Tetraodon Nigroviridis ( spotted green puffer ) Marion de Proce, 1822

*aka:  green spotted puffer, spotted puffer, common puffer.
Origin Cambodia, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam.
pH Range  8.0 - 8.5
Temp.   75 - 82F (24 - 28C)
Hardness  9- 19dh 
Salinity  freshwater to light brackish
Length  to 6 inches (15 cm) 
Diet  live, frozen

T. nigroviridis is a freshwater to light brackish species of pufferfish inhabiting rivers, lakes and flood plains.  Although largely carnivorous (mollusks, crustaceans, invertebrates) it will occasionally eat vegetation.  It is the epitome of aggressive puffers, and a notorious fin-nipper.
Reproductive pairs lay approximately 200 eggs on a smooth, sheltered surface and are known nest-guarders.  They are dioectic.
One of the more commonly sold puffers, it is often confused with t. fluviatilis, and t. schoutedeni.   In short, t. nigroviridis has a more club-like shape (almost balloonish) with a smooth belly than t. fluviatilis.  T. schoutedeni is easy to differentiate, as it has backward pointing spines along its underbelly.  Identifying these similar looking fish is important, since one is brackish and the others fresh.  You can view an in-depth differentiation in these species here.

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