Publication Date:
2023-02-12
Description:
We combined longitudinal analyses of otolith microstructure and trace elemental composition in ~ age 1-2 Pacific bluefin tuna (PBT, n = 24) for inferring the arrival of individuals in the California Current Large Marine Ecosystem (CCLME). Element:Ca ratios in transverse otolith sections (9-12 rows, triplicate ablations from coreprimordium to edge, ø50 µm) were quantified for eight elements: Li, Mg, Mn, Co, Cu, Zn, Sr, and Ba, which was followed by microstructure analysis to provide age estimates corresponding to each ablation spot. Age estimates from otoliths ranged from 328 to 498 days post hatch. The combined elemental signatures of four elements (Ba, Mg, Co, Cu) showed a significant increase at the otolith edge in approximately half of the individuals (30-60 days prior to catch). Given the different oceanographic properties of oligotrophic open Pacific vs. high nutrient, upwelling CCLME waters, this signal is consistent with the entry of the fish into the CCLME, which was estimated to occur primarily in July after a transoceanic migration of ~1.5-2.0 months.
Keywords:
Age; Barium; Calcium; California_current; California Current; Cobalt; Copper; Date; DATE/TIME; Distance; Fish, curved fork length; Identification; Inductively coupled plasma - mass spectrometry (ICP-MS); Lithium; Location; Magnesium; Manganese; Net; NET; Number; Observation; Otolith, Barium/Calcium ratio; Otolith, Cobalt/Calcium ratio; Otolith, Copper/Calcium ratio; Otolith, Lithium/Calcium ratio; Otolith, Magnesium/Calcium ratio; Otolith, Manganese/Calcium ratio; Otolith, Strontium/Calcium ratio; Otolith, Zinc/Calcium ratio; Ratio; Replicate; Species; Strontium; Time in days; Zinc
Type:
Dataset
Format:
text/tab-separated-values, 33920 data points
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