Salmon sharks are opportunistic feeders. This means that they will eat just about anything that they can catch. Because the salmon sharks are fast and can tolerate a wide range of temperatures in the water, they can move around for their prey. They are named after their favorite prey, the Pacific salmon. But apart from the salmon, these sharks will also eat other kinds of herring fish, squid, steelhead trout, sardines, codfish, lanternfishes, pomfrets, mackerel, and many others. They may even migrate for food, following the migration patterns of their preferred prey. This shark's salmon-eating instincts are so strong that it will follow the salmon as it swims through the ocean to reach the rivers, from Baja California to the Gulf of Alaska
Pupfish are known to adapt to extreme and isolated environments that are difficult for other animals to survive. These pupfish species can be endemic to desert water pools, brackish swamps, seas, lakes, and estuaries. They are primarily native to North America, South America, and the Caribbean sea areas, adapting coastal waters of California and perimeters of certain western salt lakes. The Ash Meadows Amargosa pupfish of Nevada can live in as little as a half-inch of water.
Flashlight fish, also called lantern-eye fish, are among the few species of non-deep-sea fishes to possess such organs. Bioluminescent bacteria create the light continuously, but each species has its own mechanism for decreasing the luminescence; when swimming, some fishes create a blinking effect by alternately covering and uncovering the light. They use this light in a rather brilliant way to confuse and distract predators, and also to attract food. They even use it to communicate!
The slimy sculpin is a nocturnal fish that usually spends most of its time on the stream bottom and seeks shelter under rocks and logs, especially during spawning season. When it swims, it sometimes appears to be "hopping" along the bottom because of its inefficient ability to swim. This is partly due to the absence of a swim bladder, which normally gives buoyancy to a fish. The fish has been studied in waters where there is current freshwater acidification. Sculpin were found to be less active and have lower rates of reproduction when found in these waters. For these reasons, slimy sculpin have been identified as a good indicator species for changes in acidification among lakes, ponds, and streams.
Spiderfishes occur in continental slope and abyssal waters of all oceans. They are some of the world's deepest living fishes, living at depths ranging from around 1000 m to over 6000 m. They occur in areas where the seabed is made up of ooze or very fine sand. Larvae are sometimes encountered in shallow water. It is a common strategy for the larvae of deepsea fishes to live in surface waters and descend to the depths as they mature. This is known as an ontogenetic vertical migration. This allows them to feed in comparatively prey-rich waters. Some species of spiderfishes are capable of splaying the elongate pelvic and anal fins allowing them to rest, tripod-like on the bottom, with the body raised above the soft mud. The elongate pectoral fins have an 'elaborate nerve supply'. These fins are held up and out to the side of the body and are used to detect water movement and to trap and direct towards the mouth the small crustaceans on which it feeds.
Wallago attu is a freshwater catfish of the family Siluridae, native to South and Southeast Asia. According to Malaysian folklore, the descendant of a person called Tok Kaduk cannot eat and touch the fish because the legend says that a long time ago, Tok Kaduk caught this tapah. When he cut open its stomach, there was gold inside the fish so Tok Kaduk took the gold, stitched up the fish, and released it back into the river. From that time, if the descendant came in touch with the fish, their skin would become red and itchy until they went to Kg Tua, Lambor Kanan near Bota to find the medicine. The medicine is the remaining gold from the fish, which has been kept to make the cure for the disease.
Roosterfish are an in-shore game fish and the only species in its family and genus. It is notable for its 'rooster comb' that usually has seven to eight long spines as dorsal fins that remain at rest atop its back. When it gets excited – and to attract its prey – it raises at an unbelievable speed. The roosterfish has an unusual arrangement of its ears: the swim bladder penetrates the brain through the large foramina and makes contact with the inner ear. It uses its swim bladder to amplify sounds.
In 1961, the city of Savannah, Ga. tried to dye the river behind its City Hall green, however, the best it could do was create colored streaks in the water. The following year, Mayor Richard J. Daley — a politician of Irish-American descent who was raised in a heavily Irish neighborhood in Chicago — had been hoping to turn Lake Michigan green for the holiday. Lake Michigan green was a bit too much to ask, a group of Chicago plumbers identified the right formula for turning a city river the perfect shamrock shade, and a new holiday tradition was born. And finding the perfect shade was truly a happy accident as the plumbers union's business manager noticed bright green stains on another worker's coveralls while on a different job, according to Ilinois's tourism site. That first year, the Chicago Journeyman Plumbers Union dumped 100 pounds of dye into the river, turning it green for a solid week. Nowadays, the union uses about 40 pounds of vegetable-based powder dyes that are more environmentally friendly and turn the river green for just a few days. The hue can last for days, depending on the weather. Every year, thousands of people brave the early morning cold to catch a glimpse of boats dropping dye into the river before the city's parade begins its march through downtown
The gummy shark (Mustelus antarcticus), also known as the Australian smooth hound, flake, sweet william or smooth dog-shark, is a shark in the family Triakidae. These small to medium-sized bottom-dwelling sharks are found mostly in, but are not limited to, the area around the southern seas of Australia and is commonly baited and fished for cuisine because of its taste and market prices. Gummy Sharks are practically synonymous with "fish and chips" in southern Australia—and with good reason! Their flaky but firm meat is practically as sweet as the gummy shark candies named after them.
Scup can live a relatively long time, up to about 20 years, and are able to reproduce when they reach two years of age, when they're about 8 inches (20 cm) long. Individual scup spawn once a year, with females releasing an average of 7,000 eggs, which are fertilized externally. Their eggs and larvae are found in the water column in coastal waters during warmer months. As larvae mature, they settle to the seafloor and develop into juveniles. Scup migrate north and inshore to spawn in the spring, then migrate south and offshore in autumn as the water cools, arriving by December in offshore areas where they spend the winter.