On the capture of sailfins istiophorus platypterus (istiophoridae) in waters off the west coast of Kunashir island (sea of Okhotsk) in september 2023

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Abstract

Three immature specimens of Indo-Pacific sailfish Istiophorus platypterus have been found in a catch using a fixed net from the Sea of Okhotsk side of Kunashir Island on September 27, 2023. Data of morphometric measurements of one of them are presented. The total length of the studied specimen was 1101.3 mm, fork length (FL) was 973.8 mm, standard length (SL) was 966.6 mm, lower jaw–fork length (LJFL) was 82.15 cm, and body weight was 2.25 kg. The temperature of the water surface layer in the catch site was 21°C on the date of the capture.

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About the authors

Yu. N. Poltev

Sakhalin Branch, Russian Federal Research institute of Fisheries and Oceanography

Author for correspondence.
Email: poltevyun@sakhniro.vniro.ru
Russian Federation, Yuzhno-Sakhalinsk

V. G. Samarsky

Sakhalin Branch, Russian Federal Research institute of Fisheries and Oceanography

Email: poltevyun@sakhniro.vniro.ru
Russian Federation, Yuzhno-Sakhalinsk

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Supplementary files

Supplementary Files
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1. JATS XML
2. Fig. 1. Catch locations of representatives of the Istiophoridae family: (▲) – Istiophorus platypterus sailfish on September 27, 2023; (●) – an individual not identified to species level in August 2007 (based on: Poltev, Sokov, 2023). Ocean surface temperature on the day of sailfish capture (uncolored areas – foggy areas): (—) – isotherms.

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3. Fig. 2. External appearance of Istiophorus platypterus: a – immediately after capture, b – having lost their body color during life, c – the examined individual TL 1101.3 mm with a fragment of a spear-shaped outgrowth.

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4. Fig. 3. Morphological features of the studied sailfish Istiophorus platypterus TL 1101.3 mm: a – location of the posterior edge of the upper jaw relative to the eye, b – bend of the lateral line; c – fragment of the pelvic fin folded into a groove; d – double keels on the caudal fin.

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