Trystan Casey
The lesser electric ray, a small fish that lives in the western coastal fringes of the Atlantic Ocean and the Caribbean Sea, has been the subject of controversy regarding its conservation status. While some studies and organisations have suggested that the species is not facing immediate threats, others have classified it as critically endangered, leading to debates and petitions for its inclusion under the Endangered Species Act in the United States. The discrepancy in conclusions arises from differences in data interpretation, with some arguing that the perceived decline in population may be due to changes in sampling methodologies rather than a true decrease in numbers. The unique ability of the lesser electric ray to generate electric charges for stunning prey and self-defence makes it an intriguing species, and its conservation status remains a topic of ongoing discussion and re-evaluation.
| Characteristics | Values |
|---|---|
| Common Name | Lesser Electric Ray |
| Scientific Name | Narcine Bancroftii |
| Habitat | Western coastal fringes of the Atlantic Ocean and Caribbean Sea |
| Population Status | No consensus; some studies suggest it is not facing immediate threats, while others classify it as critically endangered |
| Conservation Status | The International Union for Conservation of Nature (IUCN) rates it as "least concern". However, there have been petitions to list it as threatened or endangered under the Endangered Species Act (ESA) in the US |
| Population Trends | There is conflicting evidence; a 2005 paper reported a 98% decline in abundance, but a 2017 paper found no evidence of a decline and attributed the perceived decline to changes in sampling methods |
| Life Span | Approximately 15 years |
| Diet | Fish, crustaceans, annelids, worms, snake eels, and sea anemones |
| Behavior | Nocturnal, sluggish swimmer, remains motionless during the day and forages for food at night |
| Reproduction | Ovoviviparous, with females giving birth to live young after a gestation period of around three months |
| Size | 30-45 centimeters long and 20 centimeters wide |
| Electric Discharge | 14-37 volts, enough to deliver a small shock to humans |
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What You'll Learn
Conservation status
The conservation status of the lesser electric ray has been a subject of debate. While some studies and scientists suggest that the species is not facing immediate threats, others have classified it as critically endangered.
In 2010, WildEarth Guardians petitioned the National Marine Fisheries Service (NMFS) to list the lesser electric ray as threatened or endangered throughout its historic and current range and to designate critical habitat within the United States under the Endangered Species Act (ESA). The NMFS initially found that the petition did not present substantial scientific or commercial information to support the requested action. However, after receiving a supplemental petition in 2013, the NMFS published a 90-day finding in 2014, initiating a status review of the species.
A 2005 paper reported a 98% decline in the population of lesser electric rays, attributing this decline to shrimp trawling bycatch. This led to the species being classified as Critically Endangered on the IUCN Red List, indicating the highest risk of extinction. However, a subsequent analysis by Dr. John Carlson of the NOAA Fisheries Service published in 2017 refuted the decline, stating that there was no evidence of a decline in the relative abundance of lesser electric rays. Dr. Carlson attributed the discrepancy in the data to changes in the trawl survey design, which reduced the probability of sampling in areas suitable for lesser electric rays.
The International Union for Conservation of Nature (IUCN) has rated the lesser electric ray as being of "least concern," and a similar conclusion was reached by the NOAA Fisheries Service in their review. The IUCN's assessment is based on a variety of sources and data relative to the abundance of the species, including trawl surveys conducted since 1972.
While the lesser electric ray may not be facing immediate threats of extinction, it is important to continue monitoring its population and habitat to ensure its long-term conservation.
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Population decline
The lesser electric ray (Narcine bancroftii) is a species of numbfish in the family Narcinidae. They are found on the western coastal fringes of the Atlantic Ocean and the Caribbean Sea. They are commonly found in the intertidal shallow waters under sand or mud, and have been found at depths of up to 180 feet (55m).
The lesser electric ray is a small, slow-moving fish, with a near-circular body and a short tail. They are easily caught as bycatch by shrimp fisheries and seine netters. This has led to concerns about their population status, with some classifications listing them as critically endangered.
In 2010, the National Marine Fisheries Service (NMFS) received a petition from WildEarth Guardians to list the lesser electric ray as threatened or endangered throughout its historic and current range and to designate critical habitat within the United States. This petition was based on a reported 98% decline in abundance based on analyses of a long-term, fisheries-independent trawl survey conducted in the northern Gulf of Mexico since 1972. This survey reported a drastic reduction in the number of lesser electric rays caught, which was attributed to shrimp trawling bycatch.
However, some researchers have questioned the methodology of this survey, pointing out that major changes in the trawl survey design may have impacted the results. They argue that the decrease in sampling intensity within the central Gulf of Mexico reduced the probability of sampling in areas of suitable habitat for lesser electric rays, leading to an underestimation of their population.
Subsequent investigations and analyses have found no evidence of a decline in the relative abundance of lesser electric rays, with trends in abundance being relatively flat. These studies emphasize the need for accurate and comprehensive data when considering the conservation status of a species to ensure that resources are applied to the recovery of truly endangered species.
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Habitat loss
The lesser electric ray (Narcine bancroftii), also known as the Brazilian electric ray, is a species of numbfish in the family Narcinidae. They are found in the western coastal fringes of the Atlantic Ocean and the Caribbean Sea, from North Carolina to Brazil. They are small slow-moving fish, living in the surf zone of sandy or muddy beaches. They are often found under sand or mud in intertidal shallow waters, up to a depth of 180 feet (55 m).
