Description

PURPOSE: Used as an abundance index for use in stock assessment. DESCRIPTION: In 2015, a spawning ground acoustic survey that follows the design of the fishery-independent acoustic survey was initiated. This survey is the result of a partnership between DFO and fishery associations. The survey design uses random parallel transects within predefined strata. Surveys are conducted by fishermen in the fall fishing season according to protocols developed by DFO. The survey is conducted at night, during the weekend fishery closures except in Herring fishing area 16C and 16E in 2015 to 2017, where this region didn’t have weekend closures. The spawning ground acoustic survey is meant to provide a nightly estimate of spawning biomass among regions. It is analyzed in the same manner as the fishery-independent acoustic survey. The catches from the experimental nets are used to calibrate the spawning group specific target strength in order to obtain the nightly estimates of spawning biomass. PARAMETERS COLLECTED: Size and age measurement (biological); acoustic tracking (ecological); species counts (ecological) SAMPLING METHODS: See references. USE LIMITATION: To ensure scientific integrity and appropriate use of the data, we would encourage you to contact the data custodian.

Resources

Name	Format	Description	Link
4T Herring Spawning Grounds Biomass Index	CSV		https://api-proxy.edh-cde.dfo-mpo.gc.ca/catalogue/records/5c79025c-5ebe-11ee-bd12-d17b9d44bf6a/attachments/fscp_index_2025.csv
Data Dictionary	CSV		https://api-proxy.edh-cde.dfo-mpo.gc.ca/catalogue/records/5c79025c-5ebe-11ee-bd12-d17b9d44bf6a/attachments/herring_spawning_data_dictionary.csv
Supplementary Citation List	PDF		https://api-proxy.edh-cde.dfo-mpo.gc.ca/catalogue/records/5c79025c-5ebe-11ee-bd12-d17b9d44bf6a/attachments/references_5c79025c_NAFO%20Fishing%20Division%204T%20.pdf

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