Feeding at the air-water interface how prey position influences suction and ram in largemouth bass


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


54-4  Sat Jan 2  Feeding at the air-water interface: how prey position influences suction and ram in largemouth bass Herbert, AM*; Higham, TE; University of California Riverside; University of California Riverside aherb012@ucr.edu

Altering prey capture behavior with changing prey properties is advantageous for many organisms. For fish that live in variable environments with many types of prey, the ability to catch prey throughout the water column and at/on the surface is likely a necessity to survive and thrive. For fish that rely on suction feeding, the air-water interface should pose a challenge given the discontinuity in fluid density between air and water. Largemouth bass (Micropterus salmoides) are known to alter aspects of feeding strikes in response to prey type, prey motion, light levels, and sensory deprivation. In this study, we used 3D high-speed video to quantify the kinematics (ram speed, strike angle, maximum gape, time to peak gape, suction performance) of largemouth bass feeding on pellets at the surface and in the water column. Additionally, we quantified both horizontal and vertical attacks on pellets at the surface. Time to peak gape varied with prey position and the mouth opened faster in surface strikes. The timing of braking also changed with prey position – for strikes on pellets at the surface, braking began at the start of suction or prey capture, whereas braking began after suction or prey capture for mid-water strikes, as shown in previous studies. Therefore, it appears that largemouth bass adopt more of a suction feeding strategy when capturing prey at the air-water interface.

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