280 likes | 700 Vues
Early Life History. Fish Life Cycle Terminology Larval adaptations Fish Larvae Science. Fish Life Cycle. Spawning. Adults. Eggs. ADULT Environment. PELAGIC Environment. Juveniles. Larvae. Settlement. Larval Development Stages.
E N D
Early Life History Fish Life Cycle Terminology Larval adaptations Fish Larvae Science
Fish Life Cycle Spawning Adults Eggs ADULT Environment PELAGIC Environment Juveniles Larvae Settlement
(a) lake sturgeon, Acipenser fulvescens; (b) bloater, Coregonus hoyi; (c) chinook salmon, Oncorhynchus tshawytscha; (d) lake trout, Salvelinus namaycush; (e) northern pike, Esox lucius; (f, g) common carp, Cyprinus carpio; (h) brown bullhead, Ameiurus nebulosus; (i) largemouth bass, Micropterus salmoides; (j) yellow perch, Perca flavescens; (k) American eel, Anguilla rostrata; (l) Japanese anchovy, Engraulis japonicus; (m) Atlantic herring, Clupea harengus; (n) haddock, Melanogrammus aeglefinus; (o) walleye pollock, Theragra chalcogramma; (p) Atlantic cod, Gadus morhua; (q) striped bass, Morone saxatilis; (r) Atlantic croaker, Micropogonias undulatus; (s) bluefin tuna, Thunnus thynnus; California halibut, Paralichthys californicus.
Gadidae Gadus morhua
Molidae Mola mola
Pelagic larvae adaptations
Piscivorous larvae
Metamorphosis Bothidae Bothus ocellatus
Fish Life Cycle Spawning Adults Eggs ADULT Environment PELAGIC Environment Juveniles Larvae Settlement
End of larval phase • Settlement • Metamorphosis • Recruitment • Colonization
Post-flexion Epinephelus morio
Larval Transport Mechanisms • Passive Transport with currents • Behaviorally mediated • Diel Vertical Migrations • Active Directional swimming
Island wake or eddie (Possible larval retention)
Long distance transport
Sampling of larval stages All methods have different size and species selectivity • Plankton nets • Bongo nets • Multiple opening nets (MOCNESS) • Seine nets • Light traps • Reef crest nets
Plankton nets: • Mostly catch small larvae
Light traps: • Species that are • attracted to light • Only catch large larvae
Crest nets: source of postsettlement fishes for aquarium and aquaculture