Hence, overfishing threatens coastal nations down to the local level, devastating communities whose dominant sources of labor and revenue hinges on healthy, plentiful stocks of fish. Also, marine life imbalance may affect the targeted fishing of top predators such as billfish, sharks and tuna that eventually disturbs marine communities. In fact, it is causing increased abundance of smaller marine animals at the bottom of the food chain. This in turn has impacts on the rest of the marine ecosystem, such as the increased growth of algae and threats to coral reef health. Overfishing is also closely tied to by catch, another serious marine threat that causes the needless loss of billions of fish, along with marine turtles and
A change in the water 's temperature or chemical makeup can be deadly for polyps. Experts say that putting a stop to things that are harming coral reefs is a must. But they are also looking into ways to regrow them. Recently, scientists started raising coral polyps. They plan to put these polyps on struggling coral reefs.
These fish help clean the algae that grow over the reef, lowers the algae levels to support enough oxygen for coral to grow, and to establish efficient space for baby coral. There are three main ideas of how we as a community and as a nation can attempt to eliminate lionfish: spread
Feeding habits and role in the food chain: Daphnia feeds mainly on unicellular algae, yeast and bacteria. Upon feeding, Daphnia uses its third pair legs to filter the water allowing the proper food size in while keeping the large particles out. Beating the water with the other sets of legs create water current that brings in additional food. The feeding habit of Daphnia explains their ecological role as their lower density and consequently less food consumption could lead to algal overgrowth along with possible decline in dissolved oxygen during night. On the other hand, the importance of Daphnia in the food chain is significant as Daphnia is preyed upon by several aquatic organisms such as tadpoles, salamanders, aquatic insects, and many of small fish species.
Populations of these animals either increase dramatically or decrease dramatically, e.g. the crabs that would eat these fish in 1992 had their populations increase suddenly, due to the loss of their main predator, whereas shark numbers and other predators of the fish would decrease due to lack of food. As a result, these animals will hunt other fish and decrease the population and etc, resulting in a mass increase and decrease of populations in the ocean. Some major issues surrounding overfishing are environmental sustainability, unemployment and economic loss. The questions that the issue of overfishing poses are ‘do the benefits of overfishing outweigh the disadvantages?’ or ‘how can people change the method of catch in order to provide enough food for people whilst preserving populations?’ National/Local Perspective in Hong
Coral bleaching is when the animals that build the coral shed the algae that give them their color and is necessary for survival. Coral bleaching is suspected to happen by two different ways. The first is due to warmer water. The coral needs to be in certain temperature in order to maintain its life. The second way is due to pollution.
The cell death leads to the expulsion of the zooxanthellae from the corals, which eventually will lead to coral bleaching. Zooxanthellae give corals their color. Symbiodinium are responsible for the majority of coral’s energy (Berkelmans 2006). A coevolutionary relationship is necessary for coral reefs to thrive. This symbiotic relationship is effective in recycling nutrients and using light (Berkelmans 2006).
1. 90-100 million tons are killed and wiped off the planet each year. Consisting of some of the most beautiful creatures on the planet. Fish are a primary food source to 3.5 billion people worldwide and the depletion of the species is leaving millions of people hungry. Over fishing is a huge problem that needs to be stopped.
While juvenile abalone grazes for algae, diatoms and bacterial films, adults rely on drift algae, and if food becomes scares, they move after their food. Under farming conditions where most of abalones are produced, the macroalgae are the main abalone feed.However, many abalone farms use successfully high quality manufactured feed which has been found healthy and efficient in the production of high-quality
Without these medications, a lot more of the human population will be in danger without medication to have when they are sick. Cho also tells us that reefs provide us with construction materials like limestone, and shoreline protection through waves, storms, and flood. The corals act as a buffer by forming barriers to protect the shorelines. According to The Reef Resilience Network, “500 million people rely on coral reefs for food, coastal protection, and livelihoods. ,”, but, “Losing the coral reefs would have profound social and economic impacts on many countries, especially small island nations like Haiti, Fiji, Indonesia, and the Philippines that depend on coral reefs for their livelihoods.”(#7) (add