شماره مطلب: 460

The behavioral mechanism of competition for food between tilapia (Oreochromis hybrid) and crayfish (Cherax quadricarinatus)

نویسنده: 
Assaf Barki
انتشارات: 
elsevier
تعدات صفحات: 
6
Studies on polyculture have usually investigated the consequences of this widespread culture method for growthand survival of the cultured species. However, research into the behavioral mechanism underlying competitionbetween co-cultured species is lacking. For the first time in co-cultured fish and crustaceans, this study exploredexperimentally the behavioral interaction between red tilapia and red-claw crayfish in the context of foodcompetion. The effects of the presence of heterospecifics (absent or present), the size of fish relative to crayfish(larger or smaller) and the number of food patches available for the fish (one- versus two-patch conditions)on the foraging decisions and aggression of fish and crayfish were tested. Time spent by fish in the bottomfood patch (accessible for fish and crayfish) was shorter in the presence of crayfish, for small but not large fishand when there was an alternative patch for the fish (accessible only for fish). Time spent by crayfish in the bottomfood patch was reduced in the presence of large, but not small, fish and when there was no alternative foodpatch for the fish. Fishwere most aggressive towards conspecificswhereas interspecific aggression was exhibitedonly by crayfish. At the individual level, the dominant fish and crayfish spent more time in the bottompatch andperformed more aggressive actions than the other conspecifics. In fish, this was not altered in the presence ofcrayfish. In crayfish, the overall reduction in foraging duration and aggression was due to an effect of large fishon the dominant individual. The implication of these findings for fish–crayfish communal culture is discussed.
حجم: 
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