Dorsal fin

Urochordates are tunicate-like creatures which filter feed and remain sessile and form large colonies. These organisms showed the early signs of a dorsal nerve chord with the notochord, which connected one end of the body to the other. Cephalochordates are lancelet-like organisms which, much like Urochordates, are filter feeders. These organisms lacked brains, well-structured heads, and sense organs…

*Stridulatory sounds are produced by friction of teeth, fins, spines or bones. *In fishes, stridulation often occurs during feeding when jaw teeth or pharyngeal teeth are gnashed together.…

survive. An Orca is a black and white colored species of the Delphinidae family, Genius Orcinus and weighs approximately six tons (Bradford). They have a long dorsal fin on their back, very sharp 4 inch teeth, and live in many different climates (Bradford). In the wild, less than one percent of orcas experience dorsal collapse or a “floppy” dorsal fin (“Blackfish”). Orcas live in close-knit family groups where mothers and other members of the family help care for the offspring…

often, sharks are hunted for their fins to make shark fin soup. When they are hunted, most times the rest of the shark is discarded. While some sharks eat smaller sharks or young sharks, called “pups”, people are more dangerous than this. To help prevent the hunting of these creatures, it is now illegal to hunt great white sharks along the coast of Florida. When most people think of a shark, they most likely think of a big fish with sharp teeth and a dorsal fin sticking out of the water.…

protect them from the sun, so they get badly sunburned. To cover this up, SeaWorld applies black zinc oxide to camouflage the burns (PETA, "10 Things You Didn 't Know About SeaWorld.") Within marine mammals, and particularly killer whales, a collapsed dorsal fin…

At least 19 orcas have been taken from the wild and put into captivity since 2002. When killer whales were first put on display, the image of this black and white icon was seen as a fearsome killer. Killer whales are beautiful, majestic creatures in the wild, however, this is not always displayed while in captivity. Captivity can change these magnificent creatures to a creature that some people may fear. Captivity has been proven to cause negative physical and social effects on killer whales…

Dolphins are one of the most interesting animals in the marine life. From the way they communicate with each other, to their friendly way around other animals or humans, these animals are pretty well known in the marine world. The name dolphin comes from the Greek word delphis which means “fish with a womb”. Dolphins belong to the taxonomic category “Odontoceti” which also means “toothed whale”. Dolphins match these characteristics of an “Odontoceti”, such as, they have teeth and a single…

and can be found in groups of only 1 to 6, but are usually independent. Almost never approach boats, instead attempting to avoid them, shows how shy they really are. Their shyness is also shown by how people almost never seen more than their small dorsal fin breaking the water. They also usually hunt for food independently. Their very shy nature and very small shape causes them to be very different from the Bottlenose Dolphin (Dunn, Harrop, Still 88).…

Part III : Water Parameters ( for pump-ashore tanks ) 1. Water quality Heavy metals shall not in the water and hygiene of the water shall be taken care to prevent unnecessary bacteria infection during yolk-sac frys stage and hatching period. Uneaten food and feces must be removed to prevent ammonia level increases which will cause the mortality rate increases. 2. pH pH level should be between 6 to 7 as optimum level to culture the frys. 3. Currents The water currents shall not be too strong.…

have moulded evolution for 450 million years. All fish species that are prey to the sharks have had their behaviour, their speed, their camouflage, their defense mechanisms moulded by the shark.” – Paul Watson. Sharks are cartilaginous fish with pair fins and nares, two chambered hearts and jaws. These characteristics are unique to the class, chondrichthyes. Ray, skates, and chimaeras are members of this class and sharks closest relatives. Shark fossil aren’t like dinosaur fossils, because…