Queen Conch
Queen Conch
Aliger gigas
Protected Status
Quick Facts
About the Species
The queen conch is a large gastropod (snail) in phylum Mollusca. Queen conch are slow growing and late to mature, reaching up to 12 inches in length and living up to 30 years. The queen conch occurs throughout the Caribbean Sea, the Gulf of Mexico, and around Bermuda. They are benthic-grazing herbivores that feed on diatoms, seagrass detritus, and various types of algae and epiphytes. Adult queen conch prefer sandy algal flats, but are also found on gravel, coral rubble, smooth hard coral, and beach rock bottom, while juveniles are primarily associated with seagrass beds.
Queen conch are highly sought after for their meat and are one of the most valuable species in the Caribbean. Learn more about their current fishing/harvest status.
In 2024, NOAA Fisheries listed the queen conch as threatened under the Endangered Species Act.
Appearance
- Queen conch have long eye stalks that can be moved independently and a tube-like mouth called a proboscis that can pull into its shell if threatened.
- Queen conch are characterized by a large, heavy, whorl-shaped shell with multiple short spines at the apex, a brown and horny operculum, and a pink interior of the shell lip.
- They can grow up to 12 inches and weigh up to 5 pounds. Females on average grow more quickly than males, to a larger size, and have greater weight than males.
Biology
- Queen conch is a long lived species, generally reaching 25 to 30 years old, and are believed to reach sexual maturity around 3.5 to 4 years of age. They have determinate growth and reach maximum shell length before sexual maturation; thereafter the shell grows only in thickness. Size at maturity can vary depending on environmental conditions.
- Queen conch have a protracted spawning season of 4 to 9 months, with peak spawning during warmer months. They reproduce through internal fertilization, meaning individuals must be in contact to mate.
- Females can store fertilized eggs for several weeks, and eggs may be fertilized by multiple males. Egg laying takes 24 to 36 hours, with each egg mass containing about 750,000 eggs. After an incubation period of about 5 days the eggs hatch, and the veligers (larvae) drift in the water column from 21 to 30 days before settling to the bottom and metamorphosing into the adult form.
- Queen conch are slow moving marine snails that require direct contact to mate and these life history traits make them vulnerable to depensatory processes which impact reproductive success and impedes recovery of depleted populations.
- Larval conch feed on phytoplankton, juvenile conch feed primarily on seagrass detritus macroalgae and organic material in the sediment, and adults feed primarily on different types of filamentous algae.
Where They Live
Range
- Queen conch occurs throughout the Caribbean Sea, in the Florida Keys, and the Gulf of Mexico, and around Bermuda.
Habitat
- Queen conch use different habitat types including seagrass beds, sand flats, algal beds, and rubble areas from a few centimeters deep to approximately 30 meters.
- Adult distributions are heavily influenced by food availability and fishing pressure; in unexploited areas, they are most common in shallow marine waters less than 30 meters depth.
Scientific Classification
- Queen conch occurs throughout the Caribbean Sea, in the Florida Keys, and the Gulf of Mexico, and around Bermuda.
- Queen conch use different habitat types including seagrass beds, sand flats, algal beds, and rubble areas from a few centimeters deep to approximately 30 meters.
- Adult distributions are heavily influenced by food availability and fishing pressure; in unexploited areas, they are most common in shallow marine waters less than 30 meters depth.
Scientific Classification
Kingdom | Animalia | Phylum | Mollusca | Class | Gastropoda | Order | Littorinimorpha | Family | Strombidae | Genus | Aliger | Species | gigas |
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Featured News
Seafood Facts
Is Queen Conch Sustainable?
U.S. wild-caught queen conch is a smart seafood choice because it is sustainably managed under a rebuilding plan that allows limited harvest by U.S. fishermen.
Availability
Year-round.
Source
U.S. wild-caught from Puerto Rico and the U.S. Virgin Islands, but U.S. harvest is very limited.
Taste
Conch has a sweet, slightly smoky flavor, similar to abalone or clam, and an almost crunchy texture. Fresh, farmed conch is sweeter and more tender than frozen, wild conch.
Texture
Young “thin-lipped” conchs have more tender meat than larger, “thick-lipped” ones.
Color
Depending on the conch’s size, the meat ranges in color from snow white to a pale, golden orange. The larger the animal, the darker the meat.
Health Benefits
Queen conch is a good low-fat source of protein. It is high in vitamins E and B12, magnesium, selenium, and folate, but is also high in cholesterol.
Nutrition Facts
Servings: 1; Serving Weight: 100 g; Calories: 130; Protein: 26.3 g; Total Fat: 1.2 g; Total Saturated Fatty Acids: 0.37 g; Carbohydrate: 1.7 g; Total Sugars: 0 g; Total Dietary Fiber: 0 g; Cholesterol: 65 mg; Selenium: 40.3 mcg; Sodium: 153 mgMore Information
Seafood News
Fishery Management
Queen conch may not be commercially or recreationally harvested in Florida waters per state law. In the Caribbean, NOAA Fisheries and the Caribbean Fishery Management Council manage queen conch in federal waters, while the governments of Puerto Rico and the U.S. Virgin Islands manage queen conch in their territorial waters.
Population
The stock is overfished, but the fishing rate established under a rebuilding plan promotes population growth.
Fishing Rate
Not subject to overfishing.
Habitat Impacts
Primarily harvested by hand, so there is little impact on habitat.
Bycatch
Primarily harvested by hand, so the fishery is very selective and there is little, if any, bycatch.
