Arthropod Order Mysida (Mysis Shrimp)

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Crustacea-Malacostraca (Crayfish, Scuds, and Sowbugs)

» Order Mysida (Mysis Shrimp)

Common Names

Match	Common Name
	Mysis Shrimp
	Opossum Shrimp

Mysis shrimp also commonly known as opossum shrimp for the way they carry their broods, can be important to anglers as a curious bi-product of fisheries management practices. Fish and Game departments looking for a way to supplement the diets of planted kokanee salmon introduced these species from the Far North decades ago into many of the newly formed reservoirs. While not providing angling opportunities in the impoundments, they are often trapped in the dam's turbines and flushed down the tailwaters by the millions to feed the waiting trout. Their stunned or dead state makes them easy pickings. When these events occur the fish will really focus on them.

Mysida are not true shrimp and their appearance is unique. The species most commonly planted are virtually crystal clear transparant and they are more nymph shaped than shrimp shaped. Their legs are toward the front and they have a carapace (

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The carapace of this Baetisca laurentina nymph is highlighted in green.

Carapace: A hard, protective shell on the back of an animal. In mayflies, this refers to the enlarged section of the mesonotum which forms the "humps" of Baetisca nymphs.) that covers the head and thoracic (Thorax: The thorax is the middle part of an insect's body, in between the abdomen and the head, and to which the legs and wings are attached.) segments. They also have appendages off the last abdominal segment that could be mistaken for tails. They have dark compound eyes (

The compound eyes of a male Isonychia bicolor mayfly spinner.

Compound eye: The eyes of many arthropods, including insects and crustaceans, are composed of anywhere from 12 to 1,000 facets called ommatidia. These are called compound eyes.).

Mysida Fly Fishing Tips

Mysis shrimp availability is hard to time so the angler fishing tailwaters below populations of these critters should always be prepared. Their clear bodies present special problems for the angler both in terms of imitation and detection. Over the years many successful patterns have been developed from complex to as simple as wrapping cellophane on a hook. The naturals are very difficult to see in the water though the fish don't seem to have this trouble.

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Jargon Defined:

Broods: When a species produces more than one generation per year, each one is called a brood.

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The carapace of this Baetisca laurentina nymph is highlighted in green.

Carapace: A hard, protective shell on the back of an animal. In mayflies, this refers to the enlarged section of the mesonotum which forms the "humps" of Baetisca nymphs.

The compound eyes of a male Isonychia bicolor mayfly spinner.

Compound eyes: The eyes of many arthropods, including insects and crustaceans, are composed of anywhere from 12 to 1,000 facets called ommatidia. These are called compound eyes.

Naturals: A natural is a real insect (or similar creature) a trout might eat. The term is used to specify the real thing as opposed to its artificial imitation.

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Thoracic: The thorax is the middle part of an insect's body, in between the abdomen and the head, and to which the legs and wings are attached.