Which of the following deep-sea fish has a pelican-like mouth and is called a "pelican eel!"
Lantern fish
Widethroat fish
Correct Answer: Widethroat fish
Answer Analysis:
Among the deep-sea fish, there is a fish with a pelican-like mouth that is called "widethroat fish". Widethroat fish is a deep-sea fish found mainly in the deep-sea areas of the Atlantic, Pacific, and Indian Oceans, and usually lives in deep-sea environments below 1,000 meters underwater.
The most striking feature of widethroat fish is their large mouths. Their mouths can be opened to a very large size, almost half the length of their body. This unique large-mouth structure allows them to easily catch larger prey such as other fish, crustaceans, etc. The teeth of the broadthroat fish are small and sharp, arranged in a comb-like pattern, making it easy to catch slippery prey.
In addition to largemouths, widethroat fish have other special characteristics that are adapted to deep-sea life. They have an elongated body with a large head and an elongated tail. Due to the extremely weak light in the deep-sea environment, the eyes of the widethroat fish have little degeneration and have little visual function. But their well-developed lateral line system helps them detect their surroundings and the movements of their prey in the dark depths of the ocean.
Widethroat fish are typically black or dark brown in color, and some species also emit biofluorescence. These traits help them to conceal themselves in the deep sea and avoid being detected by predators.
Widethroat fish are an important link in the deep-sea food chain, feeding on other small fish and invertebrates, as well as prey for some large deep-sea fish. Due to living in the extreme environment of the deep sea, there are still many unsolved mysteries about the ecological habits and reproductive behaviors of widethroat fish, which need further research and exploration by scientists.