The following constitute some of the most common freshwater fish found in Puerto Rico
American eel (Anguilla rostrata): Its color varies. It has pointy teeth in both jaws.
Redbreast sunfish (Lepomis auritus): Ventral and abdominal areas are yellow in juveniles and red in adults. The tip of the operculum is elongated and black.
Bluegill (Lepomis macrochirus): The operculum has a mole or black spot. It has a small mouth.
Redear sunfish (Lepomis microlophus): The operculum has a black mole; its tip is deep red in males and orange in females.
Largemouth bass (Micropterus salmoides): It has a large mouth in proportion to its body. The upper jaw bone extends to the eyes.
Butterfly peacock bass (Cichla ocellaris): Its body is similar to that of the largemouth bass but it is more compressed. It has a black mole on the caudal fin with a yellow tip and black stripes on its yellow body.
Mozambique tilapia (Tilapia mossambica): Dorsal fin is elongated and single. Its mouth is big and protruding.
Redbreast tilapia (Tilapia rendalli): Short and rounded snout. The head and body are cinnamon to dark brown with six stripes behind the head.
Threadfin shad (Dorosoma petenense): Small fish. Its head has a robust snout. It has big eyes in proportion to its body. Pectoral fins have a black mole on top. It serves as bait.
Rosy barb (Barbus conchonius): The caudal fin has a black spot in the middle. It has a single dorsal fin. It serves as bait.
Goldfish (Carassius auratus): It has large scales. It is yellow-orange in aquariums, but grayish in reservoirs. It serves as bait.
Fat sleeper (Dormitator maculatus): It has large scales. The lateral line has 30 scales. Dorsal and anal fins have dark spots, yellow, orange or red in males.
Spinycheek sleeper (Eleotris pisonis): The top of the head has an inter-orbital area that is slightly convex with a thorn directed downward and frontward and partially hidden in the pre-operculum angle.
Bigmouth sleeper (Gobiomorus dormitor): Its body is elongated, almost cylindrical on the front side, and compressed on the back. It has a large mouth with rows of teeth. The lower jaw is more projected than the upper jaw.
Sand fish (Awaous tajasica): Its snout is short and its lips are thick. Its head and torso have dark and wavy spots.
Sirajo goby (Sicydium plumieri): Juveniles are known as Ceti. Their bodies are transparent without scales. Adults have 80 rows of scales except in the head. Its mouth has rows of teeth.
Mountain mullet (Agonostomus monticola): Its body is moderately robust, and slightly compressed and elongated. It has thick, fleshy lips and its jaws have several rows of teeth.
White catfish (Ictalurus catus): It has eight barbels around its mouth; the tail is slightly forked. Its belly is white. Its body is dark gray or black.
Brown bullhead (Ictalurus nebulous): Its back is bluish or dark brown and mottled. It has eight barbels around its mouth. It has a truncated tail.
Channel catfish (Ictalurus punctatus): Its body is black or dark-colored with black spots on the body. It has eight barbels around its mouth. It has a forked tail.
Mosquito fish (Gambusia affinis): The dorsal fin originates about halfway on the anal fin. The head and torso are orange and olive-colored and the belly is white. The fins are transparent with black spots, especially on the tail. It is also known as Guppy. It serves as bait.
Swordtail (Xiphophorus helleri): It has a single dorsal fin. Adult males have a prominent extension in the lower lobe of the tail fin. It serves as bait.
Platy fish (Xiphophorus maculatus): Its body is short but deep; its mouth has pointy teeth in single rows. It serves as bait.
Prepared by: Jeanette Rivera
Natural Resource Technician
Contributed by: Wilhem Hernández
Natural Resource Specialist
Author: Grupo Editorial EPRL
Published: August 27, 2014.
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