What is a Fish?

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Early Life History
Fish Life Cycle Terminology Larval
adaptations Fish Larvae Science
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Fish Life Cycle
Spawning
Adults
Eggs
ADULT Environment
PELAGIC Environment
Juveniles
Larvae
Settlement
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Larval Development Stages
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(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.
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Gadidae Gadus morhua
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Molidae Mola mola
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Pelagic larvae adaptations
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Piscivorous larvae
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Leptocephali larvae
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Metamorphosis
Bothidae Bothus ocellatus
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Engraulis encrasicolus
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Fish Life Cycle
Spawning
Adults
Eggs
ADULT Environment
PELAGIC Environment
Juveniles
Larvae
Settlement
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End of larval phase

• Settlement
• Metamorphosis
• Recruitment
• Colonization

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Post-flexion
Epinephelus morio
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Larval Transport Mechanisms

• Passive Transport with currents
• Behaviorally mediated
• Diel Vertical Migrations
• Active Directional swimming

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Island wake or eddie (Possible larval retention)
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Long distance transport
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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

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• Plankton nets
• Mostly catch small larvae

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• Light traps
• Species that are
• attracted to light
• Only catch large larvae

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Crest nets source of postsettlement fishes for
aquarium and aquaculture