Rachel T. Graham

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We describe the real-time movements of the last of the marine mega-vertebrate taxa to be satellite tracked - the giant manta ray (or devil fish, Manta birostris), the world's largest ray at over 6 m disc width. Almost nothing is known about manta ray movements and their environmental preferences, making them one of the least understood of the marine(More)
We present diving data for four whale sharks in relation to a predictable food pulse (reef fish spawn) and an analysis of the longest continuous fine-resolution diving record for a planktivorous shark. Fine-resolution pressure data from a recovered pop-up archival satellite tag deployed for 206 days on a whale shark were analysed using the fast Fourier(More)
There were 479 reported whale shark Rhincodon typus encounters between 1999 and 2011 at the island of Utila, which forms part of the Meso-American Barrier Reef System (MBRS) in the western Caribbean Sea. The majority of R. typus were found to feed on small bait fish associated with various tuna species. Ninety-five individual R. typus, ranging from 2 to 11(More)
Animals exhibit various physiological and behavioural strategies for minimizing travel costs. Fins of aquatic animals play key roles in efficient travel and, for sharks, the functions of dorsal and pectoral fins are considered well divided: the former assists propulsion and generates lateral hydrodynamic forces during turns and the latter generates vertical(More)
Soil organic components are important factors in the health and productivity of Inland Northwest forests. Timber harvesting and extensive site preparation (piling, windrowing, or scalping) reduces the amgun t of surface organic material (woody residues and forest floor layers) over large areas. Some wildfires and severe prescribed burns can have similar(More)
Common names: Goliath grouper, Jewfish, guasa, cherna. Conservation status: IUCN Red List — Critically Endangered A2d. Identification: Body is robust, elongate, brownish-yellow; black spots present on dorsum, cranium and fins becoming smaller with growth; small dorsal spines and rounded caudal fin. Head is broad and flat with relatively small eyes. Max size(More)
Animal migration is ubiquitous in nature with individuals within a population often exhibiting varying movement strategies. The basking shark (Cetorhinus maximus) is the world's second largest fish species, however, a comprehensive understanding of their long-term wider-ranging movements in the north-east Atlantic is currently lacking. Seventy satellite(More)
Background: A new record of Neoharriota carri is here reported for the Caribbean of Guatemala. Results: Two chimaeras, a male and female Neoharriota carri, were caught with a single panel trammel net off the coast of El Quetzalito, Guatemala in February 2015 and January 2016 respectively. Details concerning the identification and measurement of these(More)
Background: This report represents the first record of the sharpnose sevengill shark Heptranchias perlo in Guatemala’s Caribbean Sea. Methods: Two H. perlo specimens were captured by artisanal fishermen of the coastal community, El Quetzalito. All specimens were captured with a trammel net, in waters of 200 m depth Results: Both specimens were female with(More)
Background: The present study represents the first record of Scyliorhinus hesperius in Guatemala’s Caribbean Sea. Methods: Five male whitesaddled catsharks, S. hesperius, were captured in 200 m deep waters of Guatemala’s Caribbean coast. Results and Conclusion: All specimens were male with total lengths ranging from 420 mm to 510 mm. These fish represent(More)