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| | Nat'l Ballast Clearinghouse |
 | | We expect to estimate rates of ballast water exchange, both in terms of the frequency of vessels that undergo exchange and the percentage of ballast water exchanged, for different vessel types (e.g., bulk carriers, oil tankers, container ships, etc.). |
 | | Ballast water is carried by ships to provide stability and adjust a vessel's trim for optimal steering and propulsion. |
 | | NISA issued mandatory ballast management reporting and voluntary ballast exchange guidelines to all vessels that enter U.S. waters from outside the EEZ, with the exception military vessels, crude oil tankers that carry out coastwise trade, and some passenger ships that are equipped with ballast treatment systems. |
| www.hrw.com /science/si-science/biology/animals/marineinvasions/ballast.html (1419 words) |
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