A common sight on dinner tables in Canada, America, and Mexico, the blue crab-- also known as the Atlantic blue crab or the Maryland Blue crab (Callinectes sapidus)-- is native to the the Gulf of Mexico and the Atlantic coast of North America. This species is a bottom dweller, and can occupy a range of habitats from freshwater tributaries to the open bays and gulfs of the ocean itself. At times it may be found at high tide, but most individuals remain submerged at depths up to 36 m (120 ft) deep.
As indicated by its name, the claws and front body of male blue crabs are bright blue. Females are carry a blue tinge, but are largely brown or olive, though the tips of their claws are bright red. Otherwise, the two sexes may be distinguished by the shape of their underside, or "apron"; males have an inverted 'T' shape, while females have a wider, rounder shape. Individuals of both sexes may grow up to 23 cm (9 in) in width, and weigh up to 136 g (0.3 lbs).
Spawning for C. sapidus can occur year-round, but for most populations it peaks in October or November. When females are ready, they travel up estuaries and rivers to where populations of males are more concentrated, and then release pheromones in their urine to attract mates. Male crabs then compete for access, and guard their chosen mates fiercely for up to a week. During this time, the female molts, at which point the male fertilizes her. Afterwards, she may retain her mate's sperm for up to a year, during which time she returns to saltier waters. A female can fertilize 2 million eggs at a time, and will carry them in a mass under her abdomen until they hatch, about a week after fertilization. She may do this as many as 4 times throughout a single mating season.
Once hatched, Atlantic blue crab larvae are released into the ocean. Each larvae spends 30-40 days going through seven larval stages known as zoea; these stages are similar to the instars of a larval insect. However, zoea have hard shells and must molt at each stage of development. After the initial zoea stages, juvenile C. sapidus enter the megalops stage, which lasts 6-20 days. During this time juveniles move from the ocean into the estuaries in which they spawned. Finally, they molt into their final form, which resembles an adult-- albeit much smaller. Both males and females continue to molt throughout the year until they reach their full size. In total, both sexes go through about 25 molts each throughout their lives, which spans about 3 years in the wild.
Blue crabs have a wide and varied diet, as they are omnivores. In their larval stages, Maryland blue crabs consume primarily plankton and detritus. Megalops and adults will feed on clams, mussels, and oysters, small fish, kelp, seaweed, carrion, smaller blue crabs, and animal waste. In turn, both juveniles and adults are food for eels, large fish some sharks, stingrays, and humans. In fact, predation upon larval and sub-adult blue crabs is so heavy that, of 8 million eggs released by the mother, only 1 or 2 typically survive to adulthood.
Conservation status: The Maryland blue crab has not been evaluated by the IUCN. However, in recent decades, fisheries have noticed a severe decline in abundance, likely due to over-harvesting and pollution.
If you send me proof that you’ve made a donation to UNRWA or another fund benefiting Palestinians– including esim donations and verified gofundmes– I’ll make art of any animal of your choosing.
#2013 - Portunus armatus - Australian Blue Swimmer Crab
Photo by Patrick Wake
AKA Blue manna, Blueys, and Jennies (for females). Formerly part of Portunus pelagicus, until DNA evidence and close anatomical study split that genus into four species. It might not be blue, and it's missing the most distinctive part of the anatomy, but it's definitely a Blue Swimmer.
This is the fifth leg, flattened into a paddle. They can swim quite well for a crab, which combined with their aggression can lead to alarming encounters with you're swimming or wading in the same ocean.
Blue Swimmers are an important recreational fishery in Australia, and populations are generally healthy, but have collapsed where overfishing is combined with pollution.
They live in estuarine and marine waters from theintertidal down to 50 m depth, moving to deeper water in winter, or out to sea when fresh water enters estuaries. They prefer areas with flat muddy or sandy bottoms with seagrass or algae where they can hunt small fish and other crustaceans, molluscs, and worms, and supplement the diet with algae and seagrass. They reach maturity in one year, and after three years may have an 80cm claw span.
Today was the day i finally started researching for science... i think.
I had to identify each species that my advisor managed to find on a beach.
They were collected in a beach which had rocks, on low tide, so some of the species collected were actually common from reefs.
I went from the crabs first, because I thought they were the easiest ones to identify... boy i was wrong, just the brachyura identification of the coast of brazil had basically 800 pages, but this big one here was actually easier to id, because, for one, because of the slippers on their backs, they are surely what the brazilians call a "siri", so from the family Portunidae, to get the actual genre and species was a little bit tricky, basically, the males from the genre Callinectes have their telson in a T form (the book is very vague about what the hell is a T, but its their telson), you had to see little spikes they have around the eyes to determine the species, its probably a Callinectes danae
its not their penice s btw,,,
these are pistol shrimps, one of them had eggs with them, i'll have to study some Alpheidae (pistol shrimp superfamily) identifications so i can ID these ones.
