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By Bob Goemans
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Histrio

Histrio histrio

(Linnaeus, 1758)

Sargassum Frogfish, Sargassumfish

Not Reef Tank Suitable

Likely Fish-Only Tank Suitable

Range: All tropical seas except the Eastern Pacific Ocean.

Size: 8 inches (20 cm)

Natural Environment: Inhabits floating masses of Sargassum seaweed and mainly feeds on small fishes and crustaceans.

General Husbandry: Rarely collected for the trade. Has a yellowish body and depending upon area of collection, sometimes seen with numerous brown patches on the body and fins. Equipped with an angling lure that dangles an enticing looking object near its mouth.

Even though always associated with floating Sargassum seaweed in the wild, can be maintained without it, yet then should have branches of stony corals (or artificial decor) to rest on while waiting a meal, and be preferably placed near the surface of the water.

Is capable of swallowing fish twice its size, therefore chose tankmates carefully!

Best maintained in fish-only aquariums with tankmates too large to be eaten, or possibly a single species aquarium.

As to diet, keep in mind these fish are carnivores, and require a diet high in protein and amino acids (lipids/fats). Products such as live marine fish and/or marine fish and crustacean flesh, clams, and other marine meaty foods should make up the majority of their diet. Non-living foodstuffs can be suspended/impaled on a long thin stick and dangled within range to entice feeding.

However, ‘occasional’ live mollies, guppies, goldfish, and/or Gambusia provide for that natural feeding excitement found in the wild should live marine fish not be available. Nevertheless, feeding these small freshwater live fish should be considered a special treat and not become a steady diet since they lack the fatty acids that marine fish need to stay healthy.

Keep in mind that feeder goldfish, which cannot survive but a few minutes in seawater, also carry many different bacteria, fungi, and protozoa that can cause parasitic and infectious diseases. Furthermore, feeder goldfish can also cause blockage in the digestive track and/or kidney along with liver damage due to fatty degeneration in the consuming fish. And this will ultimately lead to the consumer’s death. In fact, fatty liver degeneration is a common cause of death in cases where marine fish are fed a diet that primarily consists of goldfish (as with Lionfish for example). Also, its possible the large air bladder in the goldfish can upset the internal balance in this fish, sometimes causing it to float at the surface, possibly killing it.

For those aquarists living near the coastline there are often fisherman bait shops that sell small live marine fish that can be used as bait. If available, these small live marine baitfish are an excellent foodstuff.

Because these are sedentary fish, their metabolism is quite low. Therefore infrequent feedings of once or twice a week for adults and three or four times a week for juveniles is recommended.

Susceptible to Amyloodinium and Cryptocaryon, therefore prevent sudden temperature changes and/or other stressful conditions, as this opens a window of opportunity for these maladies.

Taxonomy:

    Order: Lophiiformes

    Suborder: Antennarioidei

    Family: Antennariidae

    Subfamily: Antennariinae

    Genus: Histrio

FYI: Best maintained in a single species aquarium, with proper decor.

Is one of the more aggressive species in this family! One per aquarium.

Capable of jumping out of the aquarium – requires a covered aquarium.

Will consume ornamental crustaceans.

Lacks a swim bladder, that's why they are bottom/surface dwelling fishes.

Lacks teeth, swallows prey whole.

Experience Level: Intermediate

Temperament: Semi-aggressive

Diet: Carnivore

Coral Safe: Yes

Fish Safe: With caution

Invertebrate Safe: With caution

Acclimation Time: 30 minutes+

Aquarium Environment: Fish only aquarium

Tankmates: Peaceful, yet large enough not to be eaten

Minimum Tank Size: 75+ gallons

Temperature Range: 72 - 80°F (22 – 27°C)

Specific Gravity: 1.020 - 1.026

pH: 8.0 - 8.5

 Histrio histrio (Sargassum Frogfish, Sargassumfish)
Photo © David Cook
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