Certain species have a huge impact to an ecosystem, but even the smallest fish could have the biggest impact. Overfishing occurs when more fish are caught than the population can replace through natural reproduction (overfishing). The results not only affect the balance of life in the oceans, but could also affect the coastal areas that depend on fish for their way of life. For centuries, our seas and oceans seem to be considered a limitless food supply. But that is not the case, increasing fishing efforts over the last fifty years as well as unjustifiable fishing practices are pushing many fish stocks to the point of extinction.
The cod fishing industry employed most of the population and also influenced other industries in the region to grown alongside such as the shipbuilding industry and the export of timber to European and Caribbean countries. When the government banned cod fishing in 1992, many people lost their jobs. Hence, Newfoundland’s fishing industry diversified and shellfish; the previously ignored group of fish now became the most valuable. After the cod collapse, Newfoundland’s major source of income were queen crabs and shrimp. However, many people were still left unemployed.
I grew up in Westfield, with you as my state legislative representative. In the course we learned about one of the biggest, arguably the biggest, threat facing the world’s oceans today: overfishing. Overfishing is when fish are being taken out of the ocean faster than they can reproduce. This is occurring all over the world, including right off our very own shores. This has a myriad of impact in the marine ecosystem and well beyond.
Sharks are much more useful when kept alive, and can be beneficial for several years; however, once they are dead there are no more benefits to be reaped besides what is originally obtained. The decrease in sharks can also be detrimental to many fisheries. Sharks feed on other carnivores down the food chain. Carnivores that sharks prey on often prey on creatures such as shellfish. Without sharks, there would be an increase in several other carnivores, leading to a vast decrease in the amount of shellfish and other herbivores in the sea, which can be detrimental to local fisheries.
This initiative should be considered by all governments as soon as possible in the hopes of saving the endangered sharks. Otherwise, without sharks, the ocean biological system will be unbalanced, thus affecting the entire food chain. If the populations of planktons or other small creatures increase, consequences will follow. The control and management of the oceans will be tougher if the population of small fishes were to greatly increase. The outbreak of diseases in the ocean will be induced and this may spread to rivers and lakes which will ultimately affect us since our drinking water would become
Tenebrosa, factors caused by living things, known as biotic factors, also play a role in the distribution of P.Maculata. The first important biotic factor key in a P.maculata’s life is predators. As mentioned prior this organism is unable to move quickly in the water and like all organisms in the ocean is hunted as a means of food. As it cannot ‘outrun’ predators the organism, to deter predators, releases a unique toxin identified as tetrodotoxin. This toxin is extremely harmful and successfully enhances the survival of P.Maculata.
Freshwater ecosystems have lost a greater proportion of their species and habitat than ecosystems on land or in the oceans; in addition, they are probably in greater danger of further losses from dams, pollution, overfishing, and other threats. In extent, freshwater ecosystems are quite limited, covering only about 1 percent of the Earth’s surface. Yet, they are highly diverse and contain a disproportionately large number of the world’s species." Freshwater life zones that provide important natural resources and natural services to human is being damaged and degraded by humans. • Increased habitat loss.
Invasive species alone, have a stronger negative affect on biodiversity than forest clearing, disease and pollution combined. For example, the Nile perch is a species of fish that was introduced to Lake Victoria as another resource for food. This new non-native fish quickly became a devastating predator and has eliminated over one hundred species of fish. The Nile perch was able to do this because they reproduced rapidly and they could out compete native fish for habitat and food. Invasive species are aggressive species that can control a newly introduced ecosystem by spreading quickly and taking over the
As they usually hunt old, weak or sick prey, they help to keep the prey population in good condition, healthy and strong, enabling these more naturally fit animals to reproduce and pass on their genes. The effects of removing sharks from ocean ecosystems, although complex and rather unpredictable, are very likely to be ecologically and economically damaging. Here are some reason why killing sharks is very bad: 1)Sharks are being fished at a rate faster than they can recover. Due to overexploitation and lack of proper management, many shark species are under considerable risk of unrecoverable decline with some species having declined to near extinction in recent years. According to reports, sharks are being killed at an alarming rate of up to 273 million worldwide per year.
In the sea salmon spend varying amounts of time feeding and growing in an environment rich in food resources (Ackerman, 2017). It has also been noted that salmon undergo their greatest feeding and growth in salt water. Salmon’s therefore may primarily migrate to the ocean in order to maximise their feeding potential so that they may in turn reach optimum growth (Larsen, 2006). Again, since the diet of salmon changes at smoltification from small to larger food, most of the food that the new diet may consist of might not be found in the rivers in the amounts that would be sufficient for the adult salmons (Standen et al, 2004). According to Ackerman (2017)The levels of energy (lipids and proteins) that the fish has amassed during its time out in the open ocean also correlate to the distance that the fish have to migrate back up freshwater to reach their spawning grounds.
They’re also tolerant of a broad range of environmental and climatic conditions, making them able to occupy many habitats. There are concerns that cane toads are the key factor in the decline of many native species. They endanger native frogs by consuming far more prey than them, approximately 200 food items per night, causing native frogs to need to compete for their food. They also possess highly toxic chemical predator defences which can kill many native predators, such as snakes and lizards that attempt to consume them (The biological effects, including lethal toxic ingestion, caused by Cane Toads). Due to these effects on the environment, a solution to the cane toad issue is urgent.
This shows that sharks are necessary for every eco-system and their destruction affects us in more ways then we can imagine. Sharks are very at-risk for over-fishing because they take a long time to reach the stage where they can reproduce and in general only have a few pups when they give birth. Most sharks only have one or two pups every time they give birth. These factors make the time-period