Effects of larvae ontogeny, turbidity, and turbulence on prey attack rate and swimming activity of Atlantic herring larvae

摘要: Abstract The effect of turbulence, light level, and ontogeny on herring larva's attack rate swimming activity was tested in a previous study. However, during larval seasons (spring autumn), water clarity is frequently impaired by alga blooms, which also most probably will affect larva feeding rate. Therefore, this study to investigate the effects turbidity, larvae. By adding diatomaceous earth (DE) water, three turbidity levels were established: 0, 35, 80 Jackson Turbidity Unit [JTU; coincide with beam attenuation (c) 0.1, 2.5, 4.8 m−1, respectively]. An unfavourable (8×10−6 W/kg) favourable turbulence level (1×10−6 chosen based results from earlier show that intermediate (35 JTU) has positive smaller larvae (20 mm), while high (80 negative all size groups. In general, lower at highest compared low independent level. there one exception, when highest, largest (29 mm) seemed gain overall higher presented than without turbidity. coincides normally found equivalent depth spring autumn blooms area where experimental originate. addition, turbidity's absorbtion how it influences maximum are discussed.