Fun fact: some say that the nurse shark gets its name from the way it gently sucks food from the bottom of the ocean, reminding one of a baby suckling.
The nurse shark (Ginglymostoma cirratum) is an elasmobranch fish in the family Ginglymostomatidae
They inhabit warm, shallow waters across the Atlantic and Eastern Pacific oceans
Fun fact:
They are weakly electric fish. They generate a constant, low-voltage electric field from an organ in their tail
By sensing how objects and prey disrupt this field (a process called electrolocation), they can navigate in total darkness and muddy riverbeds.
The black ghost knifefish is a tropical ornamental fish belonging to the ghost knifefish family the ghost knifefish family
They originate in freshwater habitats in South America where they range from Venezuela to the Paraguay–Paraná River, including the Amazon Basin
The green swordtail fish is a species of freshwater/brackish fish in family Poeciliidae of order Cyprinodontiformes
Only male green swordtail fish grow the "sword", it is used for courtship as females strongly prefer males with longer "swords"
flashlight fishes ( Anomalopidae ) are a family of fish distinguished by bioluminescent organs located underneath their eyes, given their name
These light organs contain luminous bacteria and can be "shut off" by the fish using either a dark lid or by being drawn into a pouch