Population Status
- According to the 2009 stock assessment (PDF, 195 pages), queen conch is overfished but is not subject to overfishing based on 2021 catch data.
Fishery Management
- NOAA Fisheries and the Caribbean Fishery Management Council manage queen conch in federal waters. The governments of Puerto Rico and the U.S. Virgin Islands manage queen conch in their territorial waters.
- Managed under the Fishery Management Plan for Queen Conch Resources of Puerto Rico and the U.S. Virgin Islands in federal waters, and under Puerto Rico and U.S. Virgin Islands regulations in territorial waters:
- Harvest of queen conch is prohibited in federal waters off Puerto Rico and St. Thomas and St. John.
- Harvest of queen conch is allowed in federal waters around St. Croix east of 64°34′ W longitude during the open fishing season (November through May).
- Seasonal and area closures protect juvenile and spawning conch.
- Annual catch limits are applicable to federal waters.
- Daily commercial trip limits, recreational bag limits, and minimum size limits apply to queen conch harvest in both federal (where harvest is allowed) and territorial waters.
- Annual quotas apply for harvest of queen conch in territorial waters of the U.S. Virgin Islands.
- Requirements to keep queen conch attached to the shell in federal waters and when landed in the U.S. Virgin Islands allow for effective counting by enforcement agents.
- A rebuilding plan to rebuild the stock to the target population level is in place with a target date of 2020.
- The International Queen Conch Initiative was established by resource managers from Caribbean countries to coordinate international management of queen conch in the region.
Harvest
- The United States is a major importer of queen conch, due to the limited harvest allowed in federal waters and U.S. Virgin Islands territorial waters.
- Commercial landings of queen conch meat from Puerto Rico and St. Thomas/St. John (territorial waters) and St. Croix (federal and territorial waters) in 2021 was 31,000 pounds and were valued at $200,000 according to the NOAA Fisheries commercial fishing landings database.
- Queen conch are primarily caught by hand, so there is minimal impact on habitat and little bycatch.
- The queen conch fishery has a long tradition in the Caribbean region. The meat is sold either fresh or dried and the shells are used in pottery and jewelry.
ESA Conservation & Management
Management Overview
The queen conch is listed as threatened under the Endangered Species Act (ESA).
In addition, queen conch is listed under Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) and under Annex III of the Protocol for Specially Protected Areas and Wildlife (SPAW).
Status
ESA Threatened
- Throughout Its Range
CITES Appendix II
- Throughout Its Range
SPAW Annex III
- Throughout the Wider Caribbean Region
Threats
Overutilization
The primary threat to queen conch is overutilization through commercial and illegal fishing. Despite a multitude of fisheries management measures enacted across the region, populations are depleted. The depleted densities of remaining queen conch populations limit mate finding, reproduction, recruitment, and population connectivity.
Inadequacy of existing regulatory mechanisms
Existing regulatory mechanisms including morphometric and exploitation thresholds, compliance, and enforcement are insufficient to protect the species from growth overfishing and poaching, including illegal, unreported, and unregulated fishing, throughout the Caribbean.
Conservation Efforts
In November 1992, queen conch was included in Appendix II of CITES. After extensive reviews of scientific and management information, CITES proposed a range of actions in the mid-1990s and again in 2003-05 to improve the sustainability and legality of the trade. In the United States, the U.S. Fish and Wildlife Service is the government agency designated under the ESA to carry out the provisions of CITES. NOAA Fisheries provides guidance and scientific support on marine issues given our technical expertise.
In recognition of the overutilization of the species, the Western Central Atlantic Fishery Commission (WECAFC) formed a queen conch working group at their 14th session, in 2012. The working group focuses on strengthening national, regional, and international efforts towards queen conch conservation, while also promoting the fishing communities that depend on them, through the adoption and implementation of the Regional Queen Conch Fisheries Management and Conservation Plan. The WECAFC working group has regular meetings to promote conservation strategies and international commitments to conservation efforts.
Innovative strategies continue to be proposed to enhance queen conch conservation. Through aquaculture, queen conch can be harvested without removing individuals from the wild. Farmed queen conch could potentially be used in the future to restock wild populations. Several small-scale queen conch aquaculture programs exist throughout the Caribbean, primarily sponsored by the Queen Conch Lab at Florida Atlantic University Harbor Branch Oceanographic Institute. One of these projects is run at the Naguabo Aquaculture Center which has a queen conch hatchery and nursery for restoration as well as an aquaponic system that is used to grow sea vegetables for culinary dishes and coastal restoration. This Aquaculture Center serves as a demonstration and training facility for Puerto Rico and other Caribbean countries. It is supported with grants from Saltonstall-Kennedy NOAA Fisheries, USDA Agricultural Research Service, and Puerto Rico Sea Grant.
Key Actions and Documents
Documents
Endangered Species Act Status Review Report for Queen Conch
This is the status review report for queen conch under the Endangered Species Act (ESA). This…
Research
Questions and Answers on the Queen Conch Final Rule Spanish Translation
Preguntas y Respuestas
Exploitation Drives Changes in the Population Connectivity of Queen Conch (Aliger gigas)
We assessed how the population connectivity of conch changes with spatially variable patterns of…
Historical Annual Catch Limit Monitoring under the Queen Conch Fishery Management Plan
The preliminary annual landings in the table below correspond to the queen conch ACL set under the 2010 ACL Amendment to the Caribbean Fishery Management Council’s Queen Conch Fishery Management Plan, which was effective 1996 - 2022.