Evaluation of Potential Fishing Location Bias when an Observer is Aboard a Hawaii Deep-set Longline Trip

The objective of the study discussed in this report was to evaluate if there is evidence that crews on deep-set longline vessels are less likely to fish within the U.S. Exclusive Economic Zone (EEZ) around Hawaii when a National Oceanic and Atmospheric Administration (NOAA)observer is aboard. There is particular concern about this behavior since the False Killer Whale Take Reduction Plan (FKWTRP) Final Rule went into effect on December 31, 2012 (77 FR71260). This technical memorandum and the results presented were completed in March 2018. 

Under the FKWTRP, NOAA Fisheries will close the Southern Exclusion Zone (SEZ) to deep-setting after the deep-set fishery reaches a “trigger” based on the false killer whale’s potential biological removal level.  The FKWTRP defines the SEZ as bounded by 165°00′W longitude on the west, 154°30′W longitude on the east, the Papahānaumokuākea Marine National Monument and the main Hawaiian Islands Longline Fishing Prohibited Area on the north, and the U.S. Exclusive Economic Zone boundary on the south.  The trigger is currently defined as two observed false killer whale interactions in the deep-set fishery that occurred within the EEZ around Hawaii and which NOAA Fisheries has determined are deaths or serious injuries.  If the trigger is met, the SEZ will be closed to deep-setting for the rest of the calendar year and will be reopened at the beginning of the next calendar year. In the next calendar year, one of two things can happen: (1) if the trigger is not reached, the SEZ will remain open all year, or (2) if the trigger is reached, NOAA Fisheries will close the SEZ to deep-setting until certain bycatch reduction criteria have been met. This may mean the area is closed for longer than the calendar year.

McCracken ML. 2019. Evaluation of Potential Fishing Location Bias when an Observer is Aboard a Hawaii Deep-set Longline Trip. U.S. Dept. of Commerce, NOAA Technical Memorandum NOAA-TM-NMFS-PIFSC-84. 17 p.  https://doi.org/10.25923/e7qn-6x46.