The Unique Nature of the Tuna

Overfishing has become an enormous problem all over the world. The impact of the increasing demand for fish and the advanced techniques made in the area of commercial fishing has caused some species of fish to be virtually extinct. In fact, some species like the giant bluefin tuna widely used by Japanese chefs and served in many restaurants, are now just few years away from extinction.

The purpose of this experiment is to perform a procedure known as SDS-PAGE (sodium dodecyl sulfate - polyacrylamide gel electrophoresis) in order to determine protein profiles for seven fish species: Yellow Tuna (Thunnus albacares), Thresher Shark (Alopias vulpinus), Paiche (Arapaima gigas), Swordfish (Xiphias gladius), Catfish (Ameiurus catus), Coho Salmon (Oncorhynchus kisutch), and Rainbow Trout (Oncorhynchus mykiss). The gel electrophoresis separates the fish muscle proteins according to their molecular weights, which allows one to determine a profile for each specie.

Both temperature and chemical changes to the environment were observed to effect the daphnia’s heart rate. Increasing water temperature

There is a common conception that due to the immense size of oceans and it’s species’ richness, species population decline is a rarity. However, such decline may result in a damaged marine ecosystem. A top predator that plays a key role in the marine ecosystem is the Atlantic Bluefin Tuna, Thunnus thynnus. This species is a warm blooded predator that are “highly migratory species that may reach a weight of 900 kg” (). The Western Northern Atlantic Bluefin Tuna migrate primarily to the Gulf of Mexico for spawning during late spring where “larvae are in preferred water temperature ranging from 20 degrees Celsius to 25 degree Celsius” (). They then migrate back to the northern West Atlantic for feeding where there “life span is an average of

If the size of the herring affects the carrying capacity of the Atlantic Bluefin Tuna then, the carrying capacity of the Atlantic Bluefin Tuna will increase if there is an increase in size of herring than if there is no to minimal change in size of herring.

With smaller tuna fisheries more and more fishermen are using hook a line methods of catching tuna. Meaning that a fisherman would throw a single line in the water and pull out a tuna. If the fish wasn’t a tuna or if the tuna was to small they would be

One of the important thing I have learned is how tuna stay warm with cold hearts. how animals react to rapid temperature changes, knowledge that’s becoming more essential as the earth warms. Pacific bluefin tuna are top predators renowned for their epic migrations across the Pacific Ocean. They are also unique amongst bony fish as they are warm bodied (endothermic) and are capable of elevating their

When placed in a larger flask, the Danio rerio will consume more oxygen and increase their metabolic rate, because the more they are able to actively swim around, the more water will be continuously pumping into its mouth and across their gills. In the experiment, the amount of oxygen consumption was measured over a 30 minute time period by a Logger Pro instrument. Four different flask sizes were used to change the environment of each zebrafish. By manipulating the size of flask, the experiment was able to study how each environment around the zebrafish affected its metabolic rate. The total amount of oxygen consumed during the experiment was calculated through the difference of oxygen present in the closed system at the beginning and end of the experiment. The metabolic rate was calculated with respect to each individual zebrafish.

The little tunny, Euthynnus alletteratus, is a common species of tuna and a popular sport fish inhabiting the Atlantic. Relatively small in size, the little tunny may grow to be a meter in length, although they are often much smaller. This species can weigh up to 12 kg, but, as stated with their length, tend to be much smaller (Robins, 1986). Similar to other species of tuna, the little tunny has a fusiform body shape that allows for efficient movement through water and they lack a swimbladder. They also possess a keel along each side of their narrow

“A single Pacific bluefin tuna sells at auction for more than $100,000” (Arnold, 2012). The Pacific bluefin tuna is one of the most popular fish consumed in the world eaten mainly in sushi. In 2010 alone, the United States consumed twenty-four percent of the tuna consumed by the entire population. Due to its increasing growth in popularity the demand for wild bluefin tuna has caused the species to drastically decline to about 2 percent of its original percent population causing it to become endangered. Due to the drop in the amount of wild bluefin tuna left there have been serious changes to the ocean’s ecosystem. The Pacific blue fin tuna is one of the top predators in the pacific oceans food chain making it a tertiary consumer. For them to survive it must feed on the Ocean’s secondary consumers which are the anchovies, herring, etc.

Due to this, the main purpose of this report is to discuss the various attributes of whales which have assisted in their survival and adaptation in their environments. This includes morphological adaptations such as size, mouth structure, and their body shape; physiological adaptations such as Respiration and their blubber. The report also focuses on behavioural adaptations which discuss migration, and their use of communication. The issues regarding the destruction of whale’s habitats due to the increase of ships on today’s oceans and climate change is also discussed in this report as well as possible solution which could prevent the possibility of extinction for the Blue Whale.

Fish are divided into two major types depending on its skeleton structure; which is cartilaginous fishes and bony fishes. Some of the adaption was changing in the muscle weight and bone weight so it can help them to swim faster to escaping from the

The common name for “Thunnus thynnus,” is bluefin tuna. It includes three of the eight species: the southern bluefin tuna (Thunnus maccoyii), northern bluefin tuna (Thunnus thynnus), also known as the Atlantic bluefin tuna, and the Pacific bluefin tuna (Thunnus orientalis). The scientific classification of the Bluefin is: Animaila (Kingdom), Chordata (Phylum), Actinopterygii (Class), Perciformes (Order), Scombridae (Family), and Thunnus (Genus).

Swimming in the lower chordates is made possible due to the arrangements of the muscles in fish. There are muscles on both the left and right side of the fish’s body that act in tandem to move the fish forward through the extremely dense water. When the muscles on the left contract, the muscles on the right relax allowing the fish to move in “s” shaped waves through the body of water. The muscles are arranged in segments, allowing for different muscles on the same side to either expand or contract simultaneously. Nerve impulses are what signal the muscles to either expand or contract accordingly. Multiple bends in the fishes body are a key aspect that allows the fish to propel forward. It is essential for a highly active fish to have what is

The shape of the caudal fin corresponds to the speed of the fish. Rounded fins are effective for speed and maneuvering, but since they produce a lot of drag, they slow the fish down. Forked and crescent fins have less drag, so they good for swimming very fast over long distances. However, the forked fins are better for maneuvering than crescent fins.