Recovering species likely seeding surrounding waters with offspring, new research shows. West Coast rockfish species in deep collapse only 20 years ago have multiplied rapidly in large marine protected areas off Southern California, likely seeding surrounding waters with enough offspring to offer promise of renewed fishing, a new study has found.
(From Science Daily)– The research published in Royal Society Open Science shows that protecting important ocean habitat promotes the long-term recovery of rockfish such as cowcod and bocaccio that have long been a staple of West Coast fishermen. Favorable ocean conditions also played a role, according to the study by scientists from NOAA Fisheries’ Southwest Fisheries Science Center (SWFSC), University of San Diego, and the University of Massachusetts Amherst.
“The larvae of several species of rockfish that were once heavily fished increased in number within protected areas over the past decade,” said Andrew Thompson, a research scientist at the SWFSC in La Jolla, Calif. “The larvae have the potential to drift outside the protected region. That’s good for fisheries because it can build populations beyond the protected waters too.”
The research drew on long-running surveys of California waters by the California Cooperative Oceanic Fisheries Investigations (CalCOFI), a partnership between the California Department of Fish and Wildlife, NOAA Fisheries and the Scripps Institution of Oceanography. The collaboration began in the 1940s to study the factors behind the collapse of the California sardine fishery and continues quarterly surveys to study ocean conditions and fish populations.
“We would have never known this if not for the trove of data we get from those ships out on the water regularly looking at everything from temperature to, in this case, numbers of larval rockfish,” said Kristen Koch, Acting Director of the SWFSC. “We’ve discovered this conservation success story thanks to long-term monitoring that gives us new insight into how the ocean works and changes.”
The study used CalCOFI data to examine larval numbers of 15 rockfish species inside and outside two large protected areas…
Read the full article here: https://www.sciencedaily.com/releases/2017/09/170920154955.htm