Apparatus for assisting the upstream movement of anguillidae

摘要

Apparatus for encouraging the upstream movement of anguillidae or eels by means of an inclined raceway or ladder. The apparatus comprises an element 18 which forms part of the raceway floor. The element comprises a first plurality of individual upstanding projections (25 figure 2) formed in an array. The projections are spaced from one another, at least in one direction, to allow mature eels to contact facing surfaces to assist in forward movement. The apparatus also comprises an array of intermediate projections (27, 28 & 29 figure 2) between at least some of the first projections. The intermediate projections are smaller than the first projections and positioned such as to form, with the first projections, channels the dimensions of which are smaller than the spacing of the first projections to allow juvenile eels to contact opposite surfaces to assist forward movement.