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the biggest threat dolphins are tuna nets that dolphins are gettting caught in fishing nets when catching fish such as tuna
they are endangered because they get caught in fishing nets and people hunt them for food
Plastic bags and fishing nets are killing dolphins. Also the plastic holding a six pack together is hurting dolphins.
Tuna
they don't they get caught in them all the time
Nets and whalers and hunters
they get caught in fishing nets and are covered by other fish and cant get up to breath so they die.
Because they keep getting killed (e.g. by getting caught in fisherman's nets, hunted etc.) at such a rate that it is difficult for them to breed.
Because they don't get caught up and killed in the mesh of large fishing nets
yes.
Bottlenose dolphins are not extinct but they are classed as not endangered and least concerned as their population isn't at risk as of yet. However they are at risk of extinction if tuna fishing happens as they swim with tuna fishes and can get caught in the nets. As an result, they can die. Reason for this is that tailspins would swim with common fishes and this creates an opportunity for fisherman vessels to kill bottlenose dolphins in inadvertently way. Meaning they are killed by accident but some would sell bottlenose dolphins as a different dolphin species or not as a dolphin so that it's legally sold.
Japanese, Sharks and fishing nets