NAca Section 2.pmd - Maryland Department of Natural Resources
NAca Section 2.pmd - Maryland Department of Natural Resources
NAca Section 2.pmd - Maryland Department of Natural Resources
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Table 2. DIAS statistics by year <strong>of</strong> introduction (from FAO 1998).<br />
Year No. <strong>of</strong> Records %<br />
Before 1800 47 1.5<br />
1800-1899 136 4.3<br />
1900-1939 314 10.0<br />
1940-1979 1114 35.5<br />
1980-1998 603 19.2<br />
Multiple introductionsin<br />
different periods 90 2.8<br />
Unknown 837 26.6<br />
Table 3. Statistics by species group (from FAO 1998).<br />
Group <strong>of</strong> Species No. <strong>of</strong> Records %<br />
Fishes 2574 81.9<br />
Molluscs 294 9.4<br />
Crustaceans 191 6.0<br />
Algae and plants 35 1.1<br />
Other invertebrates 29 0.9<br />
Other vertebrates 18 0.6<br />
Table 4. Most frequently introduced fish, crustaceans and molluscs<br />
(modified from FAO 1998).<br />
Scientific Name Common Name No. <strong>of</strong> Records<br />
Fish<br />
Cyprinus carpio Common carp 124<br />
Oncorhynchus mykiss Rainbow trout 99<br />
Oreochromis mossambicus Mozambique tilapia 92<br />
Ctenopharyngodon idella Grass carp 91<br />
Oreochromis niloticus Nile tilapia 80<br />
Hypophthalmichthys molitrix Silver carp 79<br />
Gambusia affinis Mosquit<strong>of</strong>ish 67<br />
Micropterus salmoides Largemouth black bass 64<br />
Hypophthalmichthys nobilis Bighead carp 55<br />
Carassius auratus Goldfish 54<br />
Crustaceans<br />
Macrobrachium rosenbergii Giant river prawn 43<br />
Procambarus clarkii Red swamp crawfish 24<br />
Penaeus monodon Giant tiger prawn 13<br />
Penaeus japonicus Kuruma prawn 12<br />
Pacifastacus leniusculus Whiteleg prawn 11<br />
Molluscs<br />
Crassostrea gigas Pacific cupped oyster 45<br />
Trochus niloticus Top shell 16<br />
Crepidula fornicata American slipper-limpet 12<br />
Pomacea canaliculata Golden apple snail 11<br />
Tridacna derasa Smooth giant clam 11<br />
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