Journal of Advanced Marine Science and Technology Society
Online ISSN : 2188-3262
Print ISSN : 1341-2752
ISSN-L : 1341-2752
Research Paper
Long term recording of red sea bream behaviour using a temperature and depth data logger
Yasushi MitsunagaNobuaki AraiWataru Sakamoto
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JOURNAL FREE ACCESS

2003 Volume 8 Issue 1 Pages 25-33

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Abstract
Continuous record of ambient water temperature and depth was obtained for a free-ranging red sea bream using a data logger in the natural sea for over 150 days. The fish (FL 43.0cm, BW 1.5kg) was releasedon 1 December, 1997 at a point in Wakasa Bay (35° 35' N, 135° 29' E) and recovered on 5 May, 1998 at a pointwhere was 15km far from the releasing point(35° 44' N, 135° 26' E). Temperature recordwasdividedintothree typicalpatternsin accordance withseasonal environmental change;decreasing temperature period from early to mid winter, low and constant temperature period from mid February to early April, and increasing temperature period from early to mid spring, respectively. Swimmingactivity increased with rising water temperature in the increasing temperature period. The critical temperature for activity to beginwas 12° C. This value wasequal to the lowerlimit of optimum temperature of red sea breams whichwas determined by respiratory trials. Risingup to 12° Cambientwatertemperature seems to switch the behaviour of red sea bream in the natural sea.
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