncorhynchus mykiss) brood stocks on girt, 30 specimen of rainbow trout brood stocks were selected from 3 different age class (3, 4, 5 years). The results showed, maximum of girt 36.35± 0.35cm , ovary weight 600±11.25 gr, hatching 90±4 % and larvae weight after hatching 0.15±0.01 were in 5 and 3 years old brood s...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید