Lagodon is a monospecific genus of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. The only species in the genus is Lagodon rhomboides, the pinfish, red porgy, bream, pin perch, sand perch, butterfish or sailor's choice. This fish is found in the Western Atlantic Ocean and Gulf of Mexico.
Lagodon combines lagus, meaning "hare" or "rabbit", with odon, which means "tooth", this is thought to be a reference to the 8 wide, deeply notched incisor-like teeth at the front of each jaw. The specific name rhomboides means "in the form of a rhombus", presumed to be a reference to the shape of the scales in the illustartion of two seabreams called Perca marina rhomboidalis fasciata drawn by Mark Catesby published in 1754.
Lagodon has a moderately deep and compressed oval-shaped body with a small mouth and moderately large eyes. The dorsal profile of the head is steep and leads to a sharp snout. The teeth in the front of the mouth are small and incisor-like and point outwards. There are 12 dorsal fin spines, the first spine s=is small and points forward and gives this fish its common name of pinfish, and 10 dorsal fin rays. The anal fin has 3 spines and 11 soft rays. This species has an olive back, shading to bluish-silver on the flanks marked with slender yellow and blue horizontal stripes and 5 or 6 dark, poorly defined, vertical bars also on the flank. The fins are pale yellow with wide, pale blue edges. There is an obvious black spot on the shoulder, to the rear of the operculum. The pinfish has a maximum published total length of 40 cm (16 in), although 18 cm (7.1 in) is more typical, and a maximum published weight of 1.5 kg (3.3 lb).
Lagodon is found in Bermuda and along the United States coast from Massachusetts to Texas, and down along the Mexican Gulf Coast. It is also found along the northern Yucatán coast and near some northern Caribbean islands, but it is less common in the tropical portions of its range. The adult pinfish prefers waters between 30 and 50 feet deep, while the juvenile is more common where there is some cover, such as seagrass beds, rocky bottoms, jetties, pilings, and mangroves. It prefers higher-salinity water. It rarely schools, but it associates with other individuals, especially where food items such as barnacles are abundant.
Lagodon undergoes ontogenetic changes in the morphology of their dentition and gut tracts which affect diet throughout their life history. Juvenile pinfish are carnivorous and primarily eat shrimp, fish eggs, insect larvae, polychaete worms, and amphipods. As pinfish become older and larger they become increasingly more herbivorous, with plant matter comprising >90% of the diet for pinfish greater than 100mm.
Lagodon reaches sexual maturity at about one year, when the fish is 80 to 100 mm in length. Spawning season is in the fall and winter. Eggs are broadcast in the water by the female, then fertilized by the male. The number of eggs varies from 7,000 to 90,000. They hatch after about 48 hours. Larvae are not protected by adults. The larval stage ends when the fish is about 12 mm in length, and the juvenile reaches maturity when it is about 80 mm. Because this species is eaten by many other animals, its life span is generally short.
