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Sailfin groupers have a small range in the tropical Eastern Pacific, restricted to the Galapagos Islands, Cocos Island, and Malpelo Island. Although, the majority of the population is concentrated within the Galapagos archipelago. These groupers are top reef predators in their habitat and have a wide depth range, from near the surface around 600 ft (180 m). They are typically found among rocky reefs, vertical rock walls, drop-offs, and underwater lava ridges. Juvenile sailfin groupers utilize shallow-water habitats such as lagoons, seagrass beds, and lava ponds. The long body of adults is normally pale gray-brown in color with
numerous, closely set brown spots. They sometimes have 10 to 12 thin, dark bars. Occasionally they are entirely bright yellow in color. Adults mainly feed on fish with large adults primarily feeding on Pacific creolefish (Paranthias colonus). Sailfin groupers are thought to be protogynous hermaphrodites, meaning they mature as females and some later change sex to become males. Females reach sexual maturity at an estimated average of 6.5 years of age. (The size and age at which females transition to males is estimated to be around 2.7 ft (83.7 cm) and 15.2 years of age.)
The species has an annual reproductive cycle. Spawning takes place in aggregations. These groupers can live at least 21 years and grow to about 47 inches (120 cm) long. The sailfin grouper is a species of high cultural and economic importance to the Galapagos Islands. Dried sailfin groupers are used for a traditional soup that is consumed during Easter. Sailfin groupers have been targeted by artisanal hand-line fishers since the 1920s. They are currently listed as endangered. Their already skewed sex ratio is severely amplified by fishing practices that target spawning aggregations and disproportionately remove large individuals,
which are predominantly male. The removal of these large males can lead to a condition known as "sperm limitation," where there are too few males to effectively fertilize the eggs of the numerous females, thereby hindering population growth. This combination of slow growth, late maturity, and a fragile reproductive system in this species means that even low levels of exploitation can cause significant population declines. For more marine facts, click the SUBSCRIBE button!
