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:
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.
Enrollment season is upon us, and for the first time at UCSC, ENVS upper division students have the opportunity to study under the world renowned Dr. Pallab Sarker in his class ENVS 135, Sustainable Aquaculture.
All over the world, aquaculture is the fastest growing production sector, due to the combination of strongly increasing demand for seafood products and depleted fish stocks in the world’s oceans. Aquaculture needs to simultaneously pursue environmentally sound, economically viable and socially acceptable development – that is the principle of (three pillars) sustainability – in order to avoid the same mistakes of industrial agriculture.
In this course, students will learn to understand current aquaculture systems, in settings ranging from international (e.g., China, Bangladesh) to local (e.g., abalone farms in Monterey Bay area) and learn about the science and practices needed to steer aquaculture’s development to sustainability. This course will take a broad and a critical look at the practices of present-day aquaculture—and apply a sustainability framework to analyze the environmental, social, economic, and human health effects of sustainable aquaculture systems. This course will provide in-depth and practical experience which includes hands-on experiential learning at the UCSC Aquaculture lab, and visits to local aquaculture farms, contact with private seafood sector, and several guest lectures by resident UCSC experts.
Enroll now for Winter 2020, or pencil it into your schedules for a future winter quarter. Don’t miss out on this opportunity to learn from one of the best in his field!
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!
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.
We have officially joined the Agroecological research team at the Center for Agroecology & Sustainable Food Systems. Check out our very own page here — Ecological Aquaculture at the UCSC farm.
Starting this summer the whole Kapuscinski Sarker lab team will officially be at UCSC and we couldn’t be more excited to join this community!