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Ocean Frontiers Diving & Snorkeling Adventures in the Cayman Islands

Lionfish Patrol in Grand Cayman

Lionfish Patrol in Grand Cayman
An environmental project to remove the invasive Lionfish from Cayman Islands waters. By participating you will be doing your part as a scuba diver.

Trips Per Diver

Our original weekly Lionfish culling trips had been so effective since 2011, they became no longer effective in making any further impact on controlling the invasive Lionfish populations.  It is important to adapt to this next phase of protecting our reefs with a new line of defense.  Our new Lionfish culling strategy, provides more targeted culling where it is needed most, rather than the blanket approach that was necessary in the beginning. Our three pronged approach still allows divers to buddy with a licensed culler as spotters, or take it one step further and become a certified culler and help with Reef Patrol Duty on an ongoing basis. 

1- Reef Patrol Buddy 
US$130 fee per two tank, $100 per 1 tank. Does not include cost of dive boat trip. Buddy with a licensed Lionfish Culler Staff and learn hands on how to do a good deed for Cayman's reefs and rid them of the invasive Red Lionfish. Cull, de-spine, fillet and take home to eat, or have Eagle Rays fix you up some of their famous Lionfish Tacos.

Reef Patrol Buddy Highlights: 

  • Find and spear Lionfish hiding on the reefs
  • Do your part to help the environment
  • Excellent team or group activity
  • Each team is lead by a Divemaster licensed to spear and remove Lionfish from Cayman's reefs

This dive service is part of an environmental project to remove the invasive Lionfish from Cayman Islands waters. By participating you will be doing your part as a scuba diver to help protect our coral reefs. 

Trip Details:

  • Add the Lionfish Reef Patrol Buddy option to any 2-Tank Boat Dive
  • Keep what you catch and take to Eagle Ray's Bar & Grill to be cooked
  • Dive with your own private guide and help spot Lionfish
  • Price US$130 for 2-Tank or $100 for 1-Tank trip

Other options include:-

 2- Lionfish Specialty Certification (2-Tank)  
US$250 add-on fee, Lionfion Hunter certification requires two lionfish culling dives and supporting classroom sessions. Does not include cost of dive boat trip.

 3- Reef Patrol Duty (Dive Staff Only)
A Licensed Lionfish Culler staff member, patrols the reef to remove the invasive species. This can take place on any trip where suitable and at sites where Lionfish have been sighted and reported.

The Red Lionfish were first spotted in Grand Cayman in 2009 and have since established a large and growing population.  In January 2010, Ocean Frontiers decided it had reached a point where direct action needed to be taken.  The Red Lionfish were eating our native species of juvenile fish and damaging the balance of our fragile coral reef ecosystem.  Red Lionfish were introduced to the Caribbean region by mankind and we feel it is our duty to make our best efforts to try and un-ring the bell. 

Whilst we don't expect to ever completely remove the Red Lionfish from it's new home in the Cayman Islands,  we have managed to keep their population in check and do our best as scuba divers to reduce the numbers to a minimal level.

Dive Staff using spears are licensed by the Cayman Islands Department of Environment and have completed a training program.  Spearing of any other fish on Scuba in the Cayman Islands is prohibited and a violation of the Cayman Islands Marine Conservation Laws.

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.

Lionfish Culling in the Cayman Islands with Ocean Frontiers - Image 1

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.

Lionfish Culling in the Cayman Islands with Ocean Frontiers - Image 2

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.