Tropical Hammerhead Sharks can dive into frigid depths to find food, say scientists in a recent study of shark behaviour documented in The New York Times on 11 May 2023.
The Scalloped Hammerhead Shark (Sphyrna lewini) is an elasmobranch ectotherm fish in the Sphyrnidae family with a cartilaginous skeleton. It is also known as the Bronze Hammerhead, the Kidney-Headed Hammerhead, or the Southern Hammerhead. It likes warm ocean water, such as the tropical waters of Hawaii.
Research scientists have found that the tropical Hammerhead Shark can dive more than 790 metres (2,600 feet) from the warm ocean surface to frigid depths multiple times a night to hunt for fish and squid.
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What is carcinology?
Carcinology is the scientific study of crustaceans.
A crustacean is an arthropod with a hard shell, several pairs of jointed legs, and usually lives in water. Crabs, Lobsters, Crayfish, Water Fleas, Krill, Barnacles, Copepods, Prawns, and Shrimp are crustaceans.
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The Linear Cobalt Crayfish (Cambarus gentryi) is a freshwater decapod (10-legged) crustacean in the Cambaridae family of crayfish.
The Linear Cobalt Crayfish has a cobalt blue shell with orange or yellow markings. It has 10 appendages – two of them are large pincers. Its other legs have a small claw at the end. It has 20 body segments grouped into two main parts: the cephalothorax and the abdomen.
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The Blue Whale (Balaenoptera musculus) is a marine (saltwater) mammal, and the largest animal known on the planet.
The Blue Whale can grow to 30 metres (98 feet) in length. The female is larger than the male.
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A new Zebra Shark has joined the large pool in the Paris Aquarium in the capital of France. The Zebra Shark has been named Rôti, which is French for Roast. It joins other Zebra Sharks but Rôti is easily recognized because it is the smallest of the Zebra Sharks.
Rôti comes from the Skegness Aquarium in England, as part of an exchange for the preservation of species. Skegness is a seaside town in Lincolnshire on the east coast of England. The Skegness Aquarium opened in 2015.
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What is a group of sardines called?
A group of sardines is called a school of sardines, or a family of sardines.
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The Mottled Bichir (Polypterus weeksii) is a freshwater fish in the Polypteridae family of ray-finned fish and reedfish. It is also known as the Fat-Headed Bichir.
The Mottled Bichir is an elongated fish with a series of 7-18 dorsal (back) finlets instead of a single dorsal fin. The finlets (small fins) can be raised and flattened. Its light-grey body has thick scales in patterns of dark-grey bands, and a white underbelly. It breathes through spiracles on the top of its head, four pairs of gills, and ventral lungs – the left lung is shorter than the right lung.
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In general, the female of the species gives birth to babies, but not always. The male seahorse goes through pregnancy, and not the female.
The male seahorse has a pouch on its stomach where he carries his babies.
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The Yellowback Anthias (Pseudanthias evansi) is a marine (saltwater) fish in the Serranidae family of sea basses and groupers. It is also known as the Goldback Anthias, Goldback Basslet, and Purple Wreckfish.
The female Yellowback Anthias is mainly violet with a yellow back and yellow caudal fin. The caudal fin is deeply forked with long thin edges. It has a light purple line through its eyes. The male has yellow dots on its upper body.
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The Decorator Crab, or Collector Crab, is a marine saltwater crustacean in the Majoidea super-family with several different species.
The Decorator Crab is difficult to see in its natural habitat in tropical reefs and lagoons because it covers itself with aquatic plants and materials from its environment.
About 75% of crabs in the Majoidea super-family decorate themselves for camouflage. Some cover themselves completely and some cover themselves a little bit.
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Scientists at the Australian Institute of Marine Sciences (AIMS) have stated that the coral cover in Australia’s Great Barrier Reef is the highest ever recorded, since records began 36 years ago, but the ecosystem remains vulnerable.
The Great Barrier Reef on the eastern coast of Australia is the world’s largest natural reef system of over 2,900 individual reefs and 900 islands over 2,300 kilometres (1,400 miles) long. It was listed as a UNESCO World Heritage Site in 1981 and labelled one of the seven natural wonders of the world in 1997.
AIMS scientists have been monitoring the levels of coral coverage in the reef to determine its health. They publish their findings annually.
