THE INFLUENCE OF TEMPERATURE ON THE SURVIVAL OF SEVERAL SPECIES OF FISH IN LOW TENSIONS OF DISSOLVED OXYGEN

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Abstract
The resistance to low tensions of dissolved oxygen over periods ranging from less than a day to a week was determined for rainbow trout (Salmo gairdnerii Richardson), perch (Perca fluviatilis L.), roach (Rutilus rutilus (L.)), and mirror carp, a domestic form of the common carp (Cyprinus carpio L.) at 10°, 16° and 20°C., tench (Tinea tinea (L.)) at 10° and 16°C., dace (Leuciscus leuciscus (L.)) at 16° and 20°C., chub (Squalius cephalus (L.)) at 20°C., and bleak (Alburnus alburnus (L.)) at 16°C.At each temperature period of survival decreased with fall in oxygen tension.Rise in temperature between 10° and 20°C. reduced resistance to lack of oxygen of all species except rainbow trout, in which there was no significant difference between resistance at 16° and 20°C. Rise in temperature between 10° and 16°C. did, however, lower resistance considerably.Tench were the most resistant to lack of oxygen and, in general, trout were the most susceptible. At 20°C. mirror carp required a higher tension of oxygen to enable them to survive for a week than did rainbow trout, but for shorter periods could withstand much lower tensions than rainbow trout; at 10° and 16°C. their resistance was intermediate between that of tench and rainbow trout.