A field guide to the mammals : field marks of all species found North of the Mexican boundary
1964
Burt, William Henry |
Grossenheider, Richard Philip |
National Audubon Society, US
Guide to the national wildlife refuges
1992
Riley, Laura |
Riley, William |
Ecosystem analysis of the Usumacinta Delta, Tabasco and Campeche, Mexico 1978-1981
1978
Duever, Michael J. |
Sprunt, Alexander |
Les requins et autres poissons cartilagineux : écologie et conservation
2004
Bräutigam, Amie |
Camhi, Merry |
Fordham, Sonja V. |
Fowler, Sarah |
Musick, John |
Sharks and their relatives, the rays and chimaeras, are the diverse group of cartilaginous fishes that have evolved over 400 million years. Historically considered of low economic value to large-scale fisheries, today many of these fishes have become the target of directed commercial and recreational fisheries around the world, and they are increasingly taken in the by-catch of fisheries targeting other species.
Sharks and their relatives : ecology and conservation
1998
Bräutigam, Amie |
Camhi, Merry |
Fordham, Sonja V. |
Fowler, Sarah |
Musick, John |
Sharks and their relatives, the rays and chimaeras, are the diverse group of cartilaginous fishes that have evolved over 400 million years. Historically considered of low economic value to large-scale fisheries, today many of these fishes have become the target of directed commercial and recreational fisheries around the world, and they are increasingly taken in the by-catch of fisheries targeting other species.