Fish passing effect of Angu vertical slot fishway and 1#imitation natural channel
In order to understand the fish passing effect of Angu vertical slot fishway and 1#imitation natural channel,we carry out the pass and turn-back tests of two kinds of fish in two fishways.Taking Onychostoma sima and Hemibarbus labeo as research objects,we install the PIT monitoring equipment in the fishway to record the behavior of two kinds of labeled fish in the vertical slot fishway and 1#imitation natural channel.The results show that 14 species of fish are collected in the fishway during the survey,with a total of 131 individuals,belonging to 2 orders,5 families and 13 genera.The fish in the fishway are mainly Saurogobio dabryi,Zacco platypus,Trilophysa bleekeri and Platysmacheilus nudiventris,accounting for 29.77%,16.79%,16.03% and 12.98%,respectively.During the operation of the fishway,the flow velocity at the inlet of the vertical slot fishway is the highest in June,which is(0.242±0.019)m/s;in May,the flow velocity in the vertical slot pool is the highest,which is(0.493±0.009)m/s;the flow velocity of 1#imitation natural channel in May is the highest,which is(1.378±0.473)m/s.The flow velocity of 1#imitation natural channel in each month is higher than that of the inlet of the vertical slot fishway and the fishway pool.The pass rate of the vertical slot fishway is 22.58%,and the turn-back rate is 19.82% .The pass rate of 1#imitation natural channel is 18.06%,and the turn-back rate is 27.08% .The fish uses fishway more frequently between 20 and 8 o'clock.The most frequent use of fishway is between 2 and 3 o'clock,and between 20 and 21 o'clock.
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