What is a Marine Mammal Observer (MMO) and Passive Acoustic Monitoring  (PAM) Operator?

Projects requiring Marine Mammal Observers (MMOs) and Passive Acoustic Monitoring (PAM) Operators have arisen due to concerns regarding the levels of man-made noise in the ocean and how this may affect marine life, in particular, marine mammals and turtles.

The four main operations at sea that are causing concern are:

• Seismic Surveys - looking for new oil and gas reserves

• Explosives - used in the decommissioning of oil platforms and structures

• Pile Driving for Construction – for example wind farm construction, tidal turbine and new piers

• Military Sonar used to detect submarines

The governing body in the United Kingdom responsible for implementing mitigation measures to protect marine mammals during offshore operations within the UK continental shelf is the Joint Nature Conservation Committee (JNCC).  Persons employed as MMOs and PAM operators in UK continental shelf waters must first undertake a training course recognised by the JNCC.
 

The Role of the MMO and PAM Operator

The role of the MMO and PAM operator is to be present on the ships during offshore operations and to act immediately to protect marine mammals should they enter an exclusion  zone (usually 500 metres) prior to operations. MMOs will advise personnel onboard to delay operations until the animals are at a safe distance and also to record behaviour and sightings at other times.

The observer must first be able to detect marine mammals. This is done by visual and passive acoustic monitoring. Visual monitoring is conducted by using the highest platform with the best all-round vision and using simply a pair of binoculars the MMO scans the surrounding areas for animals. Visual monitoring is done in all observation work. In addition passive acoustic monitoring may also be carried out. Marine mammals spend most of their time underwater and for those species who are very vocal and are deep divers such as sperm whales  –  acoustic monitoring can be conducted in addition to visual monitoring to increase the likelihood of detection. Acoustic monitoring also allows for the MMO to detect animals at night. Passive Acoustic Monitoring is conducted by deploying hydrophone cables and monitoring in-coming signals on computers with specially designed acoustic software.