To: tejek who wrote (840481 ) 3/4/2015 6:37:46 PM From: joseffy 1 RecommendationRecommended By FJB
Respond to of 1573221 Fish freezing to death in superchilled water... ...................................................................................................... Nova Scotia aquaculture fish killed by superchilled water Cooke Aquaculture sites in Annapolis Basin, Shelburne Harbour, Jordan Bay reporting mortalities CBC News : Mar 03, 2015 Cooke Aquaculture's fish farm in Shelburne Harbour on Nova Scotia's South Shore is one of the sites where officials believe fish have died due to a so-called superchill. (The Canadian Press) Fish at three aquaculture sites in Nova Scotia have died and a so-called superchill is suspected, the provincial Department of Fisheries and Aquaculture said Tuesday. Cooke Aquaculture's sites in the Annapolis Basin, Shelburne Harbour and Jordan Bay are reporting mortalities, officials said. A fish health veterinarian visited the Annapolis Basin and Shelburne Harbour sites and is expected to visit the Jordan Bay site in the next few days to investigate the cause of death, Fisheries and Aquaculture Minister Keith Colwell said in a statement. "Our provincial fish health veterinarians investigate mortality events to rule out diseases of concern," he said. The department said a preliminary investigation has found a superchill happened, meaning sustained cold temperatures dropped the temperature of the water to the level that fish blood freezes — around –0.7 C. Tides in late February and early March also tend to be high, the department said, contributing to to lowering temperatures in sea cages by flooding more shallow areas than usual. Low air temperatures cool the water and receding tides flush the cages with superchilled water.