Abstract:

In order to study the trapping effect on juveniles of Culter alburnus, five artificial reefs with different structures were adopted: square whole reef (T1 type), triangular whole reef (T2 type), square box reef (X1 type), triangular box reef (X2 type) and cube reef (F1 type). The effects of different artificial reef models on the behavior and distribution of juvenile Culter alburnus were observed through indoor simulation experiments. The test results showed that: in the control group without artificial reefs, the juveniles of Culter alburnus were clustered on both sides; the five artificial reef models placed all had a certain trapping effect on the juveniles of Culter alburnus. The T2 type artificial reef model with the most suitable available space, easy passage and the best covering effect had the best trapping effect on the juveniles of Culter alburnus. The trapping effect of F1 and T1 decreased with the weakening of the trapping space and the shielding effect of the reef model; and the trapping effects of the box design of X1 and X2 artificial reef models were not as good as that of the first three reef models. But according to the analysis of the test results, there was no significant difference in the trapping effect of the five artificial reef models on the juveniles of Culter alburnus (P>0.05). The differences of the trapping effects of the five artificial reef models on the juveniles of Culter alburnus may be caused by the combination of the structural differences of the reef models and the habits of the juvenile Culter alburnus. The T2 artificial reef model can be widely used.

Key words: artificial reef, trapping effect, indoor reef simulation experiment, Culter alburnus, average distribution rate