Red Lionfish Hunt

Help the environment and join a Lionfish Hunt remove this invasive species from the reef in Grand Cayman Cayman
 
 
 

Red Lionfish Hunt

NEW Lionfish Hunting / Culling trips and classes coming soon - starting in July 2018, please ask for details. 

 


Additional Reading: 

What is the morphology and lifespan of Red Lionfish (Pterois volitans)?
1. The body is white or cream colored with red to reddish brown vertical stripes with the stripes alternating from wide to very thin and sometimes even merging along the flank to form a V.
2. The Lionfish has elongated venomous dorsal and anal fin spines. There are 13 dorsal spines, 10 to 11 dorsal soft rays, 3 anal spines, 6 to 7 anal soft rays and 2 pelvic spines. The fin membranes are often spotted or have small holes.
3. In their natural habitat they are commonly found to be between 320mm – 350mm/12.6 -13.8 inches in size, but they have been found as big as 474mm/18.7 inches.
4. In recent research conducted by REEF of non-native Lionfish, the average size found was 188mm/7.4 inches with the size range 25mm – 389mm/1 - 15.3 inches.
5. The largest Pterois Volitans / Red Lionfish specimen collected on the U.S. east coast, caught via hook and line off North Carolina in 2004, was over 430 mm/16.9 inches long and weighed approximately 1.1 kg/2.4 pounds.
6. The lifespan in the wild is up to 15 years, but as yet the lifespan in non-native waters has not been determined.

 

What is the habitat preference and behavior of Red Lionfish (Pterois volitans)?

1. Lionfish exhibit high site fidelity, i.e. they do not move much, and they are commonly seen in a nearly motionless posture with the head tilted slightly down.
2. Lionfish have been sighted in a wide variety of habitat types including; artificial sites, canals, harbors, estuaries, mangroves and shallow and deep reefs. From observations they appear to be at home and fully adapted to all these differing habitats.
3. Lionfish have been observed in water as cold as 13°C/56°F off the southern coast of Long Island, New York and as warm as 27°C/81°F in areas such as Turks and Caicos Islands, showing a tolerance to a wide range of temperatures.
4. It has been revealed that Lionfish stop feeding at temperatures of 16°C/61°F and below and that the average lethal low temperature is 10°C/50°F.
5. Lionfish are now being found in a large depth range from 0.6 metres/2 feet to 175 metres/574 feet, well beyond recreational dive depth limits.

 

What are the reproduction and growth facts of Red Lionfish (Pterois volitans) ?
1. As juveniles Lionfish live in small groups, but as adults they typically occur alone with individuals being relatively inactive during the day, typically sheltering in reef crevices.
2. Lionfish are reaching sexual maturity and reproducing as young as one to two years old and data collected to date (REEF) suggests that the Lionfish appear to be reproducing year round in Bahamian and other Caribbean waters.
3. As stated, Lionfish are generally solitary fish but during courtship males will aggregate with multiple females to form groups of three to eight fish, with the males using their spines and fins in an aggressive visual display.
4. Following complex courting and mating behaviors, the females release a pair of mucus coated clusters of eggs approximately every 30 days, which are then fertilized by the males. On average, these clusters contain between 2,000 and 15,000 eggs, although this number can be as high as 30,000 eggs.
5. The eggs are then freed by environmental micro bacteria, which break down the egg mass.
6. The larvae hatch after approximately four days and become competent swimmers two to three days after that. At this stage in their development Lionfish are already able to capture and consume ciliates and other small zooplankton.
7. The larvae metamorphose into adults at approximately 10-12 mm/0.4 – 0.5 inches in size, which is in the range of 20-40 days. The time period it takes Lionfish to reach their adult stage is long enough for eggs released in the Caribbean, i.e. Cuba, Jamaica or the Cayman Islands to disperse into the Gulf of Mexico.

stomach-contents-lionfish-cayman  

What are the hunting methods of the Red Lionfish and what is the prey?
1. Given the tendency of the Lionfish to retreat to areas of hiding by day, this species was thought to be mostly nocturnal. However, recent studies have now shown that Lionfish have been observed feeding during the day.
2. Hunting behaviour includes the Lionfish hiding in unexposed places during the day, with its head down practically immobile, to stalking and cornering its prey by use of the outstretched and expanded pectoral fins when in full ambush mode. Lionfish prey is ultimately obtained with a lightning-quick snap of the jaws and swallowed whole.
3. The Lionfish is an undiscerning predator of small fish, shrimps, crabs and similarly sized animals and research has shown that of analyzed stomach contents, 70% was comprised of fish and 30% were crustaceans. Cannibalism has also been observed for this species in the wild as well as in captivity.
4. The most abundantly found prey in the Lionfish stomachs included basslets, shrimp and gobies and other cleaner fish. Other stomach contents included whole crabs, whole sand divers, jawfish with the eggs still in its mouth, and even juvenile groupers.
5. When consuming a large meal the Lionfish is capable of expanding its stomach over 30 times in volume, it is also capable of long term fasting and can go without food for periods of over 12 weeks without dying.
6. In its native range the Lionfish consumes 2.5% - 6% of its body weight per day.

Invasive Red Lionfish  

Are Lionfish venomous?
1. Scorpion fishes get their common name from their ability to defend themselves with a venomous “sting” or stab.
2. Thirteen of the long dorsal spines, two pelvic and three of the anal spines are venomous, with the venom being produced by glands located in grooves on the spines covered with skin.
3. Lionfish have venomous spines from birth and these spines are used by the Lionfish both to capture their prey and deter predators.