Simulated migration of European eel (Anguilla anguilla, Linnaeus 1758)

摘要: The European eel ( Anguilla anguilla L.) is a catadromic fish species with its spawning grounds thousands of kilometers away in the ocean, possibly Sargasso Sea . objective this study was to elucidate oceanic phase migration for laboratory. This thesis focuses on several aspects life cycle eel: A) Preparation migration, B) Simulated C) Effect environmental factors (viruses and PCB's) D) swimming maturation. In order investigate we simulated spawners laboratory by building 22 large swim tunnels 127 liter specially developed long term migration. Therefore title is: 'Simulated eel' What matters how much energy required crossing Atlantic Ocean. An uses only 58 g fat/kg while salmon 300 fat/kg. cost transportation (COT) are 4-6 times lower eels than salmonids. second aims investigations were that may have impact capacity like viruses pollutants (PCB's). third test whether endurance induces sexual maturation development gonads. We can conclude very efficient swimmers healthy well fed able reach leaving enough reserves reproduction. Endurance ability migrate negatively influenced infections EVEX. Also PCB's which released from depleted lipid stores after interfere use metabolism. So, although found habitat fitness such as toxicants (PCBs) could be contributing factor declining populations two positive results future studies importance reproduction under artificial conditions. a) First, strong evidence triggers silvering early maturation, b) Second, observed first time hormone treated group collective simultaneous.