Facts about Ratfish
- 10
Ratfish belong to the order Chimaeriformes, an ancient lineage that diverged from sharks roughly 400 million years ago during the Devonian period.
- 09
Male ratfish possess a specialized reproductive appendage called a clasper located on their pelvic fins that they use to transfer sperm packets to females during mating.
- 08
A ratfish's brain comprises approximately 2.1% of its total body weight, making it one of the most encephalized deep-sea fish species relative to body size.
- 07
Ratfish belong to the class Chondrichthyes and are more closely related to sharks and rays than to any bony fish species despite their superficially fish-like appearance.
- 06
In the deep ocean, ratfish use their large pectoral fins to glide and maneuver through water with minimal energy expenditure at depths exceeding 1,000 meters.
- 05
Spotted ratfish can produce audible clicking and grinding sounds by moving their tooth plates together, likely using these vocalizations for communication or prey detection in the darkness of the deep sea.
- 04
Ratfish possess a specialized tooth plate structure that continuously grows throughout their lifetime, allowing them to crush hard-shelled prey like mollusks and crustaceans at extreme ocean depths.
- 03
Living in depths between 600 and 1,200 meters, ratfish possess large eyes adapted to detect bioluminescent light in the deep ocean twilight zone.
- 02
Ratfish eggs develop inside leathery capsules called chimaera cases that are deposited on the seafloor and take approximately 3.5 to 4.5 years to hatch.
- 01
The spotted ratfish produces a venomous spine on its dorsal fin that can cause painful wounds in humans and other predators.