Known unknowns

摘要

MADS Lenes of Marine Harvest Norway said the question asked most often at farm sites is 'how do you feed the cleaner fish?' 'The answer is not too much and not too little but how much is that?' The main aim is to keep the fish healthy and fit enough to eat lice.Lenes, who is the cleaner fish coordinator in Norway's northernmost region, said they use ballan wrasse, goldsinny, corkwing and lumpfish and each of the company's four regions have different approaches. For example, more wrasse is used in the south dueto the warmer sea temperatures.