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Cannibalism Takes Major Bite Out of Young Blue Crabs, but the Shallows Offer a Refuge
- On March 16, a SERC study found cannibalism accounted for all juvenile blue-crab predation over 37 years in mid-salinity waters, with no fish predation observed.
- After spending roughly two months as larvae, juvenile blue crabs return to the lower Chesapeake Bay where seagrass and nearshore shallows offer refuge from predatory fish but still face threats from larger adult blue crabs.
- The team tethered juveniles with a one-meter tether and found roughly 74% survival and cannibalism signs on 42%, while small juveniles faced 60% to 80% risk in deeper water.
- Protecting nearshore habitats would stabilize blue-crab numbers and support the fishery, but seawalls, riprap, and invasive blue catfish are shrinking these critical refuges, scientists developing the new stock-assessment model warn.
- Study authors observed that buried juvenile crabs remain vulnerable because adult blue crabs use chemical cues rather than sight, and sonar video observations and tethering results found no fish predation while nearshore shallows provide a crucial refuge, Matt Ogburn said.
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Partially Eaten Remains Reveal Cannibalism Is the Biggest Threat to Young Blue Crabs in Chesapeake Bay
Learn how a 37-year study in Chesapeake Bay revealed that cannibalistic blue crabs are the biggest threat to young crabs, and why shallow waters may help them survive.
·Jupiter, United States
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The blue swimming crab is the culinary highlight of Chesapeake Bay on the American East Coast. Its tasty reputation means that not every blue crab can enjoy its retirement, but there is an even greater danger for young crabs… And that is, remarkably, their own species. Young crabs are being devoured in large numbers […] More science? Read the latest articles on Scientias.nl.
·Middelharnis, Netherlands (Kingdom of the)
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Total News Sources25
Leaning Left3Leaning Right1Center7Last UpdatedBias Distribution64% Center
Bias Distribution
- 64% of the sources are Center
64% Center
L 27%
C 64%
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