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<br />1.1 <br /> <br />1. Area relative to lake area and <br />number of marshes per lake. <br />2. Depth--marsh morphometry. <br />3. Proximity to receiving lake. <br />4. Degree of shelter necessary <br />including axis of marsh rela- <br />tive to prevailing wind. <br />5. Water supply source--diverted <br />stream, direct runoff, pumped <br />from lake or stream. <br />6. Water quality--pollutants. <br />7. Marsh watershed--potential <br />for excessive siltation. <br />8. Drainable or not, and if <br />drainable, should bottom be <br />dry or swampy. <br />9. Low iron content. <br />10. Suitability for structural <br />control of water levels, <br />immigration and emigration <br />of adults and trapping of <br />fingerlings. <br />11. Stability of water level to <br />avoid exposure of eggs and <br />crowding of fry and <br />fingerlings. <br /> <br />1.1 <br /> <br />1. Should young of the year be <br />allowed to emigrate to the lake <br />at will? <br />2. Considering cannibalism, marsh <br />food supply, fingerling size, <br />physico-chemical conditions in <br />the marsh and conditions in the <br />receiving lake system, when <br />is the best time for fingerling <br />harvest if controlled? <br />3. Should marsh be drained and <br />young of the year flushed to the <br />lake without handling? <br />4. Should young of the year be <br />trapped and distributed in <br />receiving lake? <br /> <br />2) <br /> <br />1. Should adult spawners be used? <br />a. Should free access by <br />spawners be allowed? <br />b. Should selected numbers, <br />sizes, and sex ratios of <br />spawners be stocked? <br />c. Should adults be removed <br />after spawning? <br />d. What should be the source <br />of' the spawners? <br />2. Should marshes be used for <br />rearing only? <br />a. Should fertilized eggs or <br />fry be stocked? <br />b. If fry, what age should be <br />stocked? <br />c. If eggs or fry, what should <br />be the stocking density? <br />d. If eggs or fry, what should <br />be the manner of introduction? <br /> <br />!il <br /> <br />1. Should water be left in the <br />marsh year around? <br />2. Should the marsh be left <br />drained after fingerling removal? <br />a. If drained, when should it <br />be flooded for spawning or <br />rearing use? <br />b. Should the dry marsh bottom <br />be fallowed? <br />c. Should the dry marsh bottom <br />be plowed, disked and seeded? <br />3. Should marshes be fertilized? <br />4. What type of vegetation is <br />most desirable? <br />a. If marsh is left flooded, <br />should vegetation control <br />be instituted? <br />b. If marshes are drained, what <br />type vegetation will provide <br />the best spawning substrate? <br />5. Considering potential for problems <br />from NH~, C02, H2S, CH4, and <br />low 02, how should fresh water <br />supply and organic budget be <br />manipulated? <br /> <br />10 <br />