Effekter av tarehøsting på fisk og skalldyr Nord-Trøndelag 2012

Abstract

The Institute of Marine Research studied effects of kelp (Laminaria hyperborea) harvesting on nearshore fish and crab abundance in Nord-Trøndelag in August 2012. Recordings were made using fixed underwater camera systems and traditional fish and crab catching gear in kelp harvested areas and in reference kelp beds. Recordings of fish varied between the kelp harvested area and the reference area, but no significant variation in fish recordings before and after kelp harvesting were observed. A significant reduction in recordings of larger groups of fish from 2011 to 2012 was evident, but this reduction was not larger in harvested areas than in reference kelp beds, and is likely not an effect of the kelp harvest activity. Gadoids (70% of the total catches) and labrids (18% of the total catches) were the most frequently caught fishes in Nord-Trøndelag in 2012. Apart from increasing the catchability of Goldsinny wrasse (Ctenolabrus rupestris), no significant effects of kelp harvesting on fish and crab catches were observed in Nord-Trøndelag in 2012.