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A seahorse (also written sea-horse and sea horse) is any of 46 species of small marine bony fish in the genus Hippocampus.The genus name comes from the Ancient Greek hippókampos (ἱππόκαμπος), itself from híppos (ἵππος) meaning "horse" and kámpos (κάμπος) meaning "sea monster" [4] [5] or "sea animal". [6]
The dwarf seahorse only reaches up to 2 inches (51 mm) in length and is not an aggressive feeder. Therefore, it is typically kept in small aquariums (5 to 10 US gallons (19 to 38 L)). The dwarf seahorse can be fed brine shrimp nauplii, although it will also eat copepods and other shrimp larvae. Because of its short digestive tract, food must be ...
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In species where males take on more of the reproductive costs, such as sea horses and jacanas, the role is reversed, and the females are larger, more aggressive and more brightly coloured than the males. In hermaphroditic animals, the costs of parental care can be evenly distributed between the sexes, e.g. earthworms.
Males have two common yet very aggressive courtship behaviours. The first is snapping, a male will aim and flick his snout at his opposing male in order to propel him away. If the male is successful the opposing seahorse will darken and flatten into a submissive position signalling that he has given up. The second behaviour is wrestling.
The lined seahorse is a diurnal species that ranges in length from 12 cm to 17 cm; the maximum length reported for the species is 19 cm. The seahorse is sexually dimorphic, meaning there are distinct differences in appearances of males and females; most notably the brood pouch located on the male's abdomen which it utilized in reproduction.
Pygmy seahorses have a single gill opening on the back of the head (instead of two on the sides as in normal seahorses), and the males brood their young inside their trunk, instead of in a pouch on the tail. [11] A molecular phylogeny confirms that the pygmy seahorses are a monophyletic sister lineage of all other seahorses. [10]
A medium-sized seahorse, the tiger tail seahorse reaches a maximum total length of around 15 centimetres (5.9 in). [5] The coloration of this species is variable, generally being black or brown in adults with yellow saddle shapes on the upper surface and yellow stripes on the tail, hence the common name.