Family Salmonidae (Trouts and Allies) Usually recognized as three subfamilies. o Salmon and Trout o Graylings o Whitefish Species of interest: o Atlantic Salmon (Salmo salar) 1 Salmonidae thru Antennaridae Salmon and Trout Have fine scales and a short dorsal fin Dominate cold water (Northeast U.S.) Anadromous Atlantic Salmon Salmonidae thru Antennaridae 2 Osmoregulation of Fishes Osmoconformers - have internal ionic concentrations identical to the surrounding water Osmoregulators - control the internal ionic concentration of their tissues 3 Salmonidae thru Antennaridae Osmoregulation of fishes 4 Salmonidae thru Antennaridae Life History stages of Anadromous Salmonids Alevin (yolk-sac larvae) Fry Smolt Adults 5 Salmonidae thru Antennaridae 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? 6 Salmonidae thru Antennaridae Salmonidae Aquaculture Egg and Milt Harvest Fish Pens Prince William Sound Aquaculture 7 Salmonidae thru Antennaridae Family Synodontidae Lizardfishes Local species: o Inshore Lizardfish (Synodus foetens) o Sand Diver (Synodus intermedius) Synodus intermedius 8 Salmonidae thru Antennaridae Synodontidae Benthic dwellers that usually occur in shallow water Ambush predators, blends with surroundings Synodus foetens Salmonidae thru Antennaridae 9 Family Batrachoididae Toadfishes Local species: o Oyster Toadfish (Opsanus tau) o Atlantic Midshipman (Porichthys plectrodon) Opsanus tau 10 Salmonidae thru Antennaridae Batrachoididae Characteristics Well camouflaged benthic marine fishes o Common in shallow water habitats Naked body, barbels around the mouth o Some species have two lateral lines Dorsal fin has spines 11 Salmonidae thru Antennaridae Batrachoididae Vocalizations Oyster Toadfish and Midshipman make incredibly loud sounds by vibrating its swimbladder 13 Salmonidae thru Antennaridae Swimbladders The density of seawater increases the buoyancy of the animals that live in it o Swimbladders constitute only 5% of the body volume in marine spp. o 7% in freshwater spp. 14 Salmonidae thru Antennaridae 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) 15 Salmonidae thru Antennaridae Physoclistous Swimbladders Have special structures associated with the circulatory system o A network of capillaries and gas gland allow the inflation and deflation of the swimbladder Frees fish from their dependency on the surface 16 Salmonidae thru Antennaridae Order Lophiiformes Goosefish and Frogfishes Fishes in this order are commonly called Anglerfishes o Family Lophiidae • Goosefishes o Family Antennariidae • Frogfishes Goosefish 17 Salmonidae thru Antennaridae Goosefishes All have similar methods in attracting prey (Anglerfish) o Illicium o Esca o Illicium and esca are waved to mimic and attract prey 18 Salmonidae thru Antennaridae Common Species Goosefish (Lophius americanus) o Marketed as Monkfish o Can reach 4ft. 50lbs. 19 Salmonidae thru Antennaridae 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 20 Salmonidae thru Antennaridae Antennaridae Characteristics Scales resemble projections Limited to the 20° isotherm 21 Salmonidae thru Antennaridae Common species Sargassumfish (Histrio histrio) Drifts in Sargassum blending with its surroundings 22 Salmonidae thru Antennaridae