The
oceans cover nearly two thirds of the Earth's surface, and are continuously threatened by human behaviors and practices. By taking so many fish from the seas, humans have managed to remove entire links from the
marine food chain. This causes a chain effect, leading to an overall upset of the delicate ecological balance.
Sharks are one of the ocean's most threatened groups (see
list of threatened sharks) because they are mistakenly caught by vessels searching for fish, and end up getting tossed back into the ocean dead or dying Some
Asian cuisines value
shark fin as a
delicacy, incentivizing excessive catching of sharks and even
finning practice among
unregulated fishermen. This disappearance of sharks has enabled prey animals like
rays to multiply, which alters the food chain dynamics.
Bycatch is the industry term for what they consider "unwanted or economically-worthless aquatic animals who are unintentionally caught using destructively indiscriminate fishing methods like
longlines and
driftnets, which generally target marketable marine creatures such as
tuna and
swordfish"
Fish farming is the raising of fish for food in underwater enclosures, otherwise known as
aquaculture. There are environmental hazards such as waste, damage to ecosystems, and negative effects on humans. Because they are so densely packed together, the fecal matter that accumulates can create
algal blooms, or deadly parasites and viruses that thrive on the filthy environment. These can infect wild fish that swim near the enclosure, or whole colonies of fish if an infected farm fish escapes the enclosure. Despite these concerns, advancements in sustainable aquaculture practices offer potential solutions for reducing pressure on natural fisheries.
Overfishing occurs because fish are captured at a faster rate than they can reproduce. Both advanced fishing technologies and increased demand for fish have resulted in overfishing. The Food and Agricultural Organization has reported that "about 25 percent of the world's captured fish end up thrown overboard because they are caught unintentionally (bycatch), are illegal market species, or are of inferior quality and size" It should not go unnoticed that overfishing has caused more ecological extinction than any other human influence on coastal ecosystems. The global environmental problem of oceanic
microplastics is largely caused by plastic-made fishing gear that is wearing down by use, lost or thrown away. This has become an increasing problem and threatens the lives of a lot of sea life. This can disrupt food webs, decrease fertility and harm biodiversity. == See also ==