Congratulations to Dr. Sarker and Kapuscinski for another successfully published paper in Elementa, a high quality open access journal. Check out the abstract (below) for a brief intro to:

Towards sustainable and ocean-friendly aquafeeds: Evaluating a fish-free feed for rainbow trout (Oncorhynchus mykiss) using three marine microalgae species

Aquaculture, the fastest growing food sector, is expected to expand to produce an additional 30 million metric tons of fish by 2030, thus filling the gap in supplies of seafood for humans. Salmonids aquaculture exploits the vast majority of fishmeal and fish oil rendered from ocean-dwelling forage fish. Most forage fish diverted to these commodities are human-food grade, and all are primary prey for marine predators. Rising costs, price volatility, and environmental sustainability concerns of using these commodities for aquaculture feed are driving the global search for alternatives, including marine microalgae originating from the base of marine food webs but produced in culture. We report the first evaluation of two marine microalgae, Nannochloropsis sp. and Isochrysis sp., for their potential to fully replace fishmeal and fish oil in diets of rainbow trout (Oncorhynchus mykiss), an important model for all salmonid aquaculture. We conducted a digestibility experiment with dried whole cells of Nannochloropsis sp. and Isochrysis sp., followed by a growth experiment using feeds with different combinations of Nannochloropsis sp., Isochrysis sp., and Schizochytrium sp. We found that digestibilities of crude protein, crude lipid, amino acids, fatty acids, omega 3 polyunsaturated fatty acids (n3 PUFA), docosahexaenoic acid (DHA), n6 (omega 6) PUFA in Isochrysis sp. were significantly higher than those in Nannochloropsis sp. Digestibility results suggest that for rainbow trout diets Isochrysis sp. is a better substitute for fishmeal and fish oil than Nannochloropsis sp. The lower feed intake by fish fed diets combining multiple microalgae, compared to fish fed the reference diet, was a primary cause of the growth retardation. In trout fillets, we detected an equal amount of DHA in fish fed fish-free diet and reference diet. This study suggests that Isochrysis sp. and Schizochytrium sp. are good candidates for DHA supplementation in trout diet formulations.

Kapuscinski-Sarker Lab Team Recieves National Sea Grant Funding

NOAA’s new grant from the National Sea Grant College Program awarded our team (Dr. Kapuscinki, Sarker, and Campbell, and our own Brandi McKuin) 245,000$ to help develop a better modeling tool for aquafeeds. This open access software can one day help users asses not only the environmental impact of a diet but whether or not the nutritional content meets acceptable standards.

Read more in this UC Santa Cruz Article by Jennifer McNulty here: Sustainable aquaculture initiative lands $245,000 federal grant

Good work team!

And the walls go on!

Over the last two weeks contractors have installed the greenhouse walls. Feels great to see the (almost) full structure in its place at the farm.

Construction Progress!

Hi All,

Construction on the new greenhouse at the CASFS site has begun! This greenhouse will house the recirculating aquaculture systems we use to rear fish during growth and digestibility experiments, and (soon) integrated agriculture-aquaculture trials. The research performed in the lab on site will help us improve the sustainability of commercial aquaculture feeds and improve the overall benefits of agroecological aquaculture. Although ground was broken before we arrived, we’ve finally gotten a few pictures of the progress. The plumbing is buried, electrical station supports installed, and the foundation is poured. Plus, VIP parking. Check out the gallery below!