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• W2186165687 abstract "Burst swimming performance was measured for northern anchovy larvae from 0.23 to 1.33 cm total length at a temperature of 17 C. Fast starts and burst swimming were initiated using a 3 V/cm direct current electric shock. Performance was measured from movie film recorded at 250 framesis. Percent- ages of larvae responding to the stimulus increased from 97r 40 hours after eggs were spawned to a maximum of 95 ~4% after 125 hours. Distances traveled in a given time period increased linearly with length so that maximum speed (Urnax) and mean speed (Dl similarly increased linearly with total length tL) according to Urnax = 20.8 L + 1.95; U = 8.18 1, + 4.89. The maximum distance traveled per burst CS,,,) wasusedasameasureofenduranceandincreasedwithlengthaccording toSrnax = 3.791, + 0.08. These swimming speeds and endurance relationships can explain a large portion of size- dependent selectivity of towed plankton nets. Larval swimming performance has been the focus of several studies (Blaxter 1969; Rosenthal and Hempel 1970; Hunter 1972). These have em- phasized sustained swimming speeds which are considered an important factor affecting the vol- ume of water searched by a larva, and hence food density requirements or the encounter frequency with food items. These low levels of activity appar- ently affect ration and at the same time are major contributors to routine energy expenditures (Vlymen 1974). In contrast, very high activity levels (fast starts and steady burst swimming) are rare. While they are unlikely to constitute a large metabolic load, high speeds are essential to the act of capturing food items (Hunter 1972) and in escaping from predators. This aspect of larval performance has not been evaluated. Therefore, the purpose of this work was to determine the effect of size on burst swimming performance (acceleration and sprints) for northern anchovy, Engraulis mordax, larvae, and to evaluate the importance of such high levels of activity in prey capture and escape from preda- tors, including nets." @default.
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• W2186165687 date "1981-01-01" @default.
• W2186165687 modified "2023-09-27" @default.
• W2186165687 title "BURST SWIMMING PERFORMANCE OF NORTHERN ANCHOVY, ENGRAULZS MORDAX, LARVAE " @default.
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