The other ones were 2 Carcinus maenas and a bunch of Clibanarius crabs, that i won't show cuz they're pretty gory, because they were stuck in their shells and i had nothing to break the shells, so i had to yank them out (worst part of doing ids with crustaceans).
also was a pain in the ass to look cleary throught the lenses of the macroscope, so i made a sketch based on what happened
Крабы-плавунцы Portunidae — семейство морских крабов-плавунцов, характеризующееся трансформацией пятой пары ног в широкие лопасти, которые используются для плавания. Эта способность в сочетании с сильными, острыми клешнями позволяет многим видам быть быстрыми и агрессивными хищниками, но некоторые виды довольствуются поеданием детрита. Это очень маленькие крабы, обычно диаметр их панциря составляет всего 3-5 см, они переносят значительные колебания солености или химического состава воды. Крабы-плавунцы встречаются в основном в Индо-Тихоокеанском регионе, а песчаный краб-плавунец также обитает в Черном море
Rajungan adalah nama sekelompok kepiting dari beberapa genus anggota famili Portunidae. Kata ini diambil dari bahasa Jawa rajungan. Jenis-jenis kepiting ini dapat berenang dan sepenuhnya hidup di laut.
Yuk, makan ikan agar tubuh kuat dan sehat!
THE SUNFISH menyediakan hasil laut dengan KUALITAS TERBAIK HARGA TERBAIK dan terjaga KESEGARAN NYA!!
Kamu bisa dapatkan Kepiting Rajungan yang pasti terjamin kesegarannya dengan harga terjangkau.
yang pastinya beli di THE SUNFISH GROSIR IKAN LAUT dongg!!
GROSIR IKAN LAUT TEMANGGUNG
Jl. Jampirejo Timur Rt. 04 Rw. 06 Kelurahan Jampirejo Kec. Temanggung Kab. Temanggung
(Dekat TK Masyitoh Jampirejo, 50 meter dari Masjid Al Huda Jampirejo)
KLIK https//wa.me/628994648716,
Menyediakan:
Sedia berbagai Ikan Segar, Hasil Laut dan Air Tawar :
Ikan : Kakap Merah , Bawal Putih , Teri Nasi , Salmon, Dori ,Tuna,
Udang : Lobster, Udang Laut, Udang Vanamae
Kepiting : Kepiting Bakau, Rajungan
Kerang : Kerang bamboo, kerang hijau, kerang dara bulu, kerang dara jahe
Olahan : Bakso Ikan, Bakso Udang, Bakso Kepiting, Fillet Ikan, Nugget Ikan
Gilingan : Gilingan Tengiri, Gilingan Tunul/Baracuda, Gilingan Mahi-mahi
Melayani Grosir dan Retail/eceran
PELUANG USAHA KEMITRAAN Seafood booth, frozenfood, supplier dan distributor
Fast Respon PELUANG USAHA 08994648716
IG https://www.instagram.com/thesunfish_grosirikanlaut/
FB https://www.facebook.com/profile.php?id=100094495374590
TIK TOK https://www.tiktok.com/@thesunfishgrosirikanlaut
Kepiting bakau adalah sejenis kepiting yang hidup di ekosistem hutan bakau dan estuaria, anggota suku Portunidae. Kepiting yang mempunyai nilai ekonomis penting ini didapati di pantai-pantai pesisir Afrika, Asia dan Australia.
Yuk, makan seafood/ikan agar tubuh kuat dan sehat!
@thesunfishgrosirikanlaut menyediakan hasil laut dengan KUALITAS TERBAIK HARGA TERBAIK dan terjaga KESEGARAN NYA!!
GROSIR IKAN LAUT TEMANGGUNG.
Jl. Jampirejo Timur Rt. 04 Rw 06 Kelurahan Jampirejo Kec. Temanggung Kab. Temanggung
(Dekat TK Masyitoh Jampirejo, 50 meter dari Masjid Al Huda Jampirejo)
KLIK https//wa.me/628994648716,
Menyediakan:
Sedia berbagai Ikan Segar, Hasil Laut dan Air Tawar :
Ikan : Kakap Merah , Bawal Putih , Teri Nasi , Salmon, Dori ,Tuna,
Udang : Lobster, Udang Laut, Udang Vanamae
Kepiting : Kepiting Bakau, Rajungan
Kerang : Kerang bamboo, kerang hijau, kerang dara bulu, kerang dara jahe
Olahan : Bakso Ikan, Bakso Udang, Bakso Kepiting, Fillet Ikan, Nugget Ikan
Gilingan : Gilingan Tengiri, Gilingan Tunul/Baracuda, Gilingan Mahi-mahi
Melayani Grosir dan Retail/eceran
PELUANG USAHA KEMITRAAN Seafood booth, frozenfood, supplier dan distributor
Fast Respon PELUANG USAHA 08994648716
IG https://www.instagram.com/thesunfish_grosirikanlaut/
FB https://www.facebook.com/profile.php?id=100094495374590
TIK TOK https://www.tiktok.com/@thesunfishgrosirikanlaut
ISOPODS WHAT FUNKY LITTLE (AND SOMETIMES BIG) GUYS they go skitter skitter and i am delighted fo see them always
marine life is VERY SPECIAL i love it very much very much
I LOVE LARGE ISOPODS!!!!!! So special dude, so special… God i love em. Here’s my favourite gif of all time. How is this cr. Truly a remarkable creature never seen before :D [Fact, it’s a portunidae, which is a family of swimming crabs :D Look at em go!]
Todo siri é, na verdade, também um caranguejo. A explicação é simples: siri não passa de um nome popular dado aos membros da Portunidae, uma das várias famílias de caranguejos.