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Aurelia aurita (also called the common jellyfish, moon jellyfish, moon jelly or saucer jelly) is a species of the family Ulmaridae. [1] [2] All species in the genus are very similar, and it is difficult to identify Aurelia medusae without genetic sampling; [3] most of what follows applies equally to all species of the genus.
Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological family Characidae and to its former subfamilies Alestidae (the "African tetras") and Lebiasinidae. The Characidae are distinguished from other fish by the presence of a small adipose fin ...
At the top, an empty circle depicts the absolute . According to Zhou, wuji is also a synonym for taiji. [9] A second circle represents the Taiji as harboring Dualism, yin and yang, represented by filling the circle in a black-and-white pattern. In some diagrams, there is a smaller empty circle at the center of this, representing Emptiness as ...
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]
Description. The slippery dick wrasse is a small fish that can reach a maximum length of 35 cm (14 in). [2] It has a thin, elongate body with a terminal mouth, and its body coloration has three phases during its life: The terminal phase is when the fish becomes a male, so the body coloration turns to green with two longitudinal dark stripes.
Pristella maxillaris is a small, adaptable fish that is often kept in a home aquarium and will eat most fish foods. It is tolerant of a range of water chemistry values (pH 6–8; hardness up to 20 dGH). As a shoaling species, it is usually kept in groups of at least six specimens and away from aggressive or predatory tankmates, but is otherwise ...
External anatomy of a bony fish (Hector's lanternfish): 1. operculum (gill cover), 2. lateral line, 3. dorsal fin, 4. adipose fin, 5. caudal peduncle, 6. caudal fin, 7. anal fin, 8. photophores, 9. pelvic fins (paired), 10. pectoral fins (paired) Internal anatomy of a bony fish. Fish anatomy is the study of the form or morphology of fish. It ...
Underwater camouflage. Underwater camouflage is the set of methods of achieving crypsis —avoidance of observation—that allows otherwise visible aquatic organisms to remain unnoticed by other organisms such as predators or prey. Camouflage in large bodies of water differs markedly from camouflage on land. The environment is essentially the ...
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