Evaluating the use of onboard cameras in the Shark Gillnet Fishery in South Australia
AT-SEA OBSERVERS 2.1.2.1 Data collection
Download 4.23 Mb.
|
- Navigate this page:
- Catch composition
2.1.2 AT-SEA OBSERVERS2.1.2.1 Data collectionMarine mammalsAFMA observers were placed on fishing boats fitted with an electronic monitoring system to provide an independent dataset against which to compare electronic monitoring system data. They observed 127 of the 640 shots recorded by an electronic monitoring system to collect data on interactions with protected species such as ASLs. Interactions in this case are any physical contact an individual (person, boat or gear) has with a marine mammal that causes death, injury or stress to the individual directly resulting from fishing activities. While collecting data for the trial, observers followed the standard AFMA protocol designed to maximise their ability to detect any ASL interactions. The protocol consisted of observers standing in a position where they have full view of the gillnet as it is emerging from the water in order to detect protected species caught in the nets, including individuals that fall out prior to the net coming onto the deck of the boat (Figure 7). Data such as date, shot number, time of start and end of observation, species code, life status of the individual, fate, sex, estimated weight, abundance of seal or sea lions in the area and fishing gear details are recorded in special data sheets designed to report ASL interactions. No attempt was made by the observers to record information on catch composition during most of these trips as their objective was to detect protected species interactions, particularly with ASLs. Catch compositionTo test the ability of the electronic monitoring system to accurately record catch composition, at-sea AFMA observers were asked to record catch composition from the 12 – 16 of September 2010 for a subset of 14 shots. To ensure the two data sets were independent from one another, the observer who collected data on the fishing boat was not involved in the video analysis. Both the at-sea observer and the video analyst had extensive experience; 8-9 years as at-sea observers with 2 years experience in the gillnet fishery and were familiar with the species being caught. No pre-defined list of species was utilised. The at-sea observer stood near the net roller to collect data. AFMA’s standard vessel information was recorded while catch composition data included: • shot number • species • place of removal (deck, water, roller) • method of removal (crew, self) • retained or discarded. 
Figure 7: AFMA on board observer collecting data Directory: wp-content -> uploads -> 2011 2011 -> Voices of the Old Sea Norman Lewis 2011 -> Malevil Robert Merle 2011 -> The Elephant Keeper’s Children Peter Hoeg 2011 -> Jv packet •Mars Colonization Affirmative •Mars Colonization Negative 2011 -> Registration Form (Rev. 8-86) omb no. 1024-0018 2011 -> All America Looks Up to Virginia;” Virginia and the Declaration of Independence 2011 -> Rao bulletin 2011 -> Christopher Columbus was born between 25 August and 31 October 1451 in 2011 -> The Battle of Frenchtown (1855), Washington Territory: the Political and Demographic Context rev 9/4/11 2011 -> Seti aff •seti neg •Asteroids Aff Download 4.23 Mb. Share with your friends:
|