
About 20 dead or dying eels were found, and there were reports this week of dead trout at the lake, about 40 kilometres north on Napier.
It is the second time this year that a major die-off has been detected.
In January, trout and eels died en masse in an event thought to be linked to low levels of dissolved oxygen in the lake's surface water.
"Fish kills have not been uncommon. However, the occurrence of two large fish kills in two consecutive years is unusual and of particular concern," Hawke's Bay Regional Council said on Thursday.
















