Biology: The average length of a Skipjack Tuna is 32 inches long (80cm) and weigh anywhere between 7-22 pounds (8-10kg). The current record for the biggest Skipjack Tuna weighs in at 76 pounds (34.5kg) and was 43 inches long (108cm). The colour of the top region is either dark blue or purple, and the lower region including the belly are primarily a silver colour with anywhere from 4-6 dark, broken lines that run across the body (FLMNH). The body shape is elongated and possesses a fusiform shape, meaning it is wide in the middle and tapers at both ends; it also possesses a bilateral symmetry. There are two dorsal fins present, the first consisting of around 14-16 spines. There is a small gap in between the two fins, and the second fin is spineless (ADW) (FLMNH). Behind the second dorsal fin, are between 7-9 finlets, which aid the fish in “reducing turbulence and maintaining directional control when swimming at high speeds” (Gardieff, Susie). On the underlying side of the Tuna, the anal fin is present and it is in about the same location below the second dorsal fin, and following the anal fin is another 7-8 finlets. The fish has short pectoral fins consisting of between 26-27 rays. The fish also have a single row of teeth, shaped conically (cone shaped) (FLMNH).
Reproduction: Skipjack Tuna are oviparous, meaning they lay eggs that mature and eventually hatch. In the warmer, tropical waters, the fish spawn all year long whereas in areas further away from the equator such as the North Sea, spawning is limited to the warmer months (FLMNH). The average age at sexual or reproductive maturity for both male and female Skipjack Tuna is roughly around 1.5 years of age (ADW) and can also mature at a size of around 15 inches (40cm) long (FL...
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...e use of FAD-associated purse seine caught tuna and will only sell tuna caught using environmentally responsible methods, currently defined to include pole & line and un-associated purse seine.” (JW). Some other conservation groups include the Inter-American Tropical Tuna Commission who works with the Government of member nations in the group to examine the human effects on tuna population and give recommendations on the amount that should be caught to keep a sustained population. WWF is another large group who collaborate with numerous other groups to help the population. Two such collaborations are with the Marine Stewardship Council (MSC) who work by certifying tuna fisheries, and encouraging retailers to buy from MSC certified fisheries and the International Seafood Sustainability Foundation who help in the conservation and management of tuna populations (WWF).
Fish fins developed around 500 million years ago. A fin is a thin appendage attached to the body of an organism that causes either propulsion, stabilization, or the ability to steer and brake. The median caudal, dorsal, and anal fins are possessed by most fish species. The rainbow trout has six different types of fins- an anal fin, an adipose fin, a dorsal fin, a caudal fin, a pair of pelvic fins, and a pair of pectoral fins.
In the past twenty years a large amount of bottlenose dolphin have been killed due to the tuna fishery. In the Eastern Pacific swim large schools of tuna, these shoals tend to be under herds of dolphins, for some unexplained reason. Because of this, fishermen can easily find schools of tuna. The tuna are being caught under purse seine nets, which encircles the shoals of tuna and then is pulled back on board the fishing vessel, catching both tuna and dolphin. Initially the mortality rate was 500,000 each year for dolphins alone. Although some efforts are made to encourage the dolphins to leave the net by backing down part of the net, which allows the dolphins to escape, there are still a large number of mortalities (Bryant). On the other hand, in the last few years there has been dramatic progress in stopping the fishing industries from using purse sine nets. It has been found that dolphins are in immediate danger of extinction if these fishing techniques don’t stop.
The quest to gain international agreement on ethical and legal norms for regulation of whaling has had a long and troubled history. The modern phase of global concern over whaling ethics and conservationist management originated in 1946, when the International Convention on Regulation of Whaling was signed. Thus, the International Whaling Commission was created. The International Whaling Commission was designed to control and mandate the whaling industry. From it’s beginning as simply a whalers club with scientific guidance, to the current day conservationist body, the IWC has undergone many revisions and transformations since the start.
The normal weight of M. salmoides is one kilogram; however, certain largemouth basses have gotten weights of over ten kilograms. Males usually do not surpass 40 cm, while females can reach up to 56 cm in length. The largemouth bass has a large, slightly sloping mouth. Its body is slender to robust, slightly compressed laterally, and oval in cross section. The corner of the mouth extends past the eye, hence its common name. (Bailey, et al., 2004; Boschung, et al., 2004) Immature Micropterus salmoides feed on zooplankton and marine insects. As they grow their diet shifts to crayfish
...to 300 individuals, the newborn seahorses are independent of parental care and the male is free to fertilize and accept more eggs(Lourie 11). The offspring bearing roles displayed by Hippocampus spp. is an extreme shift in relation to many other species of kingdom Animalia, of which the bearing of young is predominantly carried out by females. According to Foster, growth rates throughout the life cycle and the duration of the life cycle of seahorses in the wild varies between species and cannot be determined due to insufficient research data(foster 22). Once sexual maturity is reached, often determined by the presence of a brood pouch in males, adults are able to reproduce. During reproduction, the overwhelming majority of Hippocampus species display monogamous behaviors, usually mating with the same partner for the duration of the mating cycle(lourie 10-11).
