(redirected from ratfish)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to ratfish: Chimaeriformes


Any individual organism or molecule derived from 2 or more species.
An organism that results when an embryonic part of one organism is grafted onto another.

An organism with 2 or more cell lines, genotypes or karyotypes descended from at least 2 zygotes. Chimeras are very rare, only occur in twins and result from chorionic vascular anastomoses, transplantations or double fertilisations and subsequent participation of both fertilised meiotic products in one developing embryo; all hermaphrodites should be karyotyped to evaluate possible chimerism.

Molecular biology
(1) An animal formed from two different embryonic sources. In mouse genetics, targeted mutations produced in embryonic stem cells are recovered by breeding chimeric mice, resulting from the mixture of embryonic stem cells with a genetically distinct blastocyst.
(2) A clone containing genomic DNA from nonadjacent genomic segments or cDNA from two different mRNAs.

The term chimera was once used for a person who had received transplanted tissue—e.g., bone marrow surviving in a recipient.


  1. (also called graft-hybrid) an organism, usually a cultivated plant, whose tissues are of more than one genetical type as a result of mutation or grafting.
  2. a smooth-skinned cartilaginous deep-sea fish (‘king of the herrings’) of the subclass Holocephali, which were common in the Jurassic.
  3. a DNA hybrid molecule: a composite DNA molecule produced by GENETIC ENGINEERING, made up of DNA fragments from more than one organism. It is named after the Chimaera of Greek mythology, a beast with the head of a lion, the body of a goat and the tail of a serpent.

chimera, chimaera

1. a mythological, fire-spouting monster with a lion's head, goat's body and serpent's tail.
2. an animal whose body contains different cell populations derived from different zygotes of the same or different species, occurring spontaneously or produced artificially; i.e. an individual composed of a mixture of genetically different cells.

chimera protein
see fusion protein.
References in periodicals archive ?
Combining fishing and acoustic monitoring data to evaluate the distribution and movements of spotted ratfish Hydrolagus colliei.
spotted ratfish, dover sole, rex sole, and Pacific hake; Fig.
Total assemblage biomass at depths of 80 and 160 m principally comprised spotted ratfish year round and spiny dogfish seasonally.
Spiny dogfish have a diverse diet, feeding on Pacific herring, flatfish, spotted ratfish, salmonids, as wells as a wide range of benthic and pelagic invertebrates (Reum and Essington, 2008; Beamish and Sweeting, 2009).
spiny dogfish) and we confirmed the findings of other researchers who have identified spotted ratfish as one of the most abundant fishes in the Puget Sound region (Quinnel and Schmitt (3)).
uariegatus) spotted ratfish (Hydrolagus colhei) unidentified hagfishes (Eptatretus spp.
Lingcod Ophiodon elongatus Pacific cod Gadus macrocephalus Arrowtooth flounder Atheresthes stomias Dover sole Microstomus pacificus Pacific halibut Hippoglossus stenolepis Spotted ratfish Hydrolagus colliei Spiny dogfish Squalus acanthias Longnose skate Raja rhina Big skate Raja binoculata Salmon Oncorhynchus spp.
Other skates Rajiformes Pacific Cod Gadus macrocephalus Pacific Flatnose Antimora micolepis Pacific Grenadier Coryphaenoides acrolepis Pacific Hake Merluccius productus Pacific Halibut Hippoglossus stenolepis Pacific Ocean Perch Sebastes alutus Pacific Sanddab Citharichthys sordidus Petrale Sole * Eopsetta jordani Redbanded Rockfish Sebastes babcocki Rex Sole * Glyptocephalus zachirus Rosethorn Rockfish Sebastes helvomaculatus Sablefish * Anoplopoma fimbria Shortspine Thornyhead * Sebastolobus alascanus Pacific Spiny Dogfish Squalus suckleyi Splitnose Rockfish Sebastes diploproa Spotted Ratfish Hydrolagus colliei Widow Rockfish Sebastes entomelas Yelloweye Rockfish Sebastes ruberrimus % of % of Common name inshore tows offshore tows Arrowtooth Flounder * 64.
The research on ratfish over the next three years will take Dagit to Iowa State University, New York and Paris.
To look at a ratfish via a 3-D CAT scan will provide a unique look at the specimens.
Dagit has been conducting research on ratfish since her senior thesis in college and she is the world's leading expert on ratfish diversity and evolution.