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Table 2: Summary of knowledge gaps from discussion groups. Numbers represent the number of groups reporting that there was insufficient information available to make a judgement for a particular impediment Impediments: Superior Huron Michigan Erie Ontario a. Habitat Degradation a.a. spawning a.a. egg incubation 1 1 1 1 a.b. juvenile 1 1 1 1 a.c. adult 1 1 1 1 b. Contaminants c. Exploitation a. commercial-i. direct 1 1 1 a. commercial-ii. Bycatch b. recreationald. Non-native biota a. fish, i. piscivores 1 1 1 a. fish, ii. Planktivores a. fish, iii. Benthivores a. fish, iv. Parasites 1 b. invert., i. zooplankton 2 2 2 2 b. invert., ii. Dreissenids 1 1 c. birds cormorants e. Native biota i. piscivores 1 ii. planktivores iii. benthivores 1 1 1 1 iv. invertebrates 1 1 1 f. Genetics a. hybridization 1 1 b. diversity g. Stock structure a. age 1 1 2 2 2 b. sex-ratio 1 1 2 2 2 h. Spawning stock a. magnitude/size b. spawning site fidelity 1 2 2 2 2 i. Climate 2 1 1 1 1 14
Figure 3: Summary of knowledge gaps for lake herring in the Great Lakes. Knowledge Gaps for Impediments to Lake Herring in the Great Lakes Impediment Habitat degradation-spaw ning Habitat degradation-egg incubation Habitat degradation-juvenile Habitat degradation-adult Contaminants Exploitation-commercial-direct Exploitation-commercial-bycatch Exploitation-recreational Non-native-fish-piscivores Non-native-fish-planktivores Non-native-fish-benthivores Non-native-fish-parasites Non-native-invertebrates-zooplankton Dreissenids Cormorants Native piscivores Native planktivores Native benthivores Native invertebrates Hybridization Loss of diversity Age distribution Sex-ratio Size and number of spaw ning stocks Spaw ning site fidelity Climate Score (15=total lack of knowledge) 0 2 4 6 8 10 15
Page 1 and 2: GREAT LAKES FISHERY COMMISSION 2004
Page 3 and 4: Status and Assessment, Research, an
Page 5 and 6: Executive Summary The Great Lakes R
Page 7 and 8: Introduction The lake herring (Core
Page 9 and 10: Table 1: Potential Impediments to L
Page 11 and 12: Based on index netting, lake herrin
Page 13 and 14: Table 1: Summary of impediment rank
Page 15: Summary of Knowledge Gaps for Lake
Page 19 and 20: 2/27/2004 Alewives and to a lesser
Page 21 and 22: 2/27/2004 Summary of Restoration Ne
Page 23 and 24: 2/27/2004 References Bence, J. R. a
Page 25 and 26: 2/27/2004 Appendix A Agenda Lake He
Page 27 and 28: 2/27/2004 Appendix B Participant Li
Page 29 and 30: 2/27/2004 Appendix C Summary of Sta
Page 31 and 32: 2/27/2004 Explanatory notes for imp
Page 33 and 34: 2/27/2004 Research Questions for Gr
Page 35 and 36: 2/27/2004 Appendix E Summary of Dis
Page 37 and 38: 2/27/2004 e. Native biota • Pisci
Page 39 and 40: 2/27/2004 Final Charge 2 for Group
Page 41 and 42: 2/27/2004 Explanatory notes for Gro
Page 43 and 44: 2/27/2004 Final Charge 1 for Group
Page 45 and 46: 2/27/2004 Issue: What are the early

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