Otago Fish & Game staff successfully relocated more than 500 trout from a stranded pool in the Lindis River in Central Otago this week after being alerted by a concerned member of the public.
The rescued fish included brown trout weighing up to 2.2kg and rainbow trout up to 1.8kg.
Otago Fish & Game operations manager Jamie Ward said the fish had been trapped in a shaded pool that initially had water flowing into it.
"However, as the week progressed, conditions in the river worsened, and the fish became increasingly stressed," Mr Ward said.
"A decision was made to relocate them downstream to Lake Dunstan to ensure their survival."
Electric fishing equipment was used to carry out the relocation in the most effective and least harmful manner possible for the fish.
The fish were transported using oxygenated tanks to give them the best chance of survival.
Over the past month, Otago has experienced dry conditions due to a weak La Niña influence, making it increasingly likely that fish may become stranded in isolated pools.
"While Otago Fish & Game strives to respond to issues of sportsfish welfare, it is not feasible to save every fish in distress," Mr Ward said.
"These are wild animals that we manage, and sometimes the environment, whether natural or altered, can inflict some pretty harsh outcomes."
Interventions must be carefully prioritised based on accessibility, available time and cost viability for Fish & Game licenceholders, he said.
On Thursday, Fish & Game staff also responded to another public report of fish stranded in a pool near Lake Hawea.
Staff successfully relocated more than 100 fish back into the lake, including brown and rainbow trout up to 1.8kg, as well as several native fish species, such as bullies.
"It is always difficult for the public to see fish in these situations and our team face challenging decisions about rescues and relocations," Mr Ward said.
"We greatly appreciate the care and engagement of the public in reporting these incidents, as timely intervention is crucial good outcomes for stranded fish."
— APL
