in the present study, some biological aspects of capoeta trutta (heckel, 1843) have been examined for the aim of future stock assessment, exploitation and conservational managements. a total of 103 fish specimens were collected seasonally from seymareh river, tigris basin, iran, in four seasons during 2011-2012. observed maximum age was 4 + in both sexes and sex ratio obtained as 1m:1.9f. analy...

background: heroin as opium is being used in two pure and impure forms with known disastrous effects on different body organs including genital system. the aim of this study was to determine the changes in testosterone secretion, the percentage of fertility, changes of the body and testis weight, and gonado somatic index in mice (ballb/c). materials and methods: a total of 90 adult male and fem...

Morphometric of examination gonads Liza carinata were performed for one year (October 1995 – September 1996) to study the maturation development. Monthly variation in gonado somatic index (GSI) noticed, that started with low values during October and November. Significant increase was recorded period December - April peak February (3.59 males & 9.33 females) followed by a significant declin...

The silver catfish, Chrysichthys nigrodigitatus (Lacépède: 1803) is a highly valued food-fish included among the dominant commercial catches exploited in major rivers of Africa. To provide useful biological data for management, samples were collected monthly between January (2005) and December (2007) in three zones: I: Upper Cross River (grassland), II: Middle Cross River (mixed forest and gras...

Life history plasticity can be a strong predictor of the establishment and invasion success introduced fishes. Here, life-history traits four P. parva populations in adjacent ponds Southern England were measured throughout 2013 to determine timing length their reproductive season extent trait plasticity. The relative abundance (as catch per unit effort) was similar, with low variability relatin...

Japanese Threadfin Bream is a demersal fish commonly found around artificial reefs. Food availability in the reef ecosystem essential for sustainability of this species. Hence, research aimed to determine several aspects bio-reproduction caught (bioreeftek). Samples were taken using handline fishing, twice month (April-July 2020) Pitu Sunggu Waters, Makassar Strait. The samples observed its rep...

This study was conducted to assess the reproductive biology and early breeding behaviour of female Oreochromis niloticus reared in monoculture and polyculture with Clarias gariepinus in earthen ponds for 8 months. Results revealed no significant difference in length at first maturity (L50) between females reared in monoculture and polyculture systems. Similarly, no significant differences were ...

The present study was carried out from December 2007, during which to November 2008 more than 210 fish (Barbus barbulus) were caught and measured, including, 57 males, 64 females 89 immature fishes. Maximum minimum total lengths 885 mm respectively. weight 8460 g 99 length-weight relationship Y=0.00002 L2.90 (n=57, R2=0.85) for Y=0.000002 L3.22 (n=64, R2=0.87) Y=0.00005 L2.96 (n=210, R2 =0.90) ...