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2. Anomalopidae - Wikipedia

   en.wikipedia.org/wiki/Anomalopidae

   Flashlight fish are found in tropical ocean waters across the world. [3] They are typically about 14 cm (5.5 in) in size, although some species can reach twice this length. They are nocturnal, feeding at night on small crustaceans. Some species move to shallow waters near coral reefs at night, but otherwise, they are exclusively deep water fish ...

3. Photoblepharon palpebratum - Wikipedia

   en.wikipedia.org/wiki/Photoblepharon_palpebratum

   Photoblepharon palpebratum in the dark. The eyelight fish is a small, dark fish, with a relatively stout body for an anomalopid. It has a blunt snout, large eyes, and prominent subocular light organs. It has a single dorsal fin and no adipose fins. It has 2–3 dorsal spines, 16–20 dorsal rays, 2 anal spines, and 13–15 anal soft rays.

4. Diel vertical migration - Wikipedia

   en.wikipedia.org/wiki/Diel_vertical_migration

   Diel vertical migration (DVM), also known as diurnal vertical migration, is a pattern of movement used by some organisms, such as copepods, living in the ocean and in lakes. The adjective "diel" (IPA: / ˈdaɪ.əl /, / ˈdiː.əl /) comes from Latin: diēs, lit. 'day', and refers to a 24-hour period. The migration occurs when organisms move up ...

5. Sleep in fish - Wikipedia

   en.wikipedia.org/wiki/Sleep_in_fish

   Sleep in fish. Sleep can be defined in birds and mammals by eye closure and typical electrical patterns in the neocortex, but fish lack eyelids and a neocortex. Yet this oscar is behaviorally quiescent at night, lying unresponsive on the bottom with its eyes turned downward, and might be said to sleep. [1]

6. Vision in fish - Wikipedia

   en.wikipedia.org/wiki/Vision_in_fish

   Fish retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some are sensitive to polarised light. Among jawless fishes, the lamprey [1] has well-developed eyes, while the hagfish has only primitive eyespots. [2]

7. Gigging - Wikipedia

   en.wikipedia.org/wiki/Gigging

   Gigging. A successful gigger in the Amazon basin, Peru. Gigging is the practice of hunting fish or small game with a gig or similar multi-pronged spear. Commonly harvested wildlife include freshwater suckers, saltwater flounder, and small game, such as frogs. A gig can refer to any long pole which has been tipped with a multi-pronged spear.