Attracting Effects Of10Kinds Of Substances And Its Farming Application Effects On Loach

The research studied the baiting effects of10kinds of attractants (betaine, DMPT,TMAO, taurine, sodium glutamate, squid paste, earthworm meal, garlic meal, orange peelmeal and phellodendron amurense meal) on Loach (Misgurnus anguillicaudatus) by usingfish ingestion behavior gathering method, and the optimal concentration of each attractantwere figured out through replicates and comparisons. Six attractants with better baitingeffects were compounded to20kinds of composite materials by using C63method. Eachgroup of composite was mixed with attractants at the optimal concentration. The bestcomposite attractant was further selected. The effects of each attractants on Loach wereevaluated with the indexes of weight gain rate (WGR), specific growth rate (SGR) andfeed conversion rate (FCR) after63days feeding. The following results were concluded:1. The fish collecting effects of10kinds of substances on LoachAccording to the single-factor design, the number of attracting fish was used toevaluate the fish collecting effect of10kinds of substances (betaine, DMPT, TMAO,taurine, sodium glutamate, squid paste, earthworm meal, garlic meal, orange peel meal andphellodendron amurense meal) on Loach. The results showed that：10kinds of singleattractant all have significant (P<0.05) baiting effects on Loach. The optimal concentrationof each attractant are: betaine0.6%, DMPT0.06%, TMAO0.65%, taurine0.55%, sodiumglutamate0.05%, squid paste0.5%, earthworm meal1.5%, garlic meal0.05%, orange peelmeal0.5%, phellodendron amurense meal0.70%(P<0.05). The baiting effects of diaryfeed with0.5%orange peel meal was significantly higher than other9kinds of singleattractant (P<0.05).2. The fish collecting effects of20kinds of compounds on LoachAccording to the results above, screen6kinds of substances with better fish collectingeffect. And then compound them to20kinds of composite materials by using C63method.The number of attracting fish was used to evaluate the fish collecting effect of20kinds ofcompounds on Loach. The results showed that: Three kinds of composite attractants whichhave a significant (P<0.05) baiting effects on Loach are: S1(0.55%taurine+0.06% DMPT+0.7%phellodendron amurense meal), S14(0.06%DMPT+1.5%earthwormmeal+0.5%orange peel meal) and S19(0.7%phellodendron amurense meal+0.5%orange peel meal+0.05%sodium glutamate).3. The farming application effects of8kinds of attractants on LoachThe Loachs with approximate initial weight of4.32±0.02g were fed under watercirculating system for63days to study the effects of8kinds of attractants on their growth,shape indicators and muscle formation. The8kinds of attractants are:0.06%DMPT,0.7%phellodendron amurense meal,1.5%earthworm meal,0.55%taurine,0.5%orange peelmeal,0.06%DMPT+1.5%earthworm meal+0.5%orange peel meal,0.7%phellodendron amurense meal+0.5%orange peel meal+0.05%sodium glutamate, and0.55%taurine+0.06%DMPT+0.7%phellodendron amurense meal. The results indicatedthat the FCR of treated groups are significantly lower than that under the controlled group(P<0.05). The final average weight, WGR, SGR of treat Ⅴ group were significantlyhigher than CK (P<0.05), which indicate that adding0.5%orange peel meal to the dailydiet should be the most suitable attractant for Loach feeding.