All Fresh Water Fish

Tetraodon nigroviridis

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Tetraodon nigroviridis is one of the pufferfish known as the green spotted puffer (the other being Tetraodon fluviatilis).[1] It is found across South and Southeast Asia in coastal freshwater and brackish water habitats.[2] Tetraodon nigroviridis reaches a maximum length of about 15 cm (5.9 in).[3]

Adult Tetraodon nigroviridis are found in freshwater streams, rivers, and flood plains; young are found in brackish water.[4] It is also found in mangrove forests.[2] This is however disputed and the exact habitat of this fish is not yet fully known.[citation needed] Diet consists primarily of snails, but includes small invertebrates such as mollusks, crustaceans, and some plant material.[5] This species may also be lepidophagous.[5]

Tetraodon nigroviridis has the smallest known vertebrate genome, roughly 340 million base pairs[6], and has thus been selected as a model organism for genetics. In 2004 a draft of its genome sequence was published.[6]

Tetraodon nigroviridis is by no means a food fish, but has some value as bait and is very widely traded as an aquarium fish,[5] and is sometimes mistaken as the Ceylon Puffer, or Tetraodon fluviatilis. Tetraodon nigroviridis also has some degree of value as a lab animal, in particular in the field of genetics, because it has the same number of genes as human beings but in a genome about one-tenth the size.[7]

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