Sea Technology

JUN 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 59 of 72 June 2017 / st 59 survey's 28-year history. Spawning-age female crabs are the cornerstone to maintaining a vibrant crab stock and depend on conservative and coopera- tive fishery management efforts among the Chesapeake Bay jurisdictions. The total population of blue crabs in the Chesapeake Bay fell a bit, by 18 percent, due to a decline in the num- ber of juvenile crabs, but remains at the 11th-highest level ever recorded. The adult male stock fell by 16 per- cent. However, the juvenile abundance plummeted by 54 percent, which is the fourth-lowest level on record. The reproductive variability of blue crabs highlights the need for fishery managers to enhance resilience of the stock through adaptive management to compensate for unusual or extreme en- vironmental conditions and the result- ing impacts on reproductive success. Lessons from Real-Sea Testing Of Wave Energy Converters Wave Energy Scotland (WES) has released the findings from their project with the European Marine Energy Cen- tre (EMEC), which seeks to capture the wealth of knowledge and experience amassed in the Orkney supply chain from testing wave energy devices in real-sea conditions. Results from the project will help wave energy converter (WEC) develop- ers check their readiness for deploying in real sea conditions by taking open- water testing into consideration at an early stage in their design process. The importance of budgeting for regulatory issues, the need for appro- priate lifting points on a device, and the ability to reduce forecasting uncer- tainties through a process of refining and improving marine operations are some examples of the lessons learned. Canada Lists Nine More At-Risk Aquatic Species Canada's Ministry of Fisheries and Oceans announced that nine more aquatic species will receive protection under the Species at Risk Act (SARA): five freshwater fishes, two marine mammals, one sea turtle and one mol- lusk. In addition, the St. Lawrence Estu- ary population of Beluga whale will be reclassified from threatened to endan- gered. SARA governs actions to prevent the extinction of wildlife species and to secure the necessary actions for the recovery of species at risk. New Species of Remipede Discovered in Cozumel An international team of scientists from Texas A&M University at Galves- ton, Denmark, Norway and Mexico have discovered a new species of remipede, rare crustaceans exclusively inhabiting saltwater caves. While exploring a 6-mi.-long under- water cave in Cozumel, Mexico, Texas A&M Galveston marine biologists Dr. Tom Iliffe and Dr. Pete van Hengstum noticed shallow pools of saltwater on the cave's floor. Although this cave functions as an underground river car- rying freshwater to the Caribbean Sea, in a few places it is deep enough to in- tersect underlying saltwater, where the scientists collected several inch-long animals that have been identified as a new remipede species. Remipedes are slender, multiseg- mented crustaceans lacking eyes and body pigmentation. They continuously swim inverted and resemble a swim- ming centipede. With their venom-in- jecting fangs, they have been observed to seize small shrimp as prey. ST

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