Slippery Dick Wrasse

Halichoeres bivittatus is a Western Atlantic wrasse found from North Carolina and Bermuda south to Brazil, including the Gulf of Mexico and the Caribbean Sea. It occupies shallow coral reefs, seagrass beds, and sandy flats broken up by coral rubble, generally between one and fifteen meters, and is a common sight around harbors and docks. Coloration shifts dramatically with maturity: juveniles and initial-phase females are pale to white with two dark longitudinal stripes, while terminal-phase males develop green, pink, and yellow tones along with a black spot on the dorsal fin and another at the base of the tail. Like other members of the genus, it is a protogynous hermaphrodite, and mature specimens can approach 14 inches.

Given the adult size and the relentless swimming habit of this species, a 125-gallon aquarium is the practical starting point, with a long footprint and generous open water taking priority over dense rockwork. A deep bed of fine, soft, non-silica sand is essential, since the fish dives into the substrate to sleep and to escape perceived threats; coarse gravel can abrade the skin and lead to infection. Seat live rock directly on the tank bottom rather than on the sand so that constant excavating does not undermine the aquascape. A tight-fitting lid is mandatory, as this is a proven and capable jumper. Strong filtration and efficient protein skimming help keep pace with the heavy feeding and waste output of a fish this size, and a mature, established system suits its rock-flipping, substrate-sifting routine.

In the wild, this wrasse is an opportunistic carnivore that patrols the bottom for crabs, hermit crabs, mollusks, sea urchins, polychaete worms, and assorted small invertebrates, and it will take small fish when the chance presents itself. That foraging instinct carries straight into the aquarium, where the fish spends much of the day probing sand and turning over rubble in search of live prey.

Captive feeding is rarely a challenge. Most specimens accept food from the first day, including frozen mysis and brine shrimp, chopped seafood and clam meat, krill, marine pellets, and flake. Offer two to three feedings per day to match the high metabolism of an active swimmer, and vary the menu so that meaty items remain the backbone of the diet. As a bonus, this species is an effective hunter of pest flatworms, bristleworms, and pyramid snails.

Frozen Mysis Shrimp Frozen Brine Shrimp Chopped Seafood Clam Meat Krill Marine Pellets Marine Flake
Expect a bold, curious, thoroughly diurnal fish that covers ground all day, inspecting the sand bed and flipping small rocks for prey before burying itself at dusk. Territoriality toward conspecifics is pronounced, and the safest approach is a single specimen, or a single male kept with one or more females in a large system. Reports on temperament vary, with some accounts describing significant aggression toward other fish and others describing an even-tempered community resident; treat it as semi-aggressive and plan accordingly. Robust, active tankmates such as tangs, larger angelfish, and damsels are the most reliable pairings, while timid, slow-feeding fish are a poor match. Mild sparring with other Halichoeres should be anticipated.

With respect to corals and sessile invertebrates, this wrasse causes no direct harm. The complication is mobile invertebrates: several accounts report predation on ornamental shrimp, crabs, snails, and sea urchins, while one indicates that clams and ornamental shrimp are left alone. Because of that disagreement, treat it as reef safe with caution and consider any small mobile invertebrate at risk. Foraging behavior also means loose frags, small rocks, and lightly seated corals may be shifted around, so secure everything you do not want relocated.

FAQ

Frequently Asked Questions

About the Slippery Dick Wrasse

  • Will this wrasse harm my cleanup crew?
    Reports conflict, with several indicating that it preys on ornamental shrimp, crabs, snails, and sea urchins, and one indicating that shrimp and clams are left alone. It is consistently credited with eating pest flatworms, bristleworms, and pyramid snails.
  • What substrate does this species require?
    It needs a deep bed of fine, soft, non-silica sand, roughly two to four inches or more, so it can bury itself to sleep or hide. Coarse gravel can cause abrasions that lead to infection.
  • Does it need a covered aquarium?
    Yes. This wrasse is a known and capable jumper, so a tight-fitting, secure lid is mandatory on any tank housing it.