This study was carried out to determine some reproductive characteristics of the fantail goldfish Carassius auratus females (standard length 69-224 mm. and total weight 21.1- 255.35 g.) from rearing ponds in Basrah province, Southern Iraq. Standard length, weight, gonad absolute fecundity, relative gonadosomatic index (GSI) egg diameter were determined October 2010 April 2011 77 females. Result...

Environmental pollution with natural or synthetic estrogens may pose a serious threat to reproduction of wildlife species. This study describes the effects of 17-alpha-ethynylestradiol (EE2) on fish reproductive organs in a laboratory model. Adult zebrafish were semistatically exposed to nominal concentrations of 0, 10, and 25 ng/L EE2 for 24 d and then transferred to EE2-free medium. Gonadosom...

12 Two large groups of fingerling (3.2g) male European sea bass (around 75,000 13 individuals each) reared in net sea cages for a period of two years were exposed to two 14 different photoperiods starting in June: either ambient photoperiod (37o 24 ́ N) (NP) or a 15 constant long photoperiod (LP; 18 hours light: 6 hours dark, 18L: 6D). Long days had limited 16 effect on somatic growth at the tim...

The reproductive biology of Mugil liza Valenciennes, 1836 is described as a contribution to an elaborate management programm. A total of 243 specimens (89 males and 154 females) were collected in the Sepetiba Bay in south-eastern Brazil from July/2006 to June/2007. The gonadosomatic index (IG) and the sequential development of the ovaries observed through histological studies suggested that the...

The effect of the number of spawnings on several biochemical components of ovary, hepatopancreas, and haemolymph was investigated. Shrimps of two origins were compared; wild-caught and pond-reared spawners. Individually tagged females were sampled at the end of a production period in a commercial hatchery. Females with multiple spawnings had a higher Ž . gonadosomatic index GSI , increased leve...

The African sharptooth catfish (Clarias gariepinus) is indigenous to South Africa where it is commonly found in calm waters such as lakes, streams, rivers, swamps and floodplains. The males of this gonochoristic species can be readily distinguished from females via a distinct elongated urogenital papilla with a pointed tip, located just behind the anus. This structure is an androgen controlled ...

In this study growth and reproductive biology of endemic new species Acanthobrama thisbeae in Sır Reservoir were investigated. The population composed 80.6% female 19.40 % male individuals. individuals' total lengths (mm) weights (g) varied between 130.4 to 260.5 mm 12.92 203.89 g, respectively. Age groups 2 8 identified the majority sample was 130 180 (80.22%). length-weight relationship for a...

In this study, the growth and age characteristics of Okamejei kenojei in West Sea South Korea were examined, specimens collected by bottom trawls from January to December 2019. The relationship between disc width (L) body weight (W) was W = 6.1 × 10−3 L3.40. Age determined measuring annuli on vertebral centrum surface, which forms around June every year. spawning period extrapolated monthly cha...

This study was conducted in fish diseases lab. / College of veterinary medicine/ university Sulaimani to evaluate the effect boiling oak as compared with raw on performance common carp at 0.05 significant level for all studied parameters. carried out C. carpio L. five treatments/ three replicates. The experimental trial consists treatments duplicates, each containing seven fish: Group 1: Diet w...

Histological changes and maturity stages during the reproductive cycle of the ovaries of Klunzinger's Mullet (Liza klunzingeri) were investigated. The evaluation of the spawning season was carried out based on monthly samples from 3 stations in the Persian Gulf and the Oman Sea. Sex ratio was approximately 1:3 (M: F). The maturity stages of female L. Kluningeri are: Virgin, Developing Virgin, D...