福寿螺和克氏原螯虾摄食水花生和水浮莲初探

Study on Consuming Alternanthera philoxeroides and Pistia stratiotes of Ampullaria gigas and Procambarus clakii

研究了福寿螺和克氏原螯虾对水花生和水浮莲的摄食情况。结果表明,每只体重1.06±0.09g福寿螺对水花生和水浮莲的摄食率分别为17.37±0.73%、22.30±0.84%;每只体重3.52±0.07g的摄食率分别为13.66±0.79%及13.84±0.67%。雌、雄克氏原螯虾对水花生的摄食率分别为1.28±0.04%和0.74±0.03%;对水浮莲的摄食率分别为2.10±0.04%和1.93±0.05%。

The paper studied daily rations of apple snails with different body weights and crayfishes fed with alligator weed and Pistia stratiotes indoor. Daily ration of apple snails with 1.06±0.09g/per snail fed with alligator weed and Pistia stratiotes was 17.37±0.73%, 22.30±0.84% respectively; that of apple snails with 3.52±0.07g/per snail was 13.66±0.79%, 13.84±0.67% respectively. Apple snails had higher growth velocity and lower feed coefficient when fed with Pistia stratiotes than fed with alligator weed （P〈0.01）. Daily ration of female and male crawfish fed with alligator weed was 1.28±0.04%, 0.74±0.03% respectively; that of female and male crawfish fed with Pistia stratiotes was 2.10±0.04%, 1.93±0.05% respectively.