Studies On The Growth Of Juvenile Lamprotula Fibrosa Under Different Conditions And The Change Of Morphology Of The Shell

We studied the growth of the juvenile mussels of Lamprotula fibrosa which were cultivated in the cement pools or ponds under different conditions of density , height of water and substrate. The resultes showed that the growth current of the juvenile mussels of Lamprotula fibrosa which were cultivated in the ponds was nearly the same as that in the cement pools, but the former grew faster than the latter, which were showed from the juveniles' shell length (S_L) , shell height (S_H) , shell width (S_W) and body weight (W). In both the two types of ponds, the relationships between Sl, Sh, Sw and were linear correlated. The relationships between S_L, S_H, S_W and W all are greatly correlated.The equationes of regression in the cement pools respectively are: S_H=0.7726S_L-0.1585 (R~2=0.9960)S_W=0.4785S_L-0.0713 (R~2=0.9857)W=0.0042S_L~2-0.0194S_L +0.0125 (R~2=0.8964)S_W=0.6204S_H+0.024 (R~2=0.9930)W=0.0069S_H~2-0.0231S_H +0.0105 (R~2=0.9323)W=0.0156S_W~2-0.0295Sw +0.0081 (R~2=0.9921)The equationes of regression in the ponds respectively are: S_H=0.7652S_L-0.2348 (R~2=0.9959)S_W=0.4312S_L-0.0959 (R~2=0.9867)W=0.0042S_L~2-0.0264S_L +0.0252 (R~2=0.8891)S_W=0.5643S_H+0.0335 (R~2=0.9933)W=0.0071S_H~ 2-0.032S_H +0.0222 (R~2=0.9244)W=0.0202S_W~2-0.0467Sw +0.0176 (R~2=0.9875)The growth of shell length (S_L), shell height (S_H), shell width (S_W) and body weight(W) of the juveniles cultivated under the density of 4.8×10~4/m~2 were spectacularly slower than that of 0.9×10~4/m~2, 1.8×10~4/m~2, 2.4×10~4/m~2 and 3.6×lOVrn2, but there were not great difference from 0.9 X 104/m2 to 3.6 X 104/m2; and that cultivated in the height of water of 80cm were faster than that of 40cm and 20cm, while the latter two there were not great difference between each other; and that cultivated in ponds with yellow upland soil are spectacular faster than that with pond organic sullage, while the juveniles cultivated with coarse sand substrate all were dead.Besides, we also took a tentative studies on the variations of morphology of the one-year juvenile mussels which were cultivated under controlled condition. The studies include the shape of mussel, growth rings, the coast rings, tumor-like knot, joint and little spines of the exterior part and the muscle signs of coat film, forside close-shell muscle and tail close-shell muscle, main tooth of initation and proflic tooth of the interior part.