Fish migration

Introduction: Galaxiids are freshwater fish belonging to the galxiidae family. There are migratory and non-migratory species found in New Zealand. The migratory galaxiid fish that are native to New Zealand, are the Giant kōkopu (Galaxias argenteus), short-jaw kōkopu (Galaxias postvectis) and the banded kōkopu (Galaxias fasciatus) (DOC, 2010). Galaxiids generally breed in Autumn and their breeding and migratory patterns differ depending on the species (DOC, 2010). The adults of kōkopu species…

stress of animals and interfere with the sound-based orientation. Biotic and abiotic sounds are the two components of underwater environment produced by fish and mammals in order to communicate and orient. Acoustic masking is one of the main effects of noise pollutions on marine animals. The noise from boating and shipping has an effect on fish and hearing abilities and physiological damage on their hearing systems. The sound of the boats also avoids responses in the herring. Some noises made…

“Sharks, like other fish, will exhibit a behavior called test biting”. Test biting is what it sounds like: an action in which a marine predator bites potential prey to see if it is consumable by their standards. Nevertheless, according to Shark Sider, sharks never finish what…

get any recognition. Block has blown the minds of scientists through her research with large fish. Her studies of the Bluefin Tuna fish and Great White Sharks have increased not only her education but other people’s as well. She has been in the field of Marine Biology for over twenty years and is going to continue to widen her data range. If it weren’t for Barbara Block, the hotspots where Bluefin Tuna fish use for mating would have never been fully protected. Also, the tracking devices for…

as little as 0.005 microvolts. This "sixth sense" is useful in tracking prey's movement from long distances. In fact, they can feel disturbances in the water from up to a mile away. When great white sharks are young, they feed on smaller prey, like fish and rays. As they grow larger, they feed more exclusively on marine mammals, such as sea lions, seals, and small whales. The great white is at the top of the food chain and has few threats in the ocean. Only orcas and larger sharks can…

assist scientists researching migratory behavior of baleen whales. Most baleen whales migrate 3,000 to 5,000 km (1,800-3,000 miles) each way, depending on the species. Gray whales migrate more than 10,000 km (6,000 miles) each way - the longest known migration for any mammal. Some species migrate much shorter distances. For example, Bryde's whales only move from temperate regions to the equator. And sei whales don't migrate as far toward the poles as most species…

reacting to pesticides, and evolving so that they’re immune to the toxicity. For example, tomcod fish have become resistant to a toxin that has been dumped in a New York City river, and the species developed this over only took a few decades. Many examples are given to…

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 blowhole. They use echolocation to identify…

In 1975 director Steven Spielberg released the soon to be award winning movie Jaws. The adventure and also thriller movie cost eight million to make. Then racked up two hundred sixty million in the box office during its whole release in theatres. The inspiration for this movie, was brought from a real life story. When four people were killed by a great white in a sequence of attacks near the sea, in 1919, it was later caught and killed by two amateur fishermen. The two lead actors in Jaws are…

than 1,500 km long. Shark bay has a very diverse ecosystem but is mostly steered by aquatic abiotic and biotic factors. The biotic factors of Shark Bay are much more distinct than the abiotic factors. The biotic factors include numerous species of fish and other aquatic creatures (sharks, dolphins etc.), invertebrates (centipedes, spiders and millipedes),…