| Abstrakt: |
Caucasian scraper (Capoeta capoeta) is one of the native fish of Iran, in the southern basin of the Caspian Sea and Sang Siah Lake of Kurdistan. To study the reproductive cycle of this fish, sampling by gill net was done monthly from June 2018 to May 2019. The biometry of specimen in the Lab was done and sexuality, maturity stages and gonad growth index (GSI) were recorded. The sex ratio of specimen of 1.5 to 1 (female to male), the total length of males 29.3 ± 2.1 cm and the total length of females 32±2.3 cm were recorded. The average weight of males and females were 284.6±50.9 and 378.2±79.3 g, respectively. Also, examining the changes in sexual maturity index (GSI), both sexes had the highest GSI in July. The average relative length of the intestine in this species (6.8±1.29) indicated the herbivorous food regime. The average percentage of empty stomach in the whole period was estimated to be 11.7, which shows that this species is a gluttonous. Also, the highest average amount of gastric index (GI) was estimated in spring. The results of this study showed that July is the peak of sexual maturity and reproduction of this species. Investigation the results of its food habits and preferences in the digestive system showed that this fish prefers algae than other food resources. Due to the high growth and reproduction and also food regime, this fish can be introduced as an economic species to culture and sport fishing in the reservoirs. [ABSTRACT FROM AUTHOR] |
