Species-specific patterns of aggregation of wild fish around fish farms
T Dempster, P Sanchez-Jerez, I Uglem, P-A Bjorn
ESTUARINE COASTAL AND SHELF SCIENCE | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD | Published : 2010
Fish-farming structures are widespread in coastal waters and are highly attractive to wild fish. Several studies have estimated that tons to tens of tons of wild fish aggregate around fish farms. These estimates assumed that the majority of wild fish are concentrated immediately beneath farms, although this assumption has never been explicitly tested. We tested the hypothesis that abundances of wild fish would be greatest immediately beneath farms and progressively diminish with distance at 4 full-scale coastal salmon (Salmo salar) farms in Norway. At each farm, fish were counted with a video-camera system at 5 different distances from the cages (farm = 0 m, 25, 50, 100 and 200 m) throughout..View full abstract
Awarded by Norwegian Research Council's
We thank the salmon farming companies Leroy Midnor and Volden Group/Grieg Seafood ASA for access to farm locations. In addition, we thank Tom Andersen, Rune Nilsen, Hiromichi Mitamura and Mark Gibbs for assistance during the fieldwork. Funding was provided by the Norwegian Research Council's 'Havet og kysten' program to the CoastACE project (no: 173384).