Seasonal length:weight relationships of grenadiers, chimaeras and Atlantic herring caught by Fisheries and Oceans Canada Maritimes Region ecosystem surveys using different measurement techniques at-sea... : Fs97-13/1291E-PDF

"Fisheries and Oceans Canada Maritimes Region has conducted annual ecosystem surveys of the Scotian Shelf, Bay of Fundy and Georges Bank since 1970. These surveys are the primary data source for monitoring trends in fish and invertebrate species distribution, abundance, and biological condition in the Maritimes Region. Since 2014, all catch and biological data are entered at sea using the Ecosystem Survey Entry software system, which was developed to aid in the automation of the data entry process. An error message is generated during data entry if the observed weight of a specimen at-length differs from the predicted weight-at-length by more than 25%. This is intended to reduce data entry errors due to typographic errors, incorrect measurement and/or units used. Fish species Length:Weight Relationships (LWR) are an important tool to aid in data collection quality control at sea. We use regression coefficients, intercept (a) and slope (b), calculated from previous years seasonal surveys to predict the weight from the length of a fish. This report examines fish species that have been measured differently throughout the time period (2001-2014 or 2001-2017 for deep water species) and estimates (LWR) coefficients for the differing methods. Moving forward, Atlantic Herring will be measured by total length in millimeter. Grenadier and Chimaera species will be measured using pre-anal fin length to the nearest millimeter"--Abstract, page iv.

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