Sharksonline's Blog

Archive for April 2010

Above the Crested bullhead shark

1. The crested bullhead shark is restricted to the warm temperate waters along the eastern coast of Australia.

2. Crested bullhead sharks are found to a depth of 93 m (305 ft) being more common in deeper waters. They prefer rocky reefs, mats of seaweed and seagrass beds.

3. Crested bullhead shark grows up to 1.2 m (4 ft) long and sometimes grow up to 1.5 m (5 ft).

4. The only way you can the different from the Port Jackson and the Crested bullhead shark is that the eyes are higher on the head and the fins are higher on it’s back then the Port Jackson sharks.

5. The crested bullhead shark is a slow-moving and has been seen wedging its head between rocks in search of food.

6. They eat sea urchins and small fishes. The crested bullhead shark is also a major predator of the eggs of the Port Jackson shark.

7. Crested bullhead shark females  are oviparous and produce 10–16 eggs per year during late winter in July and August.

8. When the pups are born they are 17–22 cm (6.7–8.7 in) long.

All of this info is from

Above the Xenacanthida

1. Some Xenacanthida grow up to a length of 4 m long.

2. This group of shark lived in freshwater environments.

3. Some Xenacanthida had large serrated spines extending backwards from the neck. And had a pair of hook-like cusps.

4. The Xenacanthida Came in the Lower Carboniferous period and died out at the end of the Permian in the Permian Mass extinction. But only a few forms survived into the Triassic period.

5. The family includes the families Xenacanthidae, Diplodoselachidae and Orthacanthidae and the most notable members of the group are the genera Xenacanthus and Orthacanthus.

All of this info is from

1. The zebra bullhead shark are found at the depth of between 50 and 200 m deep.

2. The zebra bullhead shark females are oviparous like most other sharks.

3. The zebra bullhead shark grows up to a length of 1.25 m long.

4. The zebra bullhead shark if found in the subtropical western Pacific Ocean.

All of this info is from

Above the Megamouth shark

1. The megamouth has brownish-black color on top and is white underneath. And can grow to 5.5 meters (18 ft) long. Mature male grow up to (13 ft) long and and mature female grow up to 5 meters (16 ft) long. And weight up to 1,215 kilograms (2,680 lb). And have small teeth. And have a broad, rounded snout. And an asymmetrical tail with a long upper lobe similar to the thresher shark.

2. The megamouth is a ovoviviparous meaning that the young sharks develop in eggs that remain within the mother’s body until they hatch.

3. As of 2009 only 47 megamouth specimens have been caught or sighted. They have been found in the Pacific, Atlantic and Indian oceans. At least ten specimens have been found in the vicinity of each of Japan and Taiwan, more than any other single area. Specimens have also been pulled from the waters near Hawaii, California, the Philippines, Indonesia, Australia, Brazil, Senegal, South Africa.

4. The megamouth shark is an extremely rare species of deep water shark.

5. Since being discovered in 1976 only a few megamouth sharks have been seen with 47 specimens known to have been caught or sighted as of 2009 and three recordings on film.

6. Like the basking shark and whale shark it is a filter feeder and swims with its enormous mouth wide open and filtering water for plankton and jellyfish.

All of this info is from

Above the Angel shark

1. The body of the angel shark is very different from most sharks. They have a flattened body with their five gills slits underneath and their eyes are on top. And their fins are large and held horizontally. They have no
anal fin. The lower lobe of the caudal fin is longer than the upper lobe.

2. Most sharks like this grow up to 1.5 m (5 ft) long.

3. Angel shark have long needle like teeth. Their jaws are underneath.

4. They bury themselves in sand or mud lying in wait for prey.

5. They eat fish, crustaceans, and various types of mollusks.

6. They are ovoviviparous. And they can have a litter of up to 13 pups.

7. The Angel shark is not aggressive but will bite when stepped on or handled. But if you leave them alone they will not attack.

8. They occur worldwide in temperate and tropical seas.

9. Most species are found in shallow temperate or tropical seas but one species inhabits deeper water down to 1,300 meters (4,300 ft).

All of this info is from

1. The Graceful shark is found in the Indo-Pacific ocean.

2. It grows up to a length of 1.6m long.

3. It can be seen on the surface or found down 5m deep.

This is where the Graceful shark lives

4. This shark is not on the threatened list.

All of this info is from

Above the Galapagos shark

1. The Galapagos shark is found mainly off tropical oceanic islands. In the Atlantic Ocean, the Indian Ocean and Pacific. Galapagos sharks are generally found over continental and insular shelves near the coast and preferring rugged reef habitats with clear water and strong converging currents. This shark is known to cross the open ocean between islands. Juveniles are found deeper than 25 m (82 ft) while adults have been reported to a depth of 180 m (590 ft).

2. The Galapagos shark reaches 3.0 m (9.8 ft) long. The maximum reported length is 3.7 m (12 ft) and the maximum reported weight is 85.5 kg (188 lb).

3. When the Galapagos shark are confronted or cornered they may perform a threat display similar to that of the grey reef shark. Arching their backs lowering its pectoral fins and puffing out its gills, gaping its jaw. The shark may also swing its head from side to side so as to keep the perceived threat within its field of vision.

4. The Galapagos sharks feeds on bony fishes and eels, sea bass, flatfish, flatheads, triggerfis and octopuses. They sometimes have mackerel, flyingfish, and squid. As the sharks grow larger they eat rays and smaller sharks of their own species.

5. The Galapagos shark exhibits a viviparous mode of reproduction in which the developing embryos are sustained by a placental connection formed from the depleted yolk sac. Females bear young once every 2–3 years. Mating takes place from January to March. The gestation period is estimated to be around one year the spring following females move into shallow nursery areas and give birth to 4–16 pups. The size at birth has been reported to be 61–80 cm. Males mature at 2.1–2.5 m (6.9–8.2 ft) long and 6–8 years old while females mature at 2.2–2.5 m (7.2–8.2 ft) long and 7–9 years old. The lifespan of this shark is at least 24 years.

6. The Galapagos shark is regarded as dangerous to humans and diving unprotected is not advisable in areas where they are abundant. They are known to approach close to swimmers showing interest in swim fins or hands. As of 2008 the Galapagos shark has been confirmed to have attacked two people one fatal attack in the Virgin Islands and a second non-fatal attack off Bermuda.

All of this info is from