Aquaculture 2025

March 6 - 10, 2025

New Orleans, Louisiana USA

Add To Calendar 09/03/2025 09:00:0009/03/2025 09:20:00America/ChicagoAquaculture 2025DETERMINING SITE SUITABILITY AND PROCESSING POTENTIAL AT ALASKA'S SALMON HATCHERY RELEASE SITES FOR THE INTEGRATION OF MARICULTURE SPECIESGalerie 1The World Aquaculture Societyjohnc@was.orgfalseDD/MM/YYYYanrl65yqlzh3g1q0dme13067

DETERMINING SITE SUITABILITY AND PROCESSING POTENTIAL AT ALASKA'S SALMON HATCHERY RELEASE SITES FOR THE INTEGRATION OF MARICULTURE SPECIES

Angela J Bowers*

Tahvo Wilson

 

University of Alaska Southeast

1332 Seward Avenue

Sitka, AK  99835

 



Each year nearly 1.7 billion salmon are released into the ocean from 29 different hatcheries around the state of Alaska. Most of these fish are reared in ocean net pens for 3 or 4 months and are fed intensively, creating increased nitrogen and phosphorus outputs as well as adding to the nutrient load in the benthic environment near the rearing fish.  These excess nutrients can be a detriment to the environment and to the Aquaculture organizations if they become out of compliance with their Alaska Pollutant Discharge Elimination System (APDES) permit. This detriment can alternatively be considered an opportunity.  Currently in the State of Alaska there is substantial money and effort being put into the development of the mariculture industry and these hatchery release sites have the space and nutrients to help move the needle on mariculture production while benefiting their organizations, the environment and potentially the rearing fish.  In this project we supplied 6 Private nonprofit hatchery organizations with the equipment necessary to help determine site suitability for mariculture integration at 18 different salmon release sites all around Alaska. Hatchery personnel installed loggers and launched Acoustic Doppler Current Profilers (ADCPs) to measure current (speed and direction), oxygen levels, salinity, and temperature. In addition, they went out bi-weekly to collect water samples to measure nutrient levels and light attenuation. Most of these sampled sites show promising site suitability with the possible exceptions of two sites that showed very low salinities at 3 meters in late spring. This information can be used to inform Aquaculture organizations and interested farmers on placement of future farms and provide insight into how to best mitigate excess nutrients in the environment.