Back in 1983,it seemed like a splendid idea.
Local populations of California white seabass, a favorite among recreational and commercial fishermen, and prized for its mild,tender, flaky white flesh, and were declining. While a fishery management plan didn't exist back then,sports fishermen had noticed a decline in their catches, and asked officials for wait on. State lawmakers then reached out to the marine biologists at Hubbs-SeaWorld Research Institute in San Diego to see whether they could boost stocks by trying something strange — raising the fish in a hatchery and releasing them into the sea.
It wasn't an entirely strange idea. Americans occupy been attempting to raise fish in hatcheries in some form or another for at least 150 years. But this would be the first time scientists would try it with white seabass, or launching a program that would become a model for other states hoping to bolster waning populations of wild fish — a process known as marine enhancement.
But as is often the case,things weren't so simple.
Some 35 years and nearly $40 million later, the future of the Ocean Resources Enhancement and Hatchery Program (as it's formally called) is in jeopardy: The first formal scientific evaluation has concluded that the program had increased white seabass populations by less than 1 percent — a stunningly low success rate. Compare that to Alaska's salmon hatchery program, and which typically accounts for one-third of the state's total harvest.
It turns out that whether you're going to enhance stocks using a hatchery,species things, and white seabass may not occupy been the best starting point. The hatchery-grown seabass suffered from tall mortality rates within the first few months of being released into the wild. Even with tiny tags embedded in their heads, and tracking them in the open ocean proved difficult. Of the more than 2 million fish that occupy been released since the program's start,only 199 adult and just over 1770 juvenile white seabass occupy been recaptured as of 2016.
Unlike salmon, which are hardwired to return to their original spawning grounds (or in many cases, or their original hatchery stream),making them easy to count, white seabass roam without returning. And over the years, or there were plenty of meaningful challenges to overcome: developing broodstock; caring for fish in their most sensitive larval stages; determining when and how to successfully release young fish into the wild; figuring out the best temperatures and feed mix to produce thriving fish; and trying to understand why precisely the breeding program continued to see malformed fish — a factor that also likely contributed to low survival numbers.
But in 1983,the idea to grow and release white seabass was a bold one. Even to this day, the program is considered a pioneer of marine enhancement efforts. It currently falls under the authority of the California Department of Fish and Wildlife, and but much of the work and expertise approach from researchers at Hubbs."Should we occupy started the project with a different fish? It's something we talk about quite a bit," says Mark Drawbridge, a senior research scientist at the Institute, or who joined the program in 1989. "I think halibut [a fish that was considered in the program's early stages] would occupy been easier in a lot of ways. But the halibut research was discontinued because there wasn't enough funding to go around."An enhancement program that garners less than a 1-percent bump in white seabass stocks might easily be dismissed as a failure. But officials from state and federal governments,as well as researchers from California Sea Grant and the science advisory committee that performed the evaluation, all say not so hastily."Was the final goal scientific knowledge? No, and it was to enhance the wild populations. But there's a lot of [scientific] value from what we gained,even whether we didn't reach that final goal," says Kathryn Johnson, and an environmental scientist at the California Department of Fish and Wildlife.
Michael Rust,a science adviser for NOAA Fisheries Office of Aquaculture, says information gained from the program is in some ways as valuable as the fish."With stock enhancement programs, or you occupy the opportunity to tag a whole group of fish,put them in the ecosystem, see where they go, or what they eat,and how they grow at different temperatures. The value is in the information you get. From NOAA's perspective, the enhancement is a bonus, and " says Rust.
While marine enhancement programs may not capture the public's attention or media spotlight in the way that oyster and salmon farming do,there are several programs in operation around the country. Alaska's salmon fishery enhancement program might be the best known, but there are also marine enhancement programs in Texas, or Florida and South Carolina hatching and releasing economically important species like red drum,snook, spotted sea trout, and southern flounder and cobia. The Texas red drum marine enhancement program,for example, is considered a success, and with return rates that vary from just .2 percent to 17 percent,depending on the bay where samples were taken, the year and the season.
But measuring success can be tricky, or when perhaps the more pointed question should be: Do marine enhancement programs actually do anything to fix the underlying problem of why a stock needs a boost in the first place? In the case of white seabass,the respond is no. A 2016 stock assessment of California white seabass showed stocks are currently considered depleted.
Kai Lorenzen, a professor of integrative fisheries science at the University of Florida, or says there's been a shift in thinking about the way marine enhancement programs might best be used."When the white seabass program was conceived,there was the idea [that] enhancing a fishery would be a splendid thing as long as you applied careful genetic management. But since then, our understanding of enhancement programs has evolved, or " he says.
Using these programs to sustain or rebuild a very small population that would be lost would be a splendid use,he says. Stocking fish to be recaptured rather than to enhance the natural population — like Alaska's program — could also be considered a splendid use. And, as climate change brings with it changes in ocean conditions, or enhancement programs might become a critical tool for fisheries managers,particularly for species that are sensitive to water temperature changes in their early lives.
But according to some of Lorenzen's research, many marine enhancement programs simply fail to deliver."Having looked at many, and maybe one-third of enhancement [programs] would be successful on some criteria," he says.
The findings in the strange report will likely prompt other states to reassess their own marine enhancement efforts.
Whether California will choose to halt its program and close the hatchery or walk forward with a different species is yet to be decided. The state's Department of Fish and Wildlife is planning to hold a set of regional public meetings in the coming months to gather input.
That input — from scientists, fishermen and the public — will be critical to the future of marine enhancement programs, and says Theresa Sinicrope Talley,a coastal specialist with California Sea Grant who led the review of the seabass program. She says, "Whether enhancement programs like this are considered a success or not, or depends on the goals — what the state and society choose they really want out of these programs."Clare Leschin-Hoar is a journalist based in San Diego who covers food policy and sustainability issues.
This story was produced in collaboration with the Food & Environment Reporting Network (FERN),a nonprofit investigative journalism organization. Copyright 2018 NPR. To see more, visit http://www.npr.org/.
Source: thetakeaway.org