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Free Content Field and Laboratory Observations on Larval Atlantic Sailfish (Istiophorus platypterus) and Swordfish (Xiphias gladius)

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Abstract:

We conducted a 2-year study off Miami, Florida, to verify the presence and seasonality of larval billfish, particularly sailfish (Istiophorus platypterus) and swordfish (Xiphias gladius), and, to examine the feasibility of obtaining laboratory observations on feeding, behavior, and growth. The Gulf Stream's western edge was sampled from April to October 1994, and from March to October 1995, with a 1-mm-mesh plankton net. A total of 315 samples yielded 288 larval sailfish and 2 larval swordfish. Sailfish larvae were present from May to October with a May to July peak, while the two swordfish were captured in May and July. Highest sailfish catches were made from 07:00 to 08:00. No swordfish survived capture at sea. Of the 288 sailfish larvae captured, 87 were alive immediately after capture and these were transported to the University of Miami's experimental hatchery. Of the sailfish captured alive, 23 survived 24 h, 7 survived 48 h, and I survived 72 h. Dissection confirmed that one larval sailfish ingested Artemia introduced as food. This is the first reported observation of larval sailfish feeding.

Document Type: Research Article

Publication date: July 1, 1997

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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