Family Salmonidae (Trouts and Allies)

Salmonidae thru Antennaridae1

Family Salmonidae (Trouts and Allies)

Usually recognized as three subfamilies.o Salmon and Trouto Graylingso Whitefish

Species of interest:o Atlantic Salmon

(Salmo salar)


Salmon and Trout

Have fine scales and a short dorsal fin Dominate cold water (Northeast U.S.)

Anadromous

Atlantic Salmon


Osmoregulation of Fishes

Osmoconformers - have internal ionic concentrations identical to the surrounding water

Osmoregulators - control the internal ionic concentration of their tissues


Osmoregulation of fishes


Life History stages of Anadromous Salmonids

Alevin (yolk-sac larvae)

Fry Smolt Adults


Aquaculture of Salmonids

Some facilities raise individuals from hatch to harvest

Others only raise individuals a short time and release them to enrich natural populations.

What are some problems associated with aquaculture?


Salmonidae Aquaculture

Egg and Milt Harvest

Fish Pens

Prince William Sound Aquaculture

http://www.pwsac.com/

http://www.pwsac.com/


Family Synodontidae

Lizardfishes Local species:

o Inshore Lizardfish (Synodus foetens)

o Sand Diver (Synodus intermedius)

Synodus intermedius


Synodontidae

Benthic dwellers that usually occur in shallow water

Ambush predators, blends with surroundings

Synodus foetens


Family Batrachoididae

Toadfishes Local species:

o Oyster Toadfish (Opsanus tau)

o Atlantic Midshipman (Porichthys plectrodon)

Opsanus tau


Batrachoididae Characteristics

Well camouflaged benthic marine fisheso Common in shallow water habitats

Naked body, barbels around the moutho Some species have two lateral lines

Dorsal fin has spines


Batrachoididae Vocalizations

Oyster Toadfish and Midshipman make incredibly loud sounds by vibrating its swimbladder


Swimbladders

The density of seawater increases the buoyancy of the animals that live in ito Swimbladders constitute only 5% of the

body volume in marine spp.o 7% in freshwater spp.


Physostomous Swimbladders

Has a connection between the swimbladder and the gut (pneumatic duct)o Inflate swimbladder by gulping air at the

surface

Usually found in ancestral soft-rayed fishes (Herrings, Salmonids and Cyprinids)


Physoclistous Swimbladders

Have special structures associated with the circulatory systemo A network of capillaries and gas gland

allow the inflation and deflation of the swimbladder

Frees fish from their dependency on the surface


Order Lophiiformes

Goosefish and Frogfishes

Fishes in this order are commonly called Anglerfisheso Family Lophiidae

• Goosefishes

o Family Antennariidae

• Frogfishes

Goosefish


Goosefishes

All have similar methods in attracting prey (Anglerfish)o Illiciumo Escao Illicium and esca

are waved to mimic and attract prey


Common Species

Goosefish (Lophius americanus)o Marketed as

Monkfisho Can reach 4ft.

50lbs.


Family Antennaridae (Frogfishes)

Associate with drifting Sargassum and hard structures on the benthos

Share many similar characteristics with Lophiidae

Have globose bodies that can walk across the bottom on their pectoral and pelvic fins


Antennaridae Characteristics

Scales resemble projections

Limited to the 20° isotherm


Common species

Sargassumfish (Histrio histrio) Drifts in Sargassum blending with its surroundings

Family Salmonidae (Trouts and Allies)

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