Most coral reef fish have spines in their fins like this .

3. Farm-bred fish have been found to have high concentrations of antibiotics and pesticides
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The law does not require children 14 years of age and under to obtain fishing licenses; however they must actively participate and be able to demonstrate the ability to handle the gear by themselves. They must follow all the rules and restrictions for that particular species and/or body of water and are allowed the same daily limit as an adult. Adults may assist and are not required to have a license if they will not be fishing/harvesting themselves, but children must be present and take part in the entire process.
Bony fish have no . Mucus glands coat the body. Most have smooth and overlapping ,  or  scales.
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There are two types of nerve fibre relevant to pain in fish. are a type of sensory nerve fibre which lack a sheath and have a small diameter, meaning they have a low . The suffering that humans associate with burns, toothaches, or crushing injury are caused by C fibre activity. A typical human nerve contains 83% Group C nerve fibres. are another type of sensory nerve fibre, however, these are myelinated and therefore transmit impulses faster than non-myelinated C fibres. A-delta fibres carry cold, pressure and some pain signals, and are associated with acute pain that results in "pulling away" from noxious stimuli. This year's Fishing Derby is statewide! You shouldn't have to travel far to win prizes.
Photo provided by FlickrDifferent groups of fish have  a number of modified scales to serve various functions.
Photo provided by FlickrLungfish are , feeding on fish, , , , ,  and plant matter. They have an  rather than a true .
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Of course, stingfish don’t actually have legs. Instead, parts of the fish’s pectoral fins have separated through evolution. According to , a marine biologist at the Kagoshima University Museum in Japan, stingfish and their relatives use these “pectoral filaments” to probe the mud for worms and crustaceans. (See more pictures of .)The team of Australian government scientists studying these unexplored areas of the ocean—on a —uses nets, sonar, and deep-sea cameras to identify many new species. They have found bright red spiky rock crabs, coffinfish, blind sea spiders, and deep-sea eels since they set out on May 15.The fish, which was first found off the coast of Papua New Guinea in 1873, was spotted a second time during the scientists’ expedition near Australia's eastern seaboard, 2.5 miles below the ocean surface. It doesn't have any eyes, and its mouth is underneath its body, giving it the appearance of not having a face.Eating contaminated fish is the number one cause of mercury exposure in America. Mercury is spewed into the air from coal-burning power plants and factories. That pollution can travel halfway around the world and then settle into lakes, rivers, and oceans, where it is absorbed or ingested by small organisms and then starts working its way up the food chain, its concentration rising with each step. Big predatory fish, like sharks or tuna, can have especially high concentrations in their bodies.“In order to understand food web entirely, you have to know both the base of the food web – like the algae and the invertebrates – and then the fish. And if you want to know how much food is available for one species, say an endangered fish species, you have to have a perspective on all the other fish that live in the river, what do all those fish want to eat, and how much. So it’s not just how big the grocery store is, but how often is that grocery store being resupplied with food resources. So what we talk about with the amount of insects in the river system is ‘is the grocery store full to feed the fish?’” What's more, anything called a fish, by definition, can't have a neck. The moment a fish-like creature developed a neck, it became classified as another type of animal, experts told Live Science.