Three prevalent species of crabs regularly encountered on coastal shores
Explore the vibrant and fascinating world of crabs that call our beaches home. From the brightly coloured Sally Lightfoot crabs to the distinctive blue crabs, here's a closer look at the three major varieties you're likely to encounter.
- Sally Lightfoot CrabKnown for their striking colours ranging from bright red to hints of orange, yellow, and blue, Sally Lightfoot crabs are typically small to medium in size. These agile crustaceans can often be found near rocky areas on beaches, feeding mainly on dead algae. Although not edible, they play a crucial role in balancing the ecosystem. Be mindful when visiting their habitat, as guides often advise visitors, friends warn friends, and parents yell at children to stay away from these crabs due to their striking colours.
- Blue Crab (Callinectes sapidus)Native to Atlantic waters, blue crabs are easily identified by their distinctive blue hue due to pigments in their shell, which turns bright orange-red when cooked. Males have blue claws, while females have red tips on claws. These crabs are known for their culinary importance and have flattened back legs adapted for swimming. Be cautious when handling these crabs, as they pinch when picked up.
- Green CrabAn invasive species common on many beaches, especially on the bay side, green crabs do not have flattened legs and thus are not swimmers. Their population disrupts native crab species and fisheries and they should not be picked up, especially not with bare hands, as they pinch.
When observing crabs, it's essential to maintain a safe distance and avoid disturbing their habitat. If you spot a quiet crab, take photographs from a distance. When a wave sweeps by, a bunch of small crabs can be seen dominating the area near the holes. Be careful where you step to avoid crushing or getting poked by a crab when you see a crab burrow.
While other crabs like the giant mud crab or Jonah crab are notable, they tend to inhabit estuaries, mangroves, or deeper waters rather than typical sandy beach zones. Ghost crabs, found in tropical and sub-tropical environments, are another fascinating species often seen on beaches, with a full-grown ghost crab appearing pale yellow or sandy yellow in colour, unlike the younger ones which may appear red.
Mangrove crabs survive on organic matter like plants and debris and are found near mangrove trees, mudflats, or estuaries. Remember, these crabs, like the Sally Lightfoot crabs, have different appearances beyond just red or orange. So, next time you visit the beach, keep your eyes peeled for these fascinating creatures and enjoy the beauty of nature.
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