Design and application of vacuum degassers

Designs of vacuum degassers, which alleviate gas supersaturation in hatchery waters, have progressed greatly in recent years. Basic rules of thumb now exist by which the feasibility of vacuum degassers can be determined for particular facilities, and by which complete systems can be designed and built to meet local needs. These rules are presented in the form of step‐by‐step procedures and guidelines directed to practicing hatchery operators. The flexibility of vacuum degasser designs is illustrated for large‐, medium‐, and small‐volume systems.