Electrofishing is a useful survey method for assessing fish populations and species composition. The Sevens above Gooram has the special status of good habitat for endangered native fish species including trout cod, Macquarie perch and blackfish. It is illegal for anglers to fish in these waters downstream from Polly McQuinn’s.

These native fish are very vulnerable to predation by the introduced and aggressively invasive redfin species (European or English perch). Redfin are present in the same waters. Native fish caught during electrofishing are returned to the water unharmed. Redfin are destroyed.