Algemeen

Short-term peaks of contaminant concentrations and flows go undetected at many minesites. Recent biological studies have shown that short peaks can contribute significantly to toxicity due to aspects like damage per unit of time, accumulating damage through time, damage at any concentration, temporally aligned or offset synergistic and antagonistic interactions, and slowly reversible or non-reversible uptake and binding of some metals and other elements.

The May 2019 newsletter of the Saitama Ecosystem Conservation Society describes how, before the introduction of neonicotinoids in the 1990s, numberless brilliant red akiakane or autumn darter dragonflies could be seen around rice fields in the fall. Experiments by Japanese dragonfly expert Tetsuyuki Ueda of Ishikawa Prefectural University showed how the pesticides reduced the number of surviving dragonfly nymphs to a small fraction, and that the chemicals persist for years in the soil of rice paddy fields.

Freshwater fish species globally are under grave threat according to the latest edition of the International Union for Conservation of Nature (IUCN)’s Red List. In fact, over half of Japan’s endemic freshwater fishes and more than a third of freshwater fishes in Mexico were threatened with extinction, the list of threatended species released on July 18, 2019, said.

There's new evidence that a widely used family of pesticides called neonicotinoids, already controversial because they can be harmful to pollinators, could be risky for insects and fish that live in water, too. The evidence comes from Lake Shinji, which lies near Japan's coast, next to the Sea of Japan.

Der Schweizerische Fischereiverband kürt die Forelle zum Fisch des Jahres 2020. Er wolle damit darauf aufmerksam machen, dass der «beliebteste Fisch der Schweiz» bedroht sei. Die Gründe dafür und weitere spannende Fakten zur Ur-Schweizerin gibt’s hier.

Ein Ur-Fisch. Die Forelle gehört zu den Lachsfischen, deren erste Vertreter bereits zu Zeiten der Dinosaurier in den europäischen Flüssen unterwegs waren.

In May of 1993, rice farmers living near Lake Shinji, in southwestern Japan, began widely using an insecticide called imidacloprid. Within the same year, populations of arthropods that form the base of the food web, such as crustaceans and zooplankton, began to plummet. By the end of 1994, two commercially important fish that depend on these creatures for food, eel and smelt, crashed as well. And as the use of imidacloprid and other neonicotinoids has grown over the years, the fish have never recovered.

«Schlimmer als befürchtet» , nennt der Schweizerische Fischerei-Verband SFV die Pestizid-Belastung der Schweizer Gewässer. Besonders alarmierend ist, dass die Fische gleich doppelt belastet sind: Durch die Dezimierung der Nahrung und durch den vergifteten Lebensraum.