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The Largescale Four-Eyes (Anableps anableps) is a freshwater and brackishwater fish in the Anablepidae family of four-eyed fish.
The Largescale Four-Eyes is an elongated fish with prominent eyes. It is greyish to reddish-brown in colour. It has a paddle-shaped tail.
It does not really have four eyes. Each eye has a horizontal band of tissue that splits the skin lengthwise (horizontally) into two lobes. Each lobe has its own pupil with its own vision. Therefore, there are four pupils, not four eyes. This means that, when it lies on the surface of the water, one lobed pupil looks at the sky and the other lobed pupil looks underwater. So, it can see above and below the surface of the water at the same time.
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The Red Reef Hermit Crab (Dardanus arrosor) is a decapod crustacean in the Diogenidae family of crabs. It is also known as the Mediterranean Hermit Crab.
The Red Reef Hermit Crab has a beige-coloured shell, called a carapace. The body of the Hermit Crab is hidden in the shell. The colour of its body varies from bright red to bright orange. Its eyes are at the tips of two eyestalks. The eyestalks are streaked red and white, and the eyes are bluish. It is a decapod, which means that it has ten appendages (two claws and eight legs). Its two red claws have a black or yellow tip. The claws have hair-like spines and warty tubercules. The left claw is larger than the right claw.
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The European Bass (Dicentrarchus labrax) is a marine (saltwater) bony fish in the Moronidae family of temperate basses. It is also known as Sea Bass and Mullet.
The European Bass is silvery-grey, sometimes with dark-blue scales on its back. It has a slightly compressed body, a medium-sized head, and prominent jaws. It has teeth and fleshy lips. It has gills to breathe underwater. There are two dorsal (back) fins – the first one has thorny rays. The fins appear yellowish.
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The Common Spider Crab is a master at camouflage, using algae to cover itself.
The Common Spider Crab (Libinia emarginata) is a marine (saltwater) crustacean in the Epialtidae family of stenohaline crabs. It is also known as the Portly Spider Crab or the Nine-Spined Spider Crab. It is native to the Atlantic coastal waters of North America.
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The Broadnosed Pipefish (Syngnathus typhle) is a small marine (saltwater) fish in the Syngnathidae family of seahorses, pipefish, and seadragons.
The Broadnosed Pipefish looks like a thin, straight seahorse or a small sea snake. It is an elongated, long, tube-like, cyclindrical fish with a greenish colour and a yellowish belly. Its flattened snout (nose) is a long tube ending in a narrow mouth which opens upwards and is toothless. It has a fan-shaped caudal fin. It has small gill openings, called slits, which enable it to breathe underwater.
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What is the most poisonous animal in the sea for humans?
The Pufferfish, the Australian Box Jellyfish, and the Stonefish are extremely poisonous marine animals – so toxic that they can kill a human within minutes. But which one is the most poisonous?
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The Ghost Cardinalfish (Apogon leptacanthus or Zoramia leptacantha) is a marine (saltwater) fish in the Apogonidae family.
The Ghost Cardinalfish has a compressed body with a large head, large mouth, and large round eyes. Its lower jaw protrudes over its upper jaw. It is silver with a light-black bar on the caudal fin. Underneath its eyes is a thin, black line extending backwards. It has two dorsal (back) fins.
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The Firemouth Cichlid (Thorichthys meeki) is a tropical freshwater fish in the Cichlidae family of cichlids.
The Firemouth Cichlid has an oval, flattened body. Its head tapers towards its mouth. It is silvery with fiery red colouring under its chin and on its belly. There is a black, broken line on the side of its body. It has spiny fins with a bluish tint.
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The Bubble Coral (Plerogyra sinuosa) is a marine (saltwater) zooxanthellate coral in the Caryophylliidae family of stony corals, although this is not definitive according to some zoologists – they refer to its classification as Incertae sedis or Problematica (which means ‘uncertain placement’ or ‘problematic’). It is in the Cnidaria phylum. It is also known as Grape Coral, Pearl Coral, and Bladder Coral.
The Bubble Coral ‘bubble’ is grape-sized and roundish. It is cream to yellowish to light beige. Bunched together, like grapes, they form a colony that looks like an inverted cone.
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