Fumigation will effectively destroy rodent populations in their burrows ant other hiding places. Where the fumigation can be confined, this method of control will also kill ectoparasites infesting the rodents. Fumigation for rodent control using hydrogen phosphide or other products should be conducted only by appropriately trained personnel. Foreign quarantine regulations require that rat guards be used by naval vessels when berthing in ports where plague is endemic to prevent introduction of rodents on the ship. Specific Atlantic and Pacific Fleet instructions apply.
Rodents are basically nocturnal.
Therefore, gangways and landing ramps shall be well lighted at night to discourage rodent movement aboard. Cargo nets are similar devices extending between the vessel and shore must be raised or removed when not in actual use. Inspections of all subsistence items and cargo for rodent signs, such as droppings, hair, gnawing or live rodents are essential in attempting to maintain a rodent free ship. The elimination of food and shelter through proper handling of food and prompt disposal of garbage and rubbish will reduce the attractiveness of the ship to rodents. Because of the odor from dead rats in confined spaces of a ship, glue boards are the method of choice for small infestations.