Bathypterois grallator
| Tripodfish | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Aulopiformes |
| Family: | Ipnopidae |
| Genus: | Bathypterois |
| Species: | B. grallator |
| Binomial name | |
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Bathypterois grallator (Goode & T. H. Bean, 1886) |
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The tripodfish or tripod spiderfish, Bathypterois grallator, is a deep-sea benthic fish in the Ipnopidae family found at lower latitudes. It is now relatively well known from photographs and submersible observations, and seem to prefer to perch on the ooze using much elongated fin rays in the tail and two pelvic fins to stand, facing upstream with the pectoral fins turned forward so the outthrust projecting fin rays resemble multiple antennae, and are indeed used as tactile organs. B. grallator is hermaphroditic. At least 18 species are placed in the genus Bathypterois, several of which have similar appearance and behavior to B. grallator. B. grallator is the largest member of its genus, commonly exceeding a standard length of 30 cm (12 in) and reaching up to 43.4 cm (17.1 in).
The tripodfish has long, bony rays that stick out below its tail fin and both pectoral (chest) fins. The fish’s head-and-body is up to 43.4 cm (17.1 in) long, but its fins can be more than 1 m (3 ft 3 in). Most of the time, the tripodfish stands on its three fins on the bottom of the ocean, hunting for food. Even though the fins are presumably quite stiff, researchers have been successful in surprising the fish into swimming, and then the fins seem flexible. Scientists have suggested that fluids are pumped into these fins when the fish is 'standing' to make them more rigid.
Bathypterois grallator has been found relatively widely in the Atlantic, Pacific, and Indian oceans from 40°N to 40°S. It is a wide-ranging fish found from 878 to 4,720 m (2,881 to 15,486 ft) deep. Along with the giant squid, deep-sea anglerfish, and black swallower, it is one of the permanent residents found in the abyssal zone and was directly observed on the historic voyage of the bathyscaphe Trieste to the Mariana Trench.
The tripodfish uses tactile and mechanosensory cues to identify food; it apparently does not have special visual adaptations to help it find food in the low-light environment. When the fish is perched with its long rays on the ocean floor, it can get food without even seeing it. The tripodfish’s mouth ends up at just the right height to catch shrimp, tiny fish, and small crustaceans swimming by. They seem to prefer to perch on the mud using much elongated fin rays in their tails and two pelvic fins to stand, facing upstream into the current to ambush with the pectoral fins turned forward so the outthrust projecting fins resemble multiple antennae. The fish senses objects in the water with its front fins. These fins act like hands. Once they feel prey and realize it is edible, the fins knock the food into the fish’s mouth. The fish faces into the current, waiting for prey to drift by.
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Wikipedia