While mating, the male shark fertilizes the eggs by inserting its clasper to the oviduct of the female shark. What happens after the fertilization varies from one species to another. There are shark species that lays their eggs while covered in a protective tissue. These eggs later hatch into young fish. Other species give birth to live young ones and then abandons them.
In 2007, the Convention on International Trade in Endangered Species banned international trade on Knifetooth Sawfish, which would help protect the lives of many populations (arkive.org, 2012). Also, the Knifetooth Sawfish is legally protected in India, and Australia is closely researching plans to help preserve the habitats of these sawfish (arkive.org, 2012). Research alone is important because in turn the governing body of that region is at least searching for the best possible solution for the long term. Without these steps, the Knifetooth Sawfish may well be gone at any rate. Despite humanity's ignorance to avoid the situation at all, at least it is still possible to amend the situation. The Convention on International Trade in Endangered Species is doing its best to express the importance of sustaining the Knifetooth Sawfish to an extent (arkive.org,
To fish or not to fish is a personal choice. The fact that the oceans are being overfished is a growing concern for individuals, organizations, and governments throughout the world. In this paper I want to discuss the effects of overfishing on the restaurant industry, and possible solutions to solve the problem. Fishing is an ongoing source of food for people around the world. In many countries it is a food staple in their everyday diet. In more modern societies eating fish has become a sensual experience, and not just for the wealthy. It hasn't been until population explosions in the last century that the demand for seafood has led to more effective fishing techniques and technologies. Now the demand for popular fish like the salmon, tuna, sea bass, cod and hoki, which is the key fish in McDonalds filet o' fish, is diving wild populations to dangerously low levels. The methods used to catch the amount of fish demanded by the industry do not leave sustainable populations in the wild. In an attempt to preserve the fish population, governments have set limits on the minimum size that may be harvested and how many of each may be taken. Boundaries have been set up saying which areas can be fished and which ones should be left alone. A number of smaller fisheries have gone out of business because of the limits imposed by the government. This leads to even less fish being harvested and brought to market. Therefore the amount and varieties of fish at markets are smaller and can cause shortages for wholesalers and restaurants. Some restaurants will no longer have the variety on their menus that they used to enjoy. If a restaurant thrives on its seafood menu they may be unable to cope with the shortages and will go out of business. In the ...
Overfishing is a harmful practice, that will eventually lead to the collapse of aquatic ecosystems, if it’s not dealt with promptly. Overfishing emerges from the combination of our over consumptive society mixed with the great profits that come from hauling in a good catch. The consumers demand for fish in Japan seems to be at an increasingly high rate due to the enjoyment and cultural values that arise from sushi and other traditional dishes involving seafood. Approximately 23 percent of Japan’s protein intake comes from the ocean, and as a nation consumes 7.5 million tonnes of seafood annually. CITATION
I still remember the day as if it were yesterday, the day I reeled in my first yellowfin tuna. The morning started off as any other morning, wake up, shower, and dress but this day I ended up on a boat destined to head for the oil rigs off the coast of Louisiana. It was a long and cold ride out to the rigs, about one and a half hours of hitting waves as we all cuddled up at the stern.
...n in Starfish Caught by Towed Demersal Fishing Gears." Marine Biology 138.3 (2001): 527-36. Print.
The Channel Catfishes mating habits are similar to most catfish. The male channel catfish only has a single mate during the mating season. A Channel Catfish usually finds its mate before mating season starts. The usual mating season for a Channel Catfish is between May and July. Depending on when the water is around seventy-five degrees. The process of mating starts off when the male Channel Catfish swims next to the female but is facing the opposite direction. The male and female place their tails around the others head. Once they are all wrapped up...
Ray finned fish, or Actinopterygii, have bases of fins called radials that are parallel bones incorporated in their flesh. Actinopterygii are the most common and dominant class of vertebrates, and have been more than 35,000 fish. From marine environments with fresh water, they occur in diverse forms and features. The oarfish, catfish, eel, are lower classifications of the ray-finned fish, and are now considered the top taxonomic class of fish because over 90% of fish have Actinopterygii characteristics. Their fins are called “rays” because of the horny spines, opposed to the flesh, lobed fins of other fish. Since these fish are extraordinarily diverse in their habitat, they are considered the common food of mammals. Trout, Herring and Alaska Pollock fish are one of the most common catch in North Atlantic, residing on the American coast, and across Europe. (Book of fish 33).
Female clownfish lays her eggs in hundreds or thousands depending on species. Eggs are laid on flat surfaces close to their host anemone. The male parent will usually guard the eggs until they hatch in about 6 to 10 days depending on water temperature. The male continues to take care of the hatched fry until they reach sexual
As the demand for seafood has increased worldwide, the fish industry has been changing over the years as well. The ocean is not how it used to be, nor the quantity of fishes or the condition of the ecosystems within these waters. Human behavior and food trends are reflected in the demand for fish over the world, and as this demand increases the capturing methods has changed too, causing a horrific effect called “Overfishing.” In order to show the major events, causes, and consequences of the industrialization of fishing, this timeline will focus on the history of overfishing during the last 80 years. The main goal of this timeline is to inform the audience the impact of overfishing since the industrialization of food started, and to change