Effects of temperature on specific dynamic action in Atlantic cod Gadus morhua

Abstract

Growth requires that energy is directed towards ingestion, digestion, absorption and assimilation of a meal; energy expenditures are often expressed as the specific dynamic action (SDA). While SDA is an important part of fish energy budgets and strongly affected by water temperature, temperature effects are not known across a wide temperature range in Atlantic cod Gadus morhua. The objective of this study was to examine effects of temperature (2, 5, 10, 15 or 20 °C) on the energetic cost and time used for SDA in juvenile G. morhua by intermittent flow respirometry. At each temperature, G. morhua were fed a meal of herring (Clupea harengus) corresponding to 5 % of the body mass. Standard metabolic rates measured pre-feeding and post-feeding metabolic rates were measured to determine SDA. The study showed that SDA coefficients (%, SDA energy divided by meal energy) were significantly lower at 2 and 10 °C (5.4-6.3 %) compared to 5, 15 and 20 °C (10.4-12.4 %), while SDA duration increased significantly from 80 h at 10 °C to 130-160 h at 2, 15 and 20 °C and reached a maximum of 250 h at 5 °C. The significant decrease in SDA duration at 10 °C combined with a low SDA coefficient suggests that water temperatures close to 10 °C may represent the optimum temperatures for SDA in this population of G. morhua. Our results suggest that SDA is not a simple function of temperature, but may vary with temperature in a more complex fashion.

Measuring maximum and standard metabolic rates using intermittent‐flow respirometry: a student laboratory investigation of aerobic metabolic scope and environmental hypoxia in aquatic breathers

“…By analysing the data, students are familiarized with classic physiological experiments by Ege & Krogh (). At temperatures above the optimum, AMS is often reduced because MMR declines or plateaus while SMR continues to increase (Frisk et al , ; Rummer et al , ; Seth et al , ; Tirsgaard et al , ). In ectothermic animals, a vanishing AMS at higher temperatures is predicted to play a major role with regard to the negative effects of ongoing climate warming (Pörtner & Farrell, ; Pörtner, ).…”

Using acoustic telemetry and snorkel surveys to study diel activity and seasonal migration of round goby (Neogobius melanostomus) in an estuary of the Western Baltic Sea

“…After capture fish were carefully transferred to a net pen, where they were kept for 2 days prior to the tagging. The delayed tagging ensured that digestive processes did not affect recovery from the surgical implant of transmitters (Norin & Clark, ; Tirsgaard, Svendsen & Steffensen, ). On 10–11 October 2016, a total of 50 round gobies were equipped with acoustic transmitters (model V8–4L, 69 kHz, Power Output 144 dB re 1 μPa at 1 m, 8 mm diameter, 20.5 mm long, 2.2 g in air, 0.9 g in water, delay time 70–120 s, 231 days battery life; Vemco Inc., Halifax, Nova Scotia).…”

“…After capture fish were carefully transferred to a net pen, where they were kept for 2 days prior to the tagging. The delayed tagging ensured that digestive processes did not affect recovery from the surgical implant of transmitters (Norin & Clark, 2017;Tirsgaard, Svendsen & Steffensen, 2015 Inc., Halifax, Nova Scotia). The transmitters were implanted in the fish using standard procedures (Piper, Svendsen, Wright & Kemp, 2017;Skov et al, 2005;Svendsen et al, 2011).…”

LAJU RESPIRASI INDUK IKAN BLACKHEAD SEABREAM Acanthopagrus schlegelii PADA SUHU PEMELIHARAAN YANG BERBEDA

“…Pada kebanyakan hewan air, tingkat metabolisme aerobik dapat diperkirakan secara tidak langsung dari pengukuran tingkat konsumsi oksigen atau laju respirasi. Penelitian tentang laju respirasi dalam kaitannya dengan suhu juga terus dikembangkan untuk keperluan budidaya pada berbagai spesies (Gillooly et al, 2001;Sarma et al, 2010;Turker, 2011;Tirsgaard et al, 2015;Prakoso et al, 2016).…”