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Recruitment Patterns and Environmental Sensitivity of Glass Eels of in the Yangtze Estuary, China. | LitMetric

Recruitment Patterns and Environmental Sensitivity of Glass Eels of in the Yangtze Estuary, China.

Biology (Basel)

Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China.

Published: January 2024

AI Article Synopsis

  • - The study reveals that Japanese eel populations in the Yangtze River estuary have been declining, with daily catch data from 2012-2022 showing a wide variation in glass eel arrivals and a concerning trend of delayed recruitment since 2016.
  • - The research links eel catch abundance to factors like water temperature and lunar cycles, predicting an increase in glass eel numbers for 2023-2024, while indicating that rising sea temperatures are negatively impacting their body weight and migration.
  • - This underscores the urgent need for conservation efforts and detailed monitoring to combat the adverse effects of climate change on eels, which are essential for the river's ecological health.

Article Abstract

The decline of Japanese eel () populations in the Yangtze River estuary represents a critical conservation concern. Eleven-years of daily catch data during recruitment periods (i.e., January-April, 2012-2022) indicate that annual catch averaged from 153 to 1108 eels, and show a bimodal pattern in glass eel arrivals. Utilizing seasonal-trend decomposition and generalized additive models, we demonstrated a strong correlation between catch abundance, optimal water temperatures, and lunar cycles. An auto-regressive integrated moving average (ARIMA) model predicts an increase in glass eel numbers for 2023-2024 but also points to a concerning trend of delayed recruitment timing since 2016, attributable to the 0.48 °C per decade rise in sea surface temperatures. This delay correlates with a significant decrease in the average body weight of glass eels, suggesting potential energy deficits that may hinder successful upstream migration. This study not only furthers our understanding of glass eel recruitment dynamics but also underscores the urgent need for targeted conservation measures. Additionally, it highlights the importance of sustained, detailed monitoring to mitigate the detrimental effects of climate change on these eels, vital for preserving the Yangtze River's ecological integrity.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10813113PMC
http://dx.doi.org/10.3390/biology13010056DOI Listing

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