Field Guide to the Fishes of the Amazon, Orinoco, and Guianas (Princeton Field Guides) 2007 The GRS Densitometer™ is used

The GRS Densitometer™ is used to estimate canopy cover and abundance within an individual sample area along a transect

Further upgrades to a trusted classic

4 Weight (lb) 3 3 4 4 5 5 6 7 8 Weight (kg) 1

when used with either line-point or line-intercept transect sampling

Field Guide to the Fishes of the Amazon, Orinoco, and Guianas (Princeton Field Guides) 2007 The GRS Densitometer™ is usedThe Amazon and Orinoco basins in northern South America are home to the highest concentration of freshwater fish species on earth, with more than 3,000 species allotted to 564 genera. Amazonian fishes include piranhas, electric eels, freshwater stingrays, a myriad of beautiful small bodied tetras and catfishes, and the largest scaled freshwater fish in the world, the pirarucu. Field Guide to the Fishes of the Amazon, Orinoco, and Guianas provides