Dams are believed to be one of the biggest threats to freshwater organisms worldwide: They disrupt normal patterns of water and sediment flow, impede migration, and alter the character of spawning and feeding grounds. A shortage of data has until now prevented a thorough global assessment of the threat dams pose to fish species, but a study described in the June issue of BioScience attempts just that.
Tag Archives: fish
Most fish don’t care about windmills the rest likes them
The first Danish study into how one of the worlds largest wind farms affects marine life is now completed. It shows that the wind turbines and the fish live quite happily together. Indeed some species of fish have actually increased in number.
Mediterranean biodiversity versus a globalising planet: from Suez Canal to your tuna pizza
“In reserves off Spain and Italy, we found the largest fish biomass in the Mediterranean. Unfortunately, around Turkey and Greece, the waters were bare” – Enric Sala, National Geographic Society.
Under climate shift marine species face similar migratory distances as land species – and not always a refuge
Shark decline confirmed by demographic model
75% of cut-the-fin-dump-the-dying-shark fishery is illegal. Many sharks also die as by-catch of conventional fishing. These sharks never reach the shore either – and their deaths are also not documented.
Today’s paradox: hunt for oxygen-rich seas may be bad news for hypoxic plankton
Certain types of plankton have adapted themselves to living in water with low oxygen content, so they can hide away from fish when digesting [through anaerobic glycolysis] and meanwhile suppressing their metabolism. Only at night, when in search for food, … Continue reading