Venoms from stingrays (Class Chondrichthyes: Myliobatiformes) and fish (Osteichthyes: Actinopterygii) for possible therapeutics.

The niquim Thalassophryne nattereri Steindachner, 1876 (Actinopterygii: Batrachoidiforme: Batrachoididae) It is a fish with calm habits and the venom is inoculated into the victim, usually, bathers and fishermen who step on the animal.Niquim is found throughout the Northeast region of Brazil, both in fresh and salt water.Accidents occur more frequently in rivers where this animal is present.Its appearance is almost identical to that of the pacamão, but it does not grow as much and its body is slightly reddish.lives mainly in brackish waters, common in regions where sea and river waters meet.It is approximately 15 centimeters long, is wider at the level of the pectoral fins, is thinner at the back, and does not have scales but is covered in mucus (Figure 1) [1-3].