Swimming behaviour and migration of a swordfish recorded by an archival tag

2003 ◽  
Vol 54 (4) ◽  
pp. 527 ◽  
Author(s):  
Mio Takahashi ◽  
Hiroshi Okamura ◽  
Kotaro Yokawa ◽  
Makoto Okazaki
Keyword(s):  
Water Temperature ◽  
Temperature Data ◽  
Seasonal Migration ◽  
Behaviour Pattern ◽  
Ambient Water ◽  
Archival Tag ◽  
Swimming Depth ◽  
Ambient Water Temperature ◽  
Water Temperature Data ◽  
And Migration

An archival tag equipped with sensors for temperature, depth and luminous intensity is an excellent method to elucidate behaviour and migration of marine organisms. Herein, what we believe is the first successful archival tag experiment with swordfish in the world is reported. The swordfish, which was harpooned with an archival tag encased in a plastic capsule, was released in July 1999 off the east coast of Japan. The fish was recaptured by a harpoon fishing vessel in June 2000, only 103 km from the tagging location and weighed approximately 120-kg. By comparing the water temperature data of the archival tag with oceanographic data, a cyclic seasonal migration between the food-rich Oyashio cold current area (40–45°N) during summer and the subtropical wintering area (10–20°N) was suggested. During most of the days of observation and for the majority of the time within a day, tagged fish swam in cold water (3–6°C) and deeper than approximately 200 m; at night, fish generally stayed near the warmer surface waters (21–27°C). The greatest swimming depth was approximated to be 900 m, deduced from ambient water temperature data. The swimming depth and behaviour pattern changed in response to the ambient water temperature.

scholarly journals A Note on the Collection and Cleaning of Water Temperature Data

Water ◽  
2012 ◽  
Vol 4 (3) ◽  
pp. 597-606 ◽  
Author(s):  
Colin Sowder ◽  
E. Ashley Steel
Keyword(s):  
Water Temperature ◽  
Temperature Data ◽  
Water Temperature Data

Diving behavior in relation to ambient water temperature in northern elephant seals

1994 ◽  
Vol 72 (4) ◽  
pp. 643-651 ◽  
Author(s):  
Hiroshi Hakoyama ◽  
Burney J. Le Boeuf ◽  
Yasuhiko Naito ◽  
Wataru Sakamoto
Keyword(s):  
Water Temperature ◽  
Elephant Seal ◽  
Diving Behavior ◽  
Mirounga Angustirostris ◽  
Ambient Water ◽  
Northern Elephant Seal ◽  
Elephant Seals ◽  
Northern Elephant Seals ◽  
Abrupt Changes ◽  
Ambient Water Temperature

Our aim was to describe changes in ambient water temperature during the course of migration by northern elephant seals (Mirounga angustirostris) and to examine evidence for the seal using abrupt temperature gradients for locating prey. During migration in the post breeding season, the diving patterns of 10 adult females and 7 breeding-age males from Año Nuevo, California, were recorded with time–depth recorders in 1989–1991. Recorded sea surface temperatures declined from 11–13 °C to a low of 3–9 °C as the seals moved north and increased as they returned. Depth of diving was not closely linked to sharp thermal gradients. A thermocline was evident only at the beginning and end of the migration in less than 100 m of water, where less than 2% of diving takes place. There were sex differences in the temperature range at the depths where 75% of diving and foraging occurred, owing in part to habitat separation. The temperatures were lower and the range narrower for females (4.2–5.2 °C at 388–622 m) than for males (5.3–6.0 °C at 179–439 m). We conclude that the northern elephant seal habitat does not provide abrupt changes in temperature that might serve as important cues for locating prey.

Longevity, Body Size, and Growth in Anadromous Brown Trout (Salmo trutta)

1991 ◽  
Vol 48 (10) ◽  
pp. 1838-1845 ◽  
Author(s):  
Bror Jonsson ◽  
Jan Henning L'Abée-Lund ◽  
Tor G. Heggberget ◽  
Arne J. Jensen ◽  
Bjørn O. Johnsen ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Water Temperature ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Ambient Water ◽  
Ambient Water Temperature ◽  
Brown Trout Salmo Trutta ◽  
Interpopulation Variation ◽  
Temperature And Growth

Longevity in 25 populations of anadromous brown trout (Salmo trutta) showed a significant trend with increasing life span at latitudes of 58–70°N in Norway, with the largest change from 58 to 60°N. Moreover, longevity was negatively correlated with temperature and growth rate in freshwater and at sea. Body size was negatively correlated with water temperature and growth rate in freshwater, but not with latitude or water temperature and growth rate at sea. Thus, conditions influencing development and metabolic rates in fresh water seem more important than conditions in the sea in determining variation in longevity and body size of anadromous brown trout. Our results support the hypothesis that interpopulation variation in longevity and body size is influenced by rate of metabolism, chiefly influenced by ambient water temperature.

