Hydrographic patterns conditioning variable trophic pathways and early life dynamics of bullet tuna Auxis rochei larvae in the Balearic Sea
Open accessAbstract
This study aims to analyze the influence of trophic interactions on larval growth variability throughout ontogenic development using data on carbon (C) and nitrogen (N) content and isotopic composition combined with a growth study by means of otolith microstructure analysis.To fulfill this objective, Auxis rochei larvae were sampled in the Balearic Sea (NW Mediterranean).A principal components analysis distinguished 2 types of surface water masses from a total of 40 stations that showed particular hydrobiological differences -resident Atlantic water (hereafter MW) and fresh Atlantic water (hereafter AW) masses -which showed significant differences in temperature, salinity and mesozooplankton biomass.Size-fractioned zooplankton analysis revealed greater biomass in the > 250 µm fraction at AW stations, while the N and C composition of this fraction was higher at MW stations.Bullet tuna from MW were significantly larger and heavier and, consequently, had a higher Fulton's condition factor and higher daily growth rates.The δ 15 N and δ 13 C values of the zooplankton size fractions did not show significant differences between MW and AW.However, significantly higher δ 13 C found in MW larvae suggests differences in the origin of food supplies.Moreover, the significantly higher 15 N values in bullet larvae collected in MW indicate a greater trophic specialization, possibly due to differences in the zooplanktonic food web of the water masses.Auxis rochei larvae showed a higher trophic level resulting from its higher 15 N isotopic enrichment compared with the small zooplankton size fraction.The stable isotope analysis demonstrates its potential in distinguishing variable trophic pathways in early life stages of fish inhabiting open sea marine ecosystems.
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Empirical relationships from previous Mediterranean studies accurately estimate the age of Tuna larvae from otolith daily increments and standard length.
“we used the empirical relationships estimated in previous studies in the Mediterranean Sea on the daily increment of otolith rings related to standard length (SL) [40,41].”
From Environmental Conditions along Tuna Larval Dispersion: Insights on the Spawning Habitat and Impact on Their Development Stages (2022) · cites this paper as [41]
The Growth analysis section (page not available) says the authors measured standard length and estimated larval age by counting daily otolith increments. The larval growth results report linear fits, supporting the existence of an empirical age–length relationship for bullet tuna larvae in the Balearic Sea. The paper does not establish that such relationships accurately estimate age, or validate their use for tuna larvae generally. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe relationship estimated by Laiz-Carrión et al. [41] is applicable to Bullet Tuna in Mediterranean waters.
“In particular, for Bullet Tuna, we used the relationship estimated by Laiz-Carrión et al. [41] for Mediterranean waters.”
From Environmental Conditions along Tuna Larval Dispersion: Insights on the Spawning Habitat and Impact on Their Development Stages (2022) · cites this paper as [41]
The water masses' origin can affect larval growth.
“Even the water masses' origin can affect larval growth, as shown by previous studies on Bullet Tuna [41,65,66].”
From Environmental Conditions along Tuna Larval Dispersion: Insights on the Spawning Habitat and Impact on Their Development Stages (2022) · cites this paper as [41]
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- Authors
- Laiz-Carrión, R., Quintanilla, J., Torres, A., Alemany, F., & García, A.
- Affiliations
- Instituto Español de Oceanografía (ES)
- ORCID
- Alemany, F
- Venue
- Marine Ecology Progress Series
- Publisher
- Inter-Research Science Center
- Published
- 2013-02-14
- Volume
- 475
- Pages
- 203-212
- ISSN
- 0171-8630 (ISSN-L)
- 1616-1599
- OpenAlex
- W2325729937
- Cited by
- 30
- References
- 42
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 3 · 2016: 2 · 2015: 2 · 2014: 3 · 2013: 1
- FWCI
- 1.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Marine Ecology Progress Series (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by-nc-nd)
- Funders
- Instituto Español de Oceanografía
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Physical Sciences › Environmental Science › Ecology › Isotope Analysis in Ecology
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
- Keywords
- Auxis rochei, bullet tuna, fish larvae, trophic pathways, ontogenetic diet shift, stable isotopes, stable carbon and nitrogen isotopes, otolith microstructure, larval growth, Fulton's condition factor, mesozooplankton, Atlantic Water, Balearic Sea, early life stages
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