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Groundfish Assessment Program

Groundfish Program Manuals

 

 

Bottom Trawl Survey Protocols

Click to open NOAA Protocols For Groundfish Bottom Trawl Surveys, PDF file
Click image to open .PDF file

 

 

Safety Manual

The staff of the RACE Groundfish Assessment Program conducts fieldwork in a potentially dangerous environment: on small vessels floating in a very cold ocean. This At-Sea Safety Manual, developed by the RACE/REFM At Sea Safety Committee, identifies unsafe situations and practices that we face in our everyday field activities. Rules and strategies have been devised to minimize the dangers they present. 

Click to open At Sea Safety Manual, PDF file
Click image to open .PDF file *Draft*

 

 

Groundfish Survey Codes

We maintain and annually update the Groundfish Survey Codebook which is a list of the codified survey operations, standards, and units of measure that serve as domain values in the Groundfish Program database.

Groundfish Survey Codes, PDF file

Click image to open .PDF file

 

 

Groundfish Species Codes

We maintain and annually update the Groundfish Species Codebook which lists the names/codes of fish and invertebrates identified on the bottom trawl surveys and serve as domain values in the Groundfish Program database. It is not a comprehensive list of all taxa potentially available to the surveys nor a hierarchical taxonomic key.

Click to open Species Code Book, PDF file

Click image to open .PDF file

 

 

Species Identification Confidence

The quality and specificity of field identifications for many taxa have fluctuated over the history of the surveys due to changing priorities and resources. Historical trends in identification quality for each of the major Alaska Fisheries Science Center bottom trawl surveys was documented. These reports include identification confidence matrices for all fishes and invertebrates identified from respective surveys.

Click to open EBS Shelf Species ID Confidence Guide, 	PDF file EBS Slope Species ID Confidence Guide, 	PDF file AI/GOA Species ID Confidence Guide, 	PDF file

Click image to open .PDF file

 

 

Species Identification Confidence

There are multiple sources of variability in the sampling efficiency of the trawl gear used for the survey, both species- and size-specific, that may affect inferences about the nature of the overall catches and relative animal densities. Furthermore, the quality and specificity of catch quantification (weighing and counting) at sea of many taxa can vary depending on the overall size of the catch and the species composition of the sample, particularly for non-commercial taxa of small size. This document is an assessment of the relative reliability of survey catch weights, numbers, and catch per unit effort estimates derived from the eastern Bering Sea shelf bottom trawl survey and is intended to serve as a guideline for researchers interested in using the survey data and results. Included within is a confidence matrix of sampling efficiency and catch quantification for all fishes and invertebrates identified during the shelf survey

Click to open EBS Shelf Estimating Confidence in Trawl Efficiency and Catch Quantification Guide, 	PDF file

Click image to open .PDF file

 

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