Influence of Temperature and Light on Rates of Inorganic Nitrogen Transport by Algae in an Arctic Lake

1984 ◽  
Vol 41 (9) ◽  
pp. 1310-1318 ◽  
Author(s):  
S. C. Whalen ◽  
V. Alexander
Keyword(s):  
Water Temperature ◽  
Inorganic Nitrogen ◽  
Ambient Water ◽  
Third Order ◽  
Arctic Lake ◽  
Light Dependence ◽  
Tracer Techniques ◽  
Half Saturation Constant ◽  
Ambient Water Temperature ◽  
The Individual

Nitrogen-15 tracer techniques were used to assess the individual effects of temperature and light on maximum rates of dissolved inorganic nitrogen (DIN) transport by phytoplankton in an arctic lake. Transport rates of NO3− and NH4+ as a function of temperature in the range 3–30 °C were adequately described by second- or third-order polynomial functions. The optimum temperature for DIN transport was greater than the ambient water temperature by as much as 13°; thus, transport at the ambient water temperature averaged only 55–60% of optimum. Mean temperature coefficients [Formula: see text] for NO3− and NH4+ transport in the temperature range >0–15 °C were 2.3 ± 0.5 and 2.4 ± 0.3. The ratio of dark to light-saturated DIN transport (ρD/ρL) was used as a measure of light dependence in maximum rates of DIN transport. Values of ρD/ρL[Formula: see text] for NO3− and NH4+ were 0.15 ± 0.09 and 0.41 ± 0.11, indicating a stronger light dependence for NO3− than NH4+ transport. In cases where dark NO3− transport was negligible, light was treated as a substrate and the Michaelis–Menten relationship fitted to the data. The half-saturation constant for light intensity in maximum NO3− transport ranged from 7 to 29 μE∙m−2∙s−1, which was 6–31% of the photosynthetically active radiation at the lake surface.

scholarly journals Effectiveness of Livewell Additives on Largemouth Bass Survival

2011 ◽  
Vol 2 (1) ◽  
pp. 22-28 ◽  
Author(s):  
Kenneth G. Ostrand ◽  
Michael J. Siepker ◽  
David H. Wahl
Keyword(s):  
Water Temperature ◽  
Largemouth Bass ◽  
Laboratory Experiments ◽  
Field Experiments ◽  
Micropterus Salmoides ◽  
Fish Mortality ◽  
Ambient Water ◽  
Fish Size ◽  
Ambient Water Temperature ◽  
Delayed Mortality

Abstract Livewell conditions during competitive angling events are thought to affect fish mortality. We examined the effects of livewell additives on initial and delayed mortality of largemouth bass Micropterus salmoides. We applied three treatments (salt, ice, or salt and ice) to livewells during tournaments conducted on lakes in Illinois, United States, as well as in laboratory and pond experiments designed to examine the effects of fish size and ambient water temperature on mortality. Fish were collected after tournament weigh-in procedures were completed and monitored for delayed mortality every 24 h for 5 d. Initial mortality did not differ among livewell additives during these field experiments. Although delayed mortality was high (35%), it was not significantly different among livewells that contained salt (56%), ice (48%), ice and salt (40%), and controls (30%). Additives administered during the laboratory experiments, at cool water temperatures, resulted in significantly lower delayed mortalities than those observed during the field experiments when ambient water temperatures were warmer. Initial and delayed mortality did not differ among livewell additives during the laboratory experiments. Larger fish in field experiments had significantly greater delayed mortality than smaller fish in the pond experiments even though initial and delayed mortality did not differ among livewell additives. Our results suggest that fish size and ambient water temperature have a greater influence on delayed mortality observed during competitive angling events than the specific livewell additives studied here.

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