Cited by 73Marine and fisheries researchFish Biology and Ecology StudiesAquaculture Nutrition and Growth

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

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Morote, E, Olivar, MP, Pankhurst, PM, Villate, F, Uriarte, I·2008·Marine Ecology Progress Series

Abstract

The bullet tuna Auxis rochei, Risso 1810, is a small tuna widely distributed in tropical and temperate Seas.The present study reports on the first attempt to jointly monitor diet and food selection in larvae of this species and to assess the influence of the ontogenetic development of feeding-related organs on the diet.A. rochei larvae from 2 to 7 mm long are diurnal feeders and highly active predators, with high values of feeding incidence, gut fullness and number of ingested prey items.The rate of change in prey item size in relation to larval size was higher than in other species.Only small, non-motile prey items are eaten at the onset of feeding.Rapid mouth development and the early appearance of teeth allow larvae from 3 to 5 mm long to ingest a wide range of prey.However, niche breadth decreases at 5 mm, when larvae avoid small prey items in favour of larger ones with a higher carbon content.Chesson's selectivity index indicated that small larvae (from 2 to 3 mm long) selected a variety of small prey items, mainly copepod nauplii.Larvae measuring 3 to 5 mm selectively ate cladocerans and appendicularians, and larvae with lengths ≥5 mm preferred appendicularians and fish larvae.Precocious body development (mouth, teeth, and onset of stomach and caudal fin development) and improved visual acuity (larger lens diameter and angular cone density) are factors that contribute to the feeding success of larvae of this species.

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  • All members of the Scombridae family have an exceptionally fast development of the digestive and visual sensory systems, developmental traits that allow them a fast track toward piscivory.

    “It is interesting that all members of the Scombridae family have an exceptionally fast development of the digestive and visual sensory systems (Tanaka et al., 1996;Morote et al., 2008), developmental traits that allow them a fast track toward piscivory.”

    From Evolutionary and ecological constraints of fish spawning habitats (2015) · cites this paper as Morote et al., 2008

    The Diet and selectivity section (p. 10) reports precocious digestive systems in some early-piscivorous scombrids, but describes Auxis rochei as intermediate between zooplanktivory and piscivory. The Vision enhancement section (p. 11) links improved vision and digestive development to a shift toward larger prey in A. rochei. Neither passage establishes exceptionally fast development of both systems in all Scombridae or a fast track to piscivory for every member. (LLM, conf=0.88)

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Authors
Morote, E., Olivar, M., Pankhurst, P., Villate, F., & Uriarte, I.
Affiliations
  • Consejo Superior de Investigaciones Científicas (ES)
  • James Cook University (AU)
  • University of the Basque Country (ES)
Corresponding author
Morote, E
Venue
Marine Ecology Progress Series
Published
2008-01-17
Volume
353
Pages
243-254
ISSN
  • 0171-8630 (ISSN-L)
  • 1616-1599
OpenAlex
W2132761572
Cited by
73
References
34
Citations by year
2026: 4 · 2025: 3 · 2024: 5 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 4 · 2018: 3 · 2017: 3 · 2016: 4 · 2015: 5 · 2014: 10 · 2013: 1 · 2012: 8
FWCI
3.90
Type
journal article
Language
en
Open access
Locations
  • Marine Ecology Progress Series (publishedVersion)
  • ResearchOnline at James Cook University (James Cook University) (submittedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
James Cook University
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
Keywords
Auxis rochei, bullet tuna, tuna larvae, larval nutrition, food choice, feeding ecology, ontogeny, teeth, niche breadth, prey size, copepod nauplii, Cladocera, appendicularians, fish larvae, visual acuity, lens diameter, cone photoreceptors, diel feeding activity, gut fullness

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