Lemon Sharks, Negaprion brevirostris
Taxonomy Animalia Chordata Elasmobranchii Carcharhiniformes Carcharhinidae Negaprion brevirostris
Description & Behavior
Lemon sharks, Negaprion brevirostris (Poey, 1868), are named for their pale yellow to brown coloring on their dorsal (upper) sides and a lighter yellow on their ventral (lower) sides. The body of the lemon shark is large and robust and commonly reaches lengths between 2.4-3 m with a maximum of 3.2-3.5 m. The growth rate of the lemon shark is 0.54 cm per year.
This species has 2 dorsal fins of similar size; the first is positioned far back on the body behind the pectoral fins, the second dorsal is located slightly forward of the origin of the anal fin. There is no interdorsal ridge. The pelvic fin has slightly concave rear margins and the outer margin of the pectoral fin is slightly convex. Both pelvic and pectoral fins are slightly curved (falcate). This shark has a blunt, short snout.
World Range & Habitat
Lemon sharks, Negaprion brevirostris, inhabit coastal inshore northeast Atlantic waters from New Jersey in the US to Southern Brazil and the Gulf of Mexico and Caribbean. It is thought that the latter 2 regions are 2 separate populations. Lemon sharks can be found along the coasts of Senegal and Ivory Coast in the eastern Atlantic. In the North Pacific, lemon sharks range from the Gulf of California and Baja California south to Ecuador.
Lemon sharks are commonly found in subtropical shallow waters to depths of about 92 m near coral reefs, mangroves, enclosed bays, and sounds and river mouths, although lemon sharks do not seem to travel far into fresh water. They can be found in open water during migrations, but overall they tend to stay along the continental and insular shelves. This species is known to form groups based on size and sex and have been observed in groups near docks and fishing piers at night, returning to deeper water during the day.
Feeding Behavior (Ecology)
Lemon sharks, Negaprion brevirostris, feed on bony fish including: catfish, mullet, jacks, croakers, porcupine fish, and cowfish; as well as guitarfish, stingrays, eagle rays, crabs, and crayfish. On occasion lemon sharks will also eat sea birds and smaller sharks.
The lemon shark, Negaprion brevirostris, is placentally viviparous, meaning females form a placenta-like connection with each of the developing fetuses and eventually give birth to live free-swimming pups. Females and males reach sexual maturity at 6-7 years of age or at 2.4 m and 2.24 m respectively. Mating takes place in the springtime in shallow water followed by a 10-12 month gestation period. Females return to shallow nursing grounds between April-September to give birth to 4-17 pups that measure between 60-65 cm. Pups remain in the nursing grounds for several years, their range expanding as they grow.
Conservation Status & Comments
Lemon sharks are hunted both commercially and recreationally. US longline fisheries target lemon sharks and they are also caught as bycatch in pelagic and gillnet fisheries. Their fins are sold for shark fin soup, and their skin is sold for leather. Lemon sharks are also sold for their meat. Populations in the western north Atlantic and eastern Pacific Ocean are declining due to overfishing.
Lemon sharks are potentially dangerous to humans, however the International Shark Attack File has only reported 10 unprovoked bites by lemon sharks, all of which occurred in Florida and the Caribbean. None of the bites were fatal. Lemon sharks do well in captivity and experiments on lemon sharks have shown they learn as quickly as some mammals and remember things for at least 6 months without reinforcement.
Negaprion brevirostris is listed as Near Threatened (NT) on the IUCN Red List of Threatened Species:
NEAR THREATENED (NT) - A taxon is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.
References & Further Research
Featured Elasmobranch – Lemon Shark @ Pacific Shark Research Center at MLML
Lemon Shark photos - Masa Ushioda - CoolWaterPhoto.com
Grant Johnson's and Katie Grudecki's Photos - Bimini Biological Field Station (Sharklab)
Elasmodiver.com - image database of sharks, skates, rays, and chimaera's from around the world by Andy Murch
[ECHENG.COM] Shark videos - Tigers, Hammerheads, Bulls and Lemons
Anatomy of a shoot: Lemon sharks in feeding frenzy (BBC)
Research Negaprion brevirostris » Barcode of Life ~ BioOne ~ Biodiversity Heritage Library ~ CITES ~ Cornell Macaulay Library [audio / video] ~ Encyclopedia of Life (EOL) ~ ESA Online Journals ~ FishBase ~ Florida Museum of Natural History Ichthyology Department ~ GBIF ~ Google Scholar ~ ITIS ~ IUCN RedList (Threatened Status) ~ Marine Species Identification Portal ~ NCBI (PubMed, GenBank, etc.) ~ Ocean Biogeographic Information System ~ PLOS ~ SCIRIS ~ SIRIS ~ Tree of Life Web Project ~ UNEP-WCMC Species Database ~ WoRMS
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