Growing Bigger Fish: A Tough Roe To Hoe

  • Newly hatched rainbow trout

Growing Bigger Fish: A Tough Roe To Hoe

Geneticist Ken Overturf collects immature trout, or fingerlings, in the wet lab for weight and other measurements to determine how the fish use different feeds.

Most rainbow trout farmers do not manage their own breeding fish, but instead purchase eggs for production from outside sources. ARS researchers in Aberdeen, ID, and their collaborators at the University of Idaho’s Aquaculture Research Institute have developed an improved line of trout germplasm that the nation’s second largest commercial egg retailer is selling to trout farmers.

Fish bred from the new germplasm have shown an increase in weight gain from 175 grams to 400 grams after 5 months of feeding on a sustainable plant protein diet. In addition, research has shown that these fish are more metabolically efficient and can better process and utilize protein from different sources. The improvement in fish size and health not only improves the economic bottom line for fish farmers now, it will help provide more food for a growing global population.

Explore Other Discoveries

Newly hatched catfish
Fly Frass Forms Fabulous Fish Food

A new fish food made from fly frass is helping fish farmers raise larger, healthier catfish.

Read More
A spoon scooping sugar from a bowl
Sweet Alternative For Fly Control

Scientists are investigating artificial sweeteners as an alternative to insecticides to control flies.

Read More
pineapple weed
Mosquito Repellency Of Pineapple Weed

ARS scientists conducted a study of essential oil from dried pineapple weed for repelling mosquitoes.

Read More
ARS microbiologists Douglas Gladue and Manuel Borca work on African swine fever vaccine in a lab
Advancements Against African SFV

Scientists have made two important advancements against African swine fever virus which causes a lethal disease in swine.

Read More
Illustration of a male cattle tick
Cattle Fever Tick Control Goes High Tech

Researchers are bringing high-tech tools to the fight against cattle fever ticks along the U.S.-Mexico border and in Puerto Rico.

Read More
A sow and eight piglets
Keeping Sows Comfortable

Looking at the temperature preferences of sows with an eye toward keeping them more comfortable before and during pregnancy.

Read More