The application of otolith chemistry in fish life history assessment: review
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Understanding the movement and life-history characteristics of marine organisms is vital for effective management and conservation efforts, yet there are still significant knowledge gaps in this field. Understanding how specific nursery habitats shape juvenile behavior and growth, as well as how connectivity influences population dynamics and stock structure, is essential for developing such strategies. Chemical analysis of fish otoliths provides valuable insights into these processes. Otoliths incorporate and store elements from the surrounding environment throughout the fish’s life, with their composition reflecting ambient environmental conditions. Elements such as Ba/Ca, Mg/Ca, U/Ca, B/Ca, and Sr/Ca in otoliths show strong correlations with ocean water temperatures and are used to determine population structure, identify estuarine nurseries, and assess connectivity between juvenile and adult populations. Elements like strontium and barium are particularly useful for reconstructing environmental and migration histories for individual fish, as their concentrations reflect local seawater availability. The elemental ratios of otoliths exhibit differences as fish move through different aquatic environments, with higher Sr/Ca ratios found in marine waters and higher Ba/Ca ratios in freshwater. Additionally, there’s a positive relationship between otolith Sr content and ambient salinity, although the extent of this relationship depends on water Sr concentrations. Other elements like K, Na, Zn, and Mn are likely influenced by physiological regulation in organisms. Stable isotope analysis of both soft tissues and otoliths provides further insights into the biotic environment, reflecting fish diet and aiding in determining movement within estuaries, migratory patterns, and habitat use.
Abstract
Understanding the movement and life-history characteristics of marine organisms is vital for effective management and conservation efforts, yet there are still significant knowledge gaps in this field. Understanding how specific nursery habitats shape juvenile behavior and growth, as well as how connectivity influences population dynamics and stock structure, is essential for developing such strategies. Chemical analysis of fish otoliths provides valuable insights into these processes. Otoliths incorporate and store elements from the surrounding environment throughout the fish’s life, with their composition reflecting ambient environmental conditions. Elements such as Ba/Ca, Mg/Ca, U/Ca, B/Ca, and Sr/Ca in otoliths show strong correlations with ocean water temperatures and are used to determine population structure, identify estuarine nurseries, and assess connectivity between juvenile and adult populations. Elements like strontium and barium are particularly useful for reconstructing environmental and migration histories for individual fish, as their concentrations reflect local seawater availability. The elemental ratios of otoliths exhibit differences as fish move through different aquatic environments, with higher Sr/Ca ratios found in marine waters and higher Ba/Ca ratios in freshwater. Additionally, there’s a positive relationship between otolith Sr content and ambient salinity, although the extent of this relationship depends on water Sr concentrations. Other elements like K, Na, Zn, and Mn are likely influenced by physiological regulation in organisms. Stable isotope analysis of both soft tissues and otoliths provides further insights into the biotic environment, reflecting fish diet and aiding in determining movement within estuaries, migratory patterns, and habitat use.