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.
Both recreational and commercial fishing have a huge impact on overfishing, by keeping under sized fish and other aquatic life. Not only do fish have to worry about fishermen but they also have to worry about each other, fish deplete their own population by feeding on one another. For example, Betta fish are known to eat fish of the same species but can live peacefully with fish of another species. Therefore, humans should embrace and follow fishing laws rather than try to sneak
When it is stimulated the chromatophore produces black, red, brown and yellow colors (Mäthger et al. 2005). A band of muscles that originate from the chromatophores allows the cuttlefish to change the color pattern according to its surrounding by relaxing the muscles to alter the different color layer (Chiao and Halton
Believe it or not we are all a witness of watching someone litter, or us littering. From planktons, to dolphins to birds can be affected by a simple oil spill in the ocean and especially in a close area like the Persian Gulf can cause great damage. When oil is spilled, toxins in the water spike and will shock the bodily systems of the animals living there, causing a massive amount of death and leading to endangerment. Before disaster had struck in 1991, the Persian gulf has beautiful clean beaches, filled with marine life. Beautiful clear, lushes water.
72580 Rodriguez Silva The Top-down Effects of Brine Shrimp on Algae INTRODUCTION An ecosystem is a delicate structure moderated by the network of interactions between all of the organisms that inhabit it. These organisms can be arranged into trophic levels, forming a chain or pyramid in which energy flows from one level to another. In a top-down trophic cascade, the higher-leveled consumers regulate and dictate the biomass of the trophic levels below (Leroux and Loreau 2015). The removal or addition of these consumers would initiate major changes in the survivability and overall diversity of most of the other species in the ecosystem. The balance between populations is maintained through natural growth and decline, predation, and resource
Most studies have traditionally sacrificed relatively large numbers of fish to examine their stomach contents. However, sacrificing fish for food habit studies may cause public relations issues. They may not be a convenient option if study fish which are threatened, endangered, economically valuable, or come from a low density population. Additionally, lethal methods may significantly alter the population structure of fish. Accordingly, a number of nonlethal methods were developed to obtain and analyse the gut content of fish.
To control the overfishing and growing industrial fishing market, in 1977 the Canadian Government introduced a 200 mile management zone but by that time most of the ecological damage had started. However, during this time other industries like resource-extraction failed, which put pressure on the fishing industry and even the government had to encourage more catching of fish for exports. However, as stocks of cod fish continued to drastically decline the government finally decided to ban cod fishing in 1992. Though the cod fishing industry boosted the Canadian economy and provided employment for local
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.
Lionfish are damaging the communities that live in coral reefs. If lionfish overtake a coral reef, they can consume over one-hundred types of species of fish. Also, the fish that lionfish consume are necessary for habitat health because they regulate algae. Lionfish have been known to exist in various new areas including Gulf of Mexico, the Caribbean, and the Atlantic Ocean (Morris, J.A., Jr., and P.E. Whitfield).
Destructive fishing methods cause harm to the reefs because the dynamite and cyanide or other methods used because they break up the fragile coral reef are highly unsustainable. Unsustainable tourism generates a lot of income for the host countries, the tourists damage the coral reefs by careless swimmers and divers, and poorly placed boat anchors. Then there is also the problem with the hotels and resorts have a tendency to discharge untreated sewage and waste water into the ocean, which pollutes the water and helps the growth of algae, which makes it harder for the coral reefs to grow and expand. The growth of coastal cities and towns that generate multiple threats to the coral reefs that are nearby because with the expansion of the cities or towns there is limited space airports and other constructions projects are taking up the space that the reefs need to survive. “Coral reefs are biological assemblages adapted to waters with low nutrient content, and the addition of nutrients favours species that disrupt the balance of the reef communities” ( The International Coral Reef Initiative).