EXPERIMENTAL USE OF FISH PUMPS IN VARIOUS PHASES OF FISHERIES-I:SUCTION EFFIENCY RELATED TO SWIMMING POWER OF MACKEREL AND HORSE MACKEREL
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概要
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In order to secure a basic information on behaviour of fish being sucked into a pump, field experiments were undertaken in Tateyama Bay in August 1961. To begin with, a number of sample fish were put into a transparent vinyle hose, 10cm in inner diameter, and 3.5m in length, and subjected to an outflow stream from a 4-inch fish pump. The species of fish used included the mackerel, horse mackerel, and globefish (Table 1.). The average swimming power for each species was measured by observing the length of time needed for a normal run of the stream in forcing back the fish for 2 meters through the hose. The experiment indicated as in Figs. 1 and 2 that the average swimming power (Vf) defind as above was nearly in such relation with the current velocity (V), or with the body length (L), as Vf=C1ex1 Vf=C2eβL, respectively, where C1, C2, α and β are constants depending on species of fish. According to the observations, the mackerel had swimming power stronger than the horse mackerel. Reaction of those fishes to the suction force was determined by the use of a 4-inch fish pump, which had 800r.p.m. of the impeller driven with a 1-H.P. motor, suction-lift about 2meters, and suction capacity of 19.5 liters per second for sea water. The suction mouth was equipped with L-shaped nozzle, 10cm in diameter, covered with a cylindrical wire cage, 30cm in diameter, 48cm in height, and 0.3cm in mesh size. The cage received either 120 individuals of the hose mackerel, or 23 of them along with 7 mackerels; water was pumped up for 5 minutes at a rate of 250cm per second when running through the hose; then the number of fish pumped up was counted (Table 2 and 3). The suction power was effective within a radius of 5 to 10cm depending on species and size of fish; when the fish came close to the suction mouth, they always swam against the stream, but the mackerel and horse mackerel did not appear to be as sensitive as the globefish tested in avoiding the dangerous stream; suction efficiency was better with the nozzle held upward than those held downward or on a level.
- 社団法人 日本水産学会の論文
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- EXPERIMENTAL USE OF FISH PUMPS IN VARIOUS PHASES OF FISHERIES-I:SUCTION EFFIENCY RELATED TO SWIMMING POWER OF MACKEREL AND HORSE MACKEREL