Coaster Brook Trout Spawning from Isle Royale

  In October of 2017 USFWS hatchery staff from Genoa National Fish Hatchery(OreyEckes) and Iron River National Fish Hatchery (Brandon Keesler) partnered with Ashland Fish and Wildlife Conservation Office staff  (Henry Quinlan and Evan Boone) to collect coaster brook trout eggs from Isle Royale (Tobin Harbor).

 

Fyke nets were set daily to collect adult spawning coaster brook trout from historical spawning locations. As the fish swim along the shore they are guided into the net. Nets are checked daily until the desired number of adult spawning pairs is collected.

 

 

 

 

Biological data is collected from all the coaster brook trout that are captured in the nets. This data helps fisheries managers better manage and assess the population.

 

 

 

 

Length and weight data is collected to understand growth rates in the wild and determine the age of the fish.

 

 

 

 

Each coaster brook trout was also PIT tagged.  These tags help track individual fish movement and growth. These tags give each fish an unique tag number making them easier to identify when recaptured.

 

 

Eggs were collected from 20 females and milt from 40 males to create a brood stock with 40 families. The eggs were transported back to the Genoa National Fish Hatchery for incubation.

 

 

 

 

 

Eggs were collected from 20 females and milt from 40 males to create a brood stock with 40 families. The eggs were transported back to the Genoa National Fish Hatchery for incubation.

 

 

 

 

Currently the eggs are over a month old and now have eye spots. They will remain at the Genoa National Fish Hatchery until they are about 10 inches before they are transferred to the Iron River National Fish Hatchery to be used as a future brood stock.

By Orey Eckes

 


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