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Insights into the environmental conditions contributing to variability in the larval recruitment of the tropical sardine Sardinella lemuru

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  • Pata, Patrick R.
  • Yñiguez, Aletta T.
  • Deauna, Josephine Dianne L.
  • De Guzman, Asuncion B.
  • Jimenez, Cesaria R.
  • Rosario, Roselle T. Borja-Del
  • Villanoy, Cesar L.

Abstract

The small pelagic fishery in the southern Philippines is one of the largest contributors to fisheries production in the country, and is dominated by the Bali sardine Sardinella lemuru. This species is a year-round spawner that has its peak spawning period during the northeast monsoon (NEM) months of November to February. However, there is still limited information on the conditions that affect this species’ survival during its early life history stages. Here, we attempt to discern the importance of temperature, prey density and advection on sardine larvae. The larvae were represented as passive particles that were released in known spawning grounds to simulate dispersal. The conditions the larvae experienced, namely, temperature and estimated prey density based on satellite chlorophyll-a values were recorded at each time step until the estimated recruitment age of 60 days. The temporal and spatial averaged conditions of recruited sardines showed that sardines spawned during the NEM months experienced higher chlorophyll-a, lower (more optimal) sea surface temperature, albeit higher advective loss, than sardines spawned during other months. Comparisons between years showed that during higher reported catch years, sardine larvae experienced lower temperatures and higher retention nearshore. Our results emphasize that sardine stock management efforts need to recognize the contribution of the temporally variable sardine environment to patterns in sardine recruitment and consequently in catches.

Suggested Citation

  • Pata, Patrick R. & Yñiguez, Aletta T. & Deauna, Josephine Dianne L. & De Guzman, Asuncion B. & Jimenez, Cesaria R. & Rosario, Roselle T. Borja-Del & Villanoy, Cesar L., 2021. "Insights into the environmental conditions contributing to variability in the larval recruitment of the tropical sardine Sardinella lemuru," Ecological Modelling, Elsevier, vol. 451(C).
  • Handle: RePEc:eee:ecomod:v:451:y:2021:i:c:s0304380021001290
    DOI: 10.1016/j.ecolmodel.2021.109570
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    References listed on IDEAS

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    1. Le Fur, Jean & Simon, Patrick, 2009. "A new hypothesis concerning the nature of small pelagic fish clusters," Ecological Modelling, Elsevier, vol. 220(9), pages 1291-1304.
    2. Okunishi, Takeshi & Yamanaka, Yasuhiro & Ito, Shin-ichi, 2009. "A simulation model for Japanese sardine (Sardinops melanostictus) migrations in the western North Pacific," Ecological Modelling, Elsevier, vol. 220(4), pages 462-479.
    3. T. Kristiansen & C. Jørgensen & R. G. Lough & F. Vikebø & &O. Fiksen, 2009. "Modeling rule-based behavior: habitat selection and the growth-survival trade-off in larval cod," Behavioral Ecology, International Society for Behavioral Ecology, vol. 20(3), pages 490-500.
    4. Ospina-Alvarez, Andrés & Parada, Carolina & Palomera, Isabel, 2012. "Vertical migration effects on the dispersion and recruitment of European anchovy larvae: From spawning to nursery areas," Ecological Modelling, Elsevier, vol. 231(C), pages 65-79.
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