Life cycle and feeding habits of the threespined stickleback Gasterosteus aculeatus (Linnaeus, 1758): an alien species in the southeast Caspian Sea.
作者： Hamid Niksirat , Asghar Abdoli , Azadeh Hatef
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摘要: The feeding habits and life cycle of a population the alien threespined stickleback Gasterosteus aculeatus, were studied in southeast Caspian Sea from December 2000 to November 2001 evaluate its potential impact on indigenous commercial species. abundance (A%) occurrence (O%) prey items G. aculeatus stomach content calculated for Gammarids, Nereis sp., Chironomidae, fishes, Oligochaeta, fish eggs, Hirudinea. effects sticklebacks juvenile Persian Russian sturgeons discussed. gonadosomatic index female showed that breeding season began at March lasted five months Sea. condition factor, somatic hepatosomatic increased beginning spawning decreased with progress. A significant negative correlation between factor females indicates priority reproduction over growth; this can help species rapidly increase size, thus enhancing impacts fauna. similar or even higher mean weight length study area comparison other native populations might imply suitable conditions establishment
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