The lesser electric ray exhibits a patchy distribution over its range and is fairly abundant in specific habitats while consistently absent from others. They are known to be sluggish swimmers and maintain a territory in the surf zone of the beach.
The International Union for Conservation of Nature (IUCN) has rated the lesser electric ray as being of "least concern". However, some studies and classifications list the species as critically endangered, with a reported 98% decline in abundance based on analyses of a long-term, fisheries-independent trawl survey conducted in the northern Gulf of Mexico since 1972. This discrepancy in population status assessments can be attributed to changes in survey design and sampling frequency in the habitats preferred by the lesser electric rays.
The population of lesser electric rays in the Gulf of Mexico has decreased significantly, with similar declines observed in other regions. They are easily caught as bycatch by shrimp fisheries and seine netters due to their habitat and slow-moving nature. This highlights the potential impact of human activities on their habitat and the need for accurate data and conservation efforts to ensure the recovery of the species.
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Shrimp trawling bycatch
The lesser electric ray (Narcine bancroftii), also known as the Brazilian electric ray or spotted torpedo ray, is found in the western coastal fringes of the Atlantic Ocean and the Caribbean Sea. Its distinctive kidney-shaped body can grow to approximately 45 centimetres (18 inches) long and 20 centimetres (8 inches) wide. This species is known for its ability to generate electric charges, ranging from 14 to 37 volts, which it uses to stun prey and defend itself against predators.
In 2010, a petition was submitted by WildEarth Guardians to the National Marine Fisheries Service (NMFS) to list the lesser electric ray as threatened or endangered and to designate critical habitat within the United States. This petition was based on concerns about the species' population status and the potential impact of shrimp trawling bycatch. Initially, the NMFS did not find sufficient scientific or commercial evidence to support the petition, but a supplemental petition in 2013 led to a 90-day finding that the species may indeed be warranted for protection.
The discrepancy in conclusions highlights the complex nature of conservation assessments and the importance of accurate data. The 2005 paper that reported a 98% decline in the lesser electric ray population attributed this decrease to shrimp trawling bycatch, resulting in the species being classified as Critically Endangered on the IUCN Red List. However, subsequent analyses suggested that changes in survey design and sampling frequency, rather than a true population decline, may have contributed to the perceived decrease observed in the 2005 paper.
While the impact of shrimp trawling bycatch on the lesser electric ray is a cause for concern, it is important to consider all available data and information to ensure that conservation efforts are directed towards species that are truly in peril. As of 2025, the International Union for Conservation of Nature (IUCN) has rated the lesser electric ray as being of "least concern", indicating that the species may not be facing immediate threats to its survival. However, some scientists and conservationists continue to advocate for a re-evaluation of the species' status, highlighting the need for ongoing monitoring and research to ensure the long-term survival of this unique marine species.
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Predation by sharks
The lesser electric ray (Narcine bancroftii) is a unique species of fish known for its ability to generate electric charges, ranging from 14 to 37 volts. This electric ray species is found in the western coastal fringes of the Atlantic Ocean and the Caribbean Sea, typically in inshore waters up to 120 feet deep. While some studies suggest that the lesser electric ray is not facing immediate threats, its population status remains a subject of concern, with some classifications listing it as critically endangered.
The lesser electric ray is preyed upon by sharks and other large fish. Its slow-moving nature and preference for shallow waters make it an easy target for predators. The electric ray's ability to produce electric charges can be used for self-defense against sharks, but it may not always be effective, especially if the shark is larger or more agile.
The lesser electric ray's kidney-shaped body and short tail may also hinder its ability to escape from sharks. Its small size, ranging from 1 to 1.5 feet in length, makes it an easy target for larger sharks. The ray's sluggish swimming abilities further increase its vulnerability to shark attacks.
The electric ray's preferred habitat may also contribute to its vulnerability to shark predation. Its tendency to reside in shallow waters, often hiding in sand or mud, may provide limited escape options when confronted by a shark. Additionally, the ray's slow reproductive rate, with females giving birth to live young after a gestation period of around three months, may impact its ability to recover from population losses due to shark predation.
Conservation efforts are vital to ensuring the survival of the lesser electric ray. While some studies suggest that the species is not at risk of extinction, the conflicting evidence and concerns raised by conservationists highlight the need for further research and monitoring of this unique electric ray species.
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Frequently asked questions
The lesser electric ray is not currently listed as endangered. While some studies suggest that the species is not facing immediate threats, its population status remains a concern, with some classifications listing it as critically endangered.
The lesser electric ray is a unique species of fish known for its ability to generate electric charges of about 14 to 37 volts, which it uses to stun prey and for self-defence. It is found in the western coastal fringes of the Atlantic Ocean and the Caribbean Sea, typically in inshore waters up to 120 feet deep.
The lesser electric ray has a kidney-shaped body and a short, thick tail. Its colouration varies from grey to reddish-brown, often with dark blotches, rings, or dots forming patterns on its back. Its head is thick and fleshy, and its front body forms a round disk with extended pectoral fins.
The lifespan of the lesser electric ray is believed to be around 15 years. Females mature at the age of two and can give birth to up to 20 live young at a time.
A 2005 paper reported a 98% decline in the population of lesser electric rays, attributing this decline to shrimp trawling bycatch. This led to the species being classified as critically endangered on the IUCN Red List. However, subsequent analyses have questioned the methodology of the 2005 paper, suggesting that the species is not at risk of extinction.
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