Ichthyological terms, not general ones.
Any member of the predominantly aquatic arthropod grouping Crustacea which currently contains almost 70,000 recognised species, including all crabs, lobsters, crayfish, shrimp, krill and barnacles. It's difficult to define their characteristics since the group is of arguable hierarchical status, generally regarded to represent either a Phylum or Subphylum.
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A crustacean of the order Amphipoda, most of which are small and have a laterally-compressed shape. The suborder Gammaridea contains all freshwater species.
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Member of the copepod crustacean genus Lernaea. Adult females are parasitic on freshwater fishes.
Commonly known as brine shrimp; a genus of phyllopod crustacean inhabiting salt lakes and brines. Cultivated as food for aquarium fishes and available live, frozen or freeze-dried. Its newly-hatched nauplii are also a popular food for fish fry.
Used in 1,159 profiles
Any member of the phylum Arthropoda, these being characterised by a (usually) chitinous exoskeleton and segmented body to which jointed appendages are attached in pairs. Arthropods include the insects, crustaceans, arachnids, myriapods, and extinct trilobites, and comprise the largest phylum in the animal kingdom.
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Genus of isopod crustaceans in the family Asellidae. Contains the well-known 'water louse', Asellus aquaticus.
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Carotenoid pigment found naturally in some fishes, crustaceans, microalgae and yeasts. Known to improve conditioning/colouration and used in some fish foods.
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The hard upper shell of a tortoise, crustacean, or arachnid.
Large, pincer-like claw of a crustacean or arachnid, as seen in lobsters, crabs, scorpions, etc..
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Order of small, aquatic crustaceans commonly referred to as 'water fleas'.
Any member of the subclass Copepoda, a group of small marine and freshwater crustaceans of which the planktonic species are important to global ecology, forming the main constituent of oceanic zooplankton. Some species are parasites of fishes.
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Sand originating from marine environments via bioerosion of the calcareous skeletal structures possessed by some organisms. Coral is not the chief constituent, however, with the majority of material deriving from foraminifera, calcareous algae, molluscs, and crustaceans.
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Any representative of the genus Daphnia; small, planktonic crustaceans commonly referred to as 'water fleas' and often used as food for ornamental fishes. They're members of the order Cladocera and reproduce by parthenogenesis.
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Any member of the crustacean order Decapoda, comprising species possessing 5 pairs of jointed, thorassic limbs such as crabs, crayfish, lobsters and shrimp. Also used historically in reference to molluscs of the Cephalopod superorder Decapodiformes, members of which have 8 short limbs plus 2 longer tentacles and include cuttlefish and squid.
External skeleton, often forming a hard, shell-like outer covering typical in insects, crustaceans and some molluscs. Usually chitinous but may also be composed primarily of calcium carbonate or silica.
Large genus of amphipod crustacean in the family Gammaridae of which members occur in both fresh and salt water. An important source of food for many fishes.
Used in 2 profiles
Any member of the crustacean order Isopda, comprising species with 7 pairs of legs and lacking a fully-formed carapace.
Used in 1 profile
Vernacular term for any small, shrimp-like, marine crustacean of the order Euphausiacea. Represent an important, sometimes principal, proportion of the diet of many marine fishes and mammals. Available as food for ornamental fishes, usually in frozen form.
Used in 14 profiles
Any member of the shrimp-like crustacean order Mysidacea.
Genus of mysid crustacean of which members inhabit both marine and freshwater environments. Some species are used as fish food in aquaria, and usually available frozen.
Used in 21 profiles