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2. Reef aquarium - Wikipedia

   en.wikipedia.org/wiki/Reef_aquarium

   A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriately intense lighting, turbulent water movement, and more stable water chemistry than fish-only marine ...

3. Sensory systems in fish - Wikipedia

   en.wikipedia.org/wiki/Sensory_systems_in_fish

   The abilities of the electric fish to communicate and identify sex, age, and hierarchy within the species are also made possible through electric fields. EF gradients as low as 5nV/cm can be found in some saltwater weakly electric fish. [27] Several basal bony fishes, including the paddlefish (Polyodon spathula), possess electroreceptors.

4. Saltwater fish - Wikipedia

   en.wikipedia.org/wiki/Saltwater_fish

   Saltwater fish. Saltwater fish, also called marine fish or sea fish, are fish that live in seawater. Saltwater fish can swim and live alone or in a large group called a school. [1] Saltwater fish are very commonly kept in aquariums for entertainment. Many saltwater fish are also caught to be eaten, [2][3] or grown in aquaculture.

5. 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]

6. Marine aquarium - Wikipedia

   en.wikipedia.org/wiki/Marine_aquarium

   A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only ( FO ), fish only with live rock ( FOWLR ), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical ...

7. 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.