Wfb 232 Ichthyology Taxonomy, Week 6 7 March 2005




Дата канвертавання19.04.2016
Памер9.93 Kb.
WFB 232 Ichthyology

Taxonomy, Week 6 7 March 2005



Superclass Gnathostomata

Class Actinopterygii

Subclass Neopterygii

Division Teleostei

Subdivision Euteleostei

Superorder Protacanthopterygii

Order Esociformes (Pikes, mudminnows)



No adipose fin, soft-rayed, physostomic, no teeth on maxillaries

Distributed throughout North America and Eurasia

Family Esocidae (pikes)



Freshwater

Piscivorous, with voracious appetites, will also eat other pike

Found in lakes & slow rivers, in shallow water

Elongate body (sagittiform), long snout/jaws, with sharp teeth (piscivorous)

Dorsal & anal fins situated far back on body, near caudal region.

Highly prized sportfish; also commercial fishery in Eurasia

Esox masquinongy can reach several feet in length, 40-60 lbs.

IN VERMONT:

Redfin pickerel, Esox americanus americanus

Chain pickerel, Esox niger

Northern pike, Esox lucius

Muskellunge, Esox masquinongy

Family Umbridae (Mudminnows)

Small – less than 15 cm long; freshwater

Prefer slow water – bogs, slow streams, feed on invertebrates (plankton & insects)

Hide in mud when disturbed – can tolerate dry periods by burrowing in sediments

Disjunct distribution - 1 genus, Umbra, with 4 species worldwide – central Europe, central N. America, Atlantic coast of N. America, and Olympic Peninsula in the state of Washington.

IN VERMONT: Central mudminnow, Umbra limi


Order Osmeriformes (smelts, argentines, salangids, galaxiids)

Marine, freshwater, & anadromous species – distributed worldwide

No nuptial tubercles, most have adipose fin

Some species can estivate in droughts, others emit odor similar to cucumbers!

Generally silvery in color; some deep-sea species are bioluminescent

Southern grayling – Australia region (Not a salmonid grayling) – only right gonad is present


Family Osmeridae (smelts)
Fresh & salt water, 7 genera, 11 species

Popular food fish, spawn in sand or gravel in large numbers (good for dip netting)

Ayu – Japanese “sweetfish” – captured using cormorants tethered to a boat

IN VERMONT: Osmerus mordax, Rainbow smelt

Order Salmoniformes
1 extant family – Salmonidae (trouts, salmons, chars, whitefishes, graylings)

Soft rayed, physostomus, swim bladder, adipose fin

Many species are sport fishes; widely stocked worldwide for sport fishing

Freshwater, landlocked, or anadromous

Endemic to entire northern hemisphere; many have been transplanted in southern hemisphere

Mostly piscivorous

Most Pacific salmon are reknowned for their homing abilities – highly selective to their natal tributary when returning from the ocean to spawn.

Cretaceous period – 144 MYA, probably basal group for higher fishes

IN VERMONT:

Charr:


Salvelinus fontinalis, brook trout

Salvelinus namaycush, lake trout

Trout:


Salmo salar, Atlantic salmon

Salmo trutta, brown trout

Salmon:


Oncorhynchus mykiss, rainbow trout

Whitefish:



Coregonus artedii, cisco or lake herring

Proscopium cylindraceum, round whitefish

Coregonus clupeaformis, lake whitefish





База данных защищена авторским правом ©shkola.of.by 2016
звярнуцца да адміністрацыі

    Галоўная старонка