How Big Do Monkfish Get? Average and Record Sizes

Monkfish are deep-sea creatures recognized for their distinctive appearance and their meat, which is often sought after in culinary circles. These unique fish, also known as anglerfish or goosefish, inhabit the ocean floor and employ an ambush hunting strategy. Their size can vary significantly, depending on several biological and environmental factors.

Common Monkfish Dimensions

Monkfish exhibit a broad, flattened head with a very large mouth, contributing to their unique silhouette. The typical length for adult monkfish ranges from 2 to 4 feet, with many commercially caught specimens falling within this range. Their weight commonly reaches around 50 pounds. Female monkfish generally grow larger and live longer than males; females can exceed four feet in length and live to at least 13 years, while males typically grow up to three feet and live for about seven years. Their body shape, which is wide and not very tall, contributes to their flat appearance.

What Determines Monkfish Size

Several factors influence the overall size a monkfish can achieve. Different species of monkfish possess varying genetic potentials for growth; for instance, species in more temperate areas, such as the blackfin goosefish, are smaller, reaching maximum sizes of approximately two feet. Age plays a significant role, as monkfish exhibit terminal growth, meaning they continue to grow throughout their entire lives. Older individuals, particularly females, tend to be larger.

Diet also impacts growth rates, as monkfish are opportunistic feeders with a varied diet that includes small fish, crustaceans, and mollusks. The availability of abundant prey allows for more robust growth. Their habitat, including water temperature, depth, and prey availability in specific ocean regions, further influences their size. Monkfish can tolerate a wide range of temperatures and depths, from inshore waters to nearly 3,000 feet, which allows them to adapt to different feeding grounds.

Largest Recorded Monkfish

The largest species, Lophius piscatorius, has been reported to reach up to 78.7 inches (200 cm) and weigh as much as 127 pounds (57.7 kg). One of the biggest monkfish ever recorded was caught off the coast of Norway in January 2012, weighing approximately 250 pounds (18 stone). Another notable specimen, a female, was caught off Ireland in 2010, measuring 1.86 meters (six feet) and weighing 68 kg (nine stone) live weight, setting a new Irish and British record at the time. Icelandic waters have also yielded large monkfish, with one caught in 2012 measuring 126 centimeters long and weighing 26 kilograms, though the largest caught there measured 155 centimeters.