Cause for massive fish kill in German-Polish river unclear

Environmental disaster triggers mass fish die-off in the Oder

Mass fish die-off in German-Polish river blamed on unknown toxic

Germany and Poland search for cause of mass fish die-off in river

Could a mass fish die-off in the Oder River happen again? – DW

Dead fish in River Oder on Polish-German border spur contamination

Germany and Poland search for cause of mass fish die-off in river

Mystery toxin suspected as 100 tons of dead fish removed from Oder

Germany and Poland search for cause of mass fish die-off in river

Dead fish wash up on Texas Gulf Coast due to low oxygen