TY - JOUR
T1 - Intra- and inter-annual variability in the fat content of Atlantic herring (Clupea harengus) as revealed by routine industry monitoring
AU - Kenyon, Susan Elaine
AU - Pastoors, Martin
AU - Mackinson, Steven
AU - Cornulier, Thomas
AU - Marshall, C. Tara
N1 - This study was completed as part of a PhD studentship co-funded by the University of Aberdeen, the Pelagic Freezer-Trawler Association, and the Scottish Pelagic Fishermen’s Association. The authors would also like to thank Lunar Freezing and Cold Storage Ltd, Denholm Seafoods Ltd, Parlevliet and van der Plas BV, Cornelis Vrolijk BV, and WvanderZwan BV for collecting and providing data to use in this study. Additionally, we thank three anonymous reviewers for their constructive feedback on an earlier version of the manuscript.
PY - 2022/1
Y1 - 2022/1
N2 - Fat content indicates individual condition and fuels annual reproductive cycles in many fish species. These cycles, coupled with ecosystem changes, can result in large intra- and inter-annual fluctuations in fat content. However, quantifying this variability is challenging when scientific sampling does not cover the full reproductive cycle. Scottish and Dutch fish processors routinely measure muscle fat content of North Sea autumn-spawning herring (Clupea harengus) throughout fishing seasons. We validated these high temporal resolution data by estimating a strong intra-annual signal in fat content, which matched herring reproductive status. Fat content increased from 4.5% 95% CI [0.03, 0.06] to 16.1% 95% CI [0.15, 0.17] during May and June before plateauing and decreasing to 9.1% 95% CI [0.08, 0.10] in September, which coincided with the onset of spawning. We also examined inter-annual variability in the seasonal pattern and the timing and magnitude of peak fat content from 2006 to 2020. Inter-annually, fat content differed from the mean pattern during the feeding or spawning periods in years 2013, 2015–2017, 2019, and 2020. There was no difference in the timing and magnitude of peak fat content between years. Our study validates the scientific use of routinely collected fat content data from pelagic fish processors.
AB - Fat content indicates individual condition and fuels annual reproductive cycles in many fish species. These cycles, coupled with ecosystem changes, can result in large intra- and inter-annual fluctuations in fat content. However, quantifying this variability is challenging when scientific sampling does not cover the full reproductive cycle. Scottish and Dutch fish processors routinely measure muscle fat content of North Sea autumn-spawning herring (Clupea harengus) throughout fishing seasons. We validated these high temporal resolution data by estimating a strong intra-annual signal in fat content, which matched herring reproductive status. Fat content increased from 4.5% 95% CI [0.03, 0.06] to 16.1% 95% CI [0.15, 0.17] during May and June before plateauing and decreasing to 9.1% 95% CI [0.08, 0.10] in September, which coincided with the onset of spawning. We also examined inter-annual variability in the seasonal pattern and the timing and magnitude of peak fat content from 2006 to 2020. Inter-annually, fat content differed from the mean pattern during the feeding or spawning periods in years 2013, 2015–2017, 2019, and 2020. There was no difference in the timing and magnitude of peak fat content between years. Our study validates the scientific use of routinely collected fat content data from pelagic fish processors.
U2 - 10.1093/icesjms/fsab244
DO - 10.1093/icesjms/fsab244
M3 - Article
SN - 1054-3139
VL - 79
SP - 88
EP - 99
JO - ICES Journal of Marine Science
JF - ICES Journal of Marine Science
IS - 1
ER -