. Effects of three commercial harvesting methods on mussel beds. Freshwater mussels. o CD Ai CO CD CO ct: CO LU > 100 80 60 ^0 20-] * Commercial Diver does not use this target criterion CJ > LjJ CD CD (=3 CD CD h- CO o Ai CO Qi t\ Ai Od 1001 80 60 ^0 20 BAR DREDGE DIVER Figure 4. Sampling or harvest efficiency of gear. In the top graph, the target is all live mussels. In the middle graph, the target is all mussels >6 cm in height (legal criterion), and the target in the bottom graph is washboards >9 cm and three ridge and a few other species >7 cm (shell bu
. Effects of three commercial harvesting methods on mussel beds. Freshwater mussels. o CD Ai CO CD CO ct: CO LU > 100 80 60 ^0 20-] * Commercial Diver does not use this target criterion CJ > LjJ CD CD (=3 CD CD h- CO o Ai CO Qi t\ Ai Od 1001 80 60 ^0 20 BAR DREDGE DIVER Figure 4. Sampling or harvest efficiency of gear. In the top graph, the target is all live mussels. In the middle graph, the target is all mussels >6 cm in height (legal criterion), and the target in the bottom graph is washboards >9 cm and three ridge and a few other species >7 cm (shell buyers' criteria).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sparks, Richard E; Blodgett, Kevin Douglas, 1955-; Illinois. Natural History Survey Division. River Research Laboratory; Illinois. Natural History Survey Division. Aquatic Biology Section; National Great Rivers Research and Education Center - NGRREC. Havana, Ill. : Illinois Natural History Survey, River Research Laboratory
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Keywords: ., bookcentury1900, booksponsorcarlic, booksubjectfreshwatermussels
