January 11, 2019

A new frontier for deep-sea fish farming

Aquaculture offers a promising avenue for economic development and sustainable local seafood production in the Caribbean, say researchers

By Fabian Dawson
SeaWestNews

The Caribbean has a large potential for deep sea fish farms
which could produce over 34 million metric tons of seafood per year,
researchers from the University of California in Santa Barbara have determined.

This potential yield is more than twice the region’s current
seafood production, according to the results of the study which appeared in the
journal Nature Sustainability.

“The Caribbean has a large potential for off-shore
mariculture,” said Lennon Thomas, the study’s lead author, who serves as a
project researcher at the Barbara’s Bren School of Environmental Science &
Management and the Marine Science Institute (MSI) at the University of
California.

“And meeting this potential can be accomplished by
developing mariculture in a relatively small amount of ocean space,” he
said, according to a report in phys.org.

The Food and Agriculture Organization of the United Nations
(FAO) in its biannual report on the state of the world’s fisheries has said
fish farming is the fastest growing agricultural sector for the past 40 years
and is largely responsible for making more fish available.

The FAO has projected that aquaculture and mariculture will
account for two-thirds of the global food fish consumption by 2030.

The University of California team used cobia as their model
species to estimate the Caribbean’s potential for deep sea fish farming. Cobia
is a premium fish with high market value that is well suited to farming in
warmer waters.

The team focused specifically on ocean-based operations done
far from shore, which offers a promising alternative to land-based and coastal
aquaculture.

The researchers’ model predicts the region could produce 40
million metric tons of seafood in less than 1.5 percent of its countries’
exclusive economic zones. Under current market conditions, the Caribbean could
match its current seafood production by farming in just 179 square kilometers,
or a mere 0.006 percent, of its marine space.

The results in all scenarios of the Caribbean study are
promising, reported physorg.com

“Even accounting for the economics of an expensive operation
like cobia farming, there are large areas of the Caribbean that could be
profitable for off-shore aquaculture,” said Tyler Clavelle, a researcher
at MSI and one of the paper’s coauthors.

Trinidad and Tobago and the Bahamas have the largest
potential, with roughly 8,500 and 4,100 square kilometers, respectively, of
area profitable for deep sea fish farming.

“Offshore mariculture overcomes many of the
shortcomings and potential negative impacts that people often associate with
coastal or inland aquaculture,” said Thomas. Deeper water and stronger
offshore currents can prevent negative water quality impacts from aquaculture,
while also avoiding sensitive nearshore habitats like coral reefs and seagrass
meadows.

“Mariculture is very space efficient. And we have vast
expanses of offshore ocean areas,” said co-author Sarah Lester, an
assistant professor at Florida State University who completed her Ph.D. at UC
Santa Barbara.

“So we can be
really selective about where we locate fish farms, choosing locations where
profitability is high and economic impacts are low.”

“In the Caribbean, like we see globally, seafood demand
is increasing while many wild fisheries have been overfished,” said
Lester.

“Currently many Caribbean countries import large
amounts of seafood—aquaculture offers a promising avenue for economic
development and tasty, sustainable local seafood production.”

More information on the study can be found at here.

Photo credit: Lennon Thomas

Canada
commits to be a leader in the Blue Economy

When
we say “blue economy” we are not only talking about fish.