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[Reasons of drifting floating objects aggregating rainbow runner (Elagatis bipinnulata)]
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|April 29, 2014
Summary
Large rainbow runners (Elagatis bipinnulata) aggregate under drifting fish aggregation devices (FADs). Feeding on smaller fish associated with FADs is a likely motivation for this aggregation behavior.
Area of Science:
- Fisheries Science
- Marine Ecology
- Ichthyology
Background:
- Drifting objects, including fish aggregation devices (FADs), attract pelagic species.
- FADs are used in tuna purse seine fisheries, but also attract non-target species like rainbow runner (Elagatis bipinnulata).
- The motivations for rainbow runner aggregation under FADs remain unclear.
Purpose of the Study:
- To evaluate the potential motivations for rainbow runner aggregation under drifting objects.
- To analyze biological data of rainbow runner associated with FADs in the Western and Central Pacific Ocean.
Main Methods:
- Analysis of fishery biological data from scientific observers on Chinese tuna purse seine vessels.
- Examination of rainbow runner fork length, maturity size, and stomach contents.
Main Results:
- Dominant fork lengths for rainbow runner under FADs were 60.0–80.0 cm, indicating larger individuals.
- Mature rainbow runner individuals were predominant under FADs (50% maturity at 65.7 cm fork length).
- Stomach content analysis revealed predation on smaller fish species commonly found near FADs.
Conclusions:
- Feeding on associated small pelagic species is a primary driver for rainbow runner aggregation under FADs.
- Both "concentration of food supply" and "comfortability stipulation" hypotheses may explain rainbow runner aggregation behavior around drifting objects.
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