Fisheries Behavioral Ecology - Abstracts
Davis, M.W. 2001. Behavioral responses of walleye pollock, Theragra chalcogramma, larvae to experimental gradients of sea water flow: implications for vertical distribution. Environmental Biology of Fishes 61:253-260.
Abstract
Walleye pollock larvae under controlled laboratory conditions were exposed to vertical gradients of sea water flow
in low and high light. Whether flow originated from the surface or the bottom, larvae responded by altering depth
distribution, showing attraction to low flows, avoidance of higher flows and when flow was above a threshold level,
loss of ability to orient, swim and feed. These results demonstrate that walleye pollock have the capability for
responding to gradients of flow by adjusting their vertical distribution. Walleye pollock and many other pelagic fish
larvae have weak swimming capabilities and are generally unable to directly control horizontal distributions in the
sea by swimming in higher flow regimens. However, using vertical migration, larvae may select conditions of flow
direction and speed which are favorable for feeding and predator avoidance and which indirectly allow them to
control transport, aggregation and dispersion.
Last updated
26 April, 2007
FBE Webmaster
|
