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Marine Ecology Progress Series

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MEPS 729:201-218 (2024)  -  DOI:

Longshore movements and site fidelity of the iconic giant trevally Caranx ignobilis from southern Africa, determined using passive acoustic telemetry

Russell B. Dixon1,2, Taryn S. Murray1,2, Bruce Q. Mann1,3,*, Paul D. Cowley1,2, Ryan Daly2,3, John D. Filmalter2

1Department of Ichthyology and Fisheries Science, Rhodes University, PO Box 94, Makhanda 6140, South Africa
2South African Institute for Aquatic Biodiversity, Private Bag 1015, Makhanda 6140, South Africa
3Oceanographic Research Institute, PO Box 10712, Marine Parade, Durban 4056, South Africa
*Corresponding author:

ABSTRACT: Giant trevally Caranx ignobilis are iconic, apex marine predators globally distributed in tropical to subtropical regions, where they are of high importance to ecosystems and fisheries. During summer, adults aggregate for spawning, making them vulnerable to overfishing. The world’s largest C. ignobilis aggregation has been recorded in southern Mozambique, but the year-round movements of these fish required further investigation. To assess movement patterns of C. ignobilis along the southern African coast, 36 adult fish were acoustically tagged and monitored along the east coast between Santa Maria in southern Mozambique and Port St Johns in the Eastern Cape, South Africa, for over 5 yr using an extensive passive acoustic receiver array. All acoustically tagged C. ignobilis were recorded in southern Mozambique between November and January each year (with minor exceptions), moving distances up to a maximum of 632 km in one direction. These movements were fast and direct, with maximum travelling speeds of up to 130 km d-1. When not migrating, South African-based fish showed consistent inter-annual fidelity to individual linear areas of space use equivalent to home ranges. Although the coastal length of these areas varied considerably between individuals, even the mean length (92 km) was greater than any previously recorded C. ignobilis home range, globally. Findings from this study, including the value of no-take marine protected areas, are of global ecological interest and have implications for local fisheries management. Protecting these vulnerable aggregations is of the utmost importance for the future of this species in southern African waters and elsewhere.

KEY WORDS: Carangidae · Giant kingfish · Passive acoustic tracking · Spawning migration · Fisheries management

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Cite this article as: Dixon RB, Murray TS, Mann BQ, Cowley PD, Daly R, Filmalter JD (2024) Longshore movements and site fidelity of the iconic giant trevally Caranx ignobilis from southern Africa, determined using passive acoustic telemetry. Mar Ecol Prog Ser 729:201-218.

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