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Plankton
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Definition…
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Diatoms
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Green Algae: Chlorophytes
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Zooplankton
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Cladocera Daphnia, water flea
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Bosmina Leptodora
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Copepods Calanoid Harpracticoid Cyclopoid
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Copepod Nauplius
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Rotifers
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Plankton Nets
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Net Size Classifications
Freshwater Plankton Classifications with Bolting Cloth Sizes µm size Inch size Silk size Plankton Classification 1,000 0.0394 000 XX Largest zooplankton & ichthyoplankton 750 0.0295 00 XX Larger zooplankton & ichthyoplankton 600 0.0236 ----- Large zooplankton & ichthyoplankton 560 0.0220 0 XX Medium zooplankton & ichthyoplankton 363 0.0143 2 Large microcrustacea 243 0.0096 6 Microcrustacea 153 0.0060 10 Microcrustacea & most rotifers 118 0.0046 12 No definition 80 0.0031 20 Net phytoplankton & Net zooplankton 63 0.0024 25 Large nannoplankton 0.0004 none Small nannoplankton
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Plankton Size Cagetgories
Group Size range Megaplankton > 2×10−2 m (20+ mm) metazoans; e.g. jellyfish; ctenophores; salps and pyrosomes (pelagic Tunicata); Cephalopoda Macroplankton 2×10−3→2×10−2 m (2–20 mm) metazoans; e.g. Pteropods; Chaetognaths; Euphausiacea (krill); Medusae; ctenophores; salps, doliolids and pyrosomes (pelagic Tunicata); Cephalopoda Mesoplankton 2×10−4→2×10−3 m (0.2 mm-2 mm) metazoans; e.g. copepods; Medusae; Cladocera; Ostracoda; Chaetognaths; Pteropods; Tunicata; Heteropoda Microplankton 2×10−5→2×10−4 m ( µm) large eukaryotic protists; most phytoplankton; Protozoa (Foraminifera); ciliates; Rotifera; juvenile metazoans - Crustacea (copepod nauplii) Nanoplankton 2×10−6→2×10−5 m (2-20 µm) small eukaryotic protists; Small Diatoms; Small Flagellates; Pyrrophyta; Chrysophyta; Chlorophyta; Xanthophyta Picoplankton 2×10−7→2×10−6 m (0.2-2 µm) small eukaryotic protists; bacteria; Chrysophyta Femtoplankton < 2×10−7 m (< 0.2 µm) marine viruses
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