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Seawater challenge test and body composition of Coho salmon (Onchorynchus kisutch)

Čož-Rakovac, Rozelindra; Teskeredžić, Emin; Hacmanjek, Mato; Tomec, Marija; Topić Popović, Natalija; Strunjak-Perović, Ivančica (1999) Seawater challenge test and body composition of Coho salmon (Onchorynchus kisutch). Veterinarni Medicina, 44 (12). pp. 365-371. ISSN 0375-8427

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Abstract

Investigations of the adaptability of two growth groups of coho salmon fry (1+ and 0+) while being transferred from freshwater (FW) into seawater (SW) were performed in the season autumn/winter on four locations (three locations in the Adriatic Sea and one in the FW fish farm, Luknja). Average weight of the 1+ group was 116 g, and average weight of the 0+ group was 86 g. Changes in body composition and condition factor were examined immediately prior to SW transfer, during the early stages of smoltification and for a period of 30 days post-SW transfer. Fish samples (n=10/time point) were taken in FW, during the transport, and after the transfer into the sea (22.5, 45 and 90 min ; 3, 6 and 12 hours, and also 1, 2, 4, 8 and 30 days following the transfer). Results from the experiments demonstrate some differences in the adaptive fitness between the two age groups examined, with inferior adaptation being expressed by the 0+ group. Over the period of investigation an increase in body moisture and decreases in body lipid and protein were observed, when compared against FW controls regardless of smolt age. This might be interpreted as indicating malnourishment due to aphagia, since appetite loss has been described in this, and other oncorhynchids during SW transfer.

Item Type: Article
Uncontrolled Keywords: coho salmon; seawater transfer; body composition
Subjects: NATURAL SCIENCES > Biology
Divisions: Division for Marine and Enviromental Research
Division of Materials Chemistry
Depositing User: Natalija Topić Popović
Date Deposited: 08 Dec 2017 13:37
Last Modified: 08 Dec 2017 14:08
URI: http://fulir.irb.hr/id/eprint/3789

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