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Author Nguyen, K.Q.; Tran, P.D.; Nguyen, L.T.; To, P.V.; Morris, C.J.
Title Use of light-emitting diode (LED) lamps in combination with metal halide (MH) lamps reduce fuel consumption in the Vietnamese purse seine fishery Type Journal Article
Year 2020 Publication (up) Aquaculture and Fisheries Abbreviated Journal Aquaculture and Fisheries
Volume in press Issue Pages in press
Keywords Economics; Animals; Lighting
Abstract The use of high-power lights during night-time purse seining is common in Vietnam. Typically, metal halide (MH) lamps are used in the commercial fishery to attract fish, however these lights require more energy, have a shorter lifespan, and lower chromatic performance than light emitting diode (LED) lamps. This study examined catch efficiency and fuel consumption when using LED lamps in combination with reduced numbers of MH lamps (10.24 kW), compared to conventional lighting (28.6 kW), used during purse seining off the coast of Ninh Thuan province, Vietnam. The economic performance associated with using LED lamps in this fishery was also assessed. We found no significant differences in catch rates between the different light treatments, however fuel consumption was significantly reduced. Fuel consumption per nightly trip using LED with MH lamps was 70.8 l (11.1 l/h) compared to114 l (17.45 l/hr) using MH lamps alone, an estimated 37.9% reduction in fuel consumption. An investment in LED lamps by a fishing enterprise will require additional initial costs, however our analysis revealed the financial break-event point can be reached after approximately 101 nightly trips when the fuel price is at the 2015 level of USD $0.74 per l. Fishing enterprises can increase their profitability, and reduce CO2 emissions, by using LED lamps in the Vietnamese purse seine fishery.
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ISSN 2468550X ISBN Medium
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Call Number GFZ @ kyba @ Serial 3102
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Author Wright, D.; Glaropoulos, A.; Solstorm, D.; Stien, L.; Oppedal, F.
Title Atlantic salmon Salmo salar instantaneously follow vertical light movements in sea cages Type Journal Article
Year 2015 Publication (up) Aquaculture Environment Interactions Abbreviated Journal Aquacult. Environ. Interact.
Volume 7 Issue 1 Pages 61-65
Keywords Animals
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ISSN 1869-215X ISBN Medium
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Call Number LoNNe @ kyba @ Serial 1243
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Author Gao, X.; Li, X.; Zhang, M.; Chi, L.; Song, C.; Liu, Y.
Title Effects of LED light quality on the growth, survival and metamorphosis ofHaliotis discus hannaiIno larvae Type Journal Article
Year 2016 Publication (up) Aquaculture Research Abbreviated Journal Aquac Res
Volume 47 Issue 12 Pages 3705–3717
Keywords Animals; Haliotis discus hannai Ino; larva; LED light quality; initial stage of lighting; embryonic development; abalone; photobiology
Abstract Light is a key environmental factor influencing the growth, development and survival of aquatic organisms. We examined the effects of different light qualities (red, orange, white, blue, green or no light) and developmental stage at initial lighting [fertilized egg (FE), trochophore larva (TL), or eye-spot larva (EL)] on the growth, development, and survival of larvae of the Pacific abalone Haliotis discus hannai Ino. Larva-hatching success was significantly higher under blue, green, or no light compared with red, orange or white light (P < 0.05). Larval abnormalities were significantly increased under red, orange or white light compared with all other light qualities (P < 0.05). The incidence of metamorphosis in larvae illuminated from the TL stage was significantly higher under blue compared with other light qualities. Irrespective of the stage at initial illumination, the incidence of metamorphosis was lower in larvae cultured under red, orange or no light compared with other light qualities, but the differences were not significant (P > 0.05). Juvenile survival was significantly higher under blue or green compared with other light qualities (P < 0.05), with no significant effect of stage at initial illumination (P > 0.05). Larval size at completion of the shell was unaffected by stage at initial illumination, but was greater under blue or green light, while size at metamorphosis was greatest following illumination with blue or green light since the TL or EL stage (P < 0.05). Metamorphosis time was shortest with blue or green light and in cultures illuminated from the FE or TL stage (P < 0.05). Larval development from the FE to formation of the fourth tubule on the cephalic tentacles was fastest in larvae exposed since the FE or TL stage to blue or green light, compared with other light qualities (P < 0.05). However, there was no difference in terms of the rate of development from the FE to the TL stage between cultures lit or unlit since the FE egg stage (P > 0.05). These results suggest that a blue or green light source applied from the TL stage can increase the hatching and yield of H. discus hannai Ino, with important implications for the development of the aquaculture industry.
Address Research and Development Center of Marine Biotechnology, Institute of Oceanology, Chinese Academy of Science, 7 Nanhai Road, Qingdao 266071, Shandong Province, China; 18354292961(at)163.com.
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Publisher Wiley Place of Publication Editor
Language English Summary Language English Original Title
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ISSN 1355557X ISBN Medium
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Call Number IDA @ john @ Serial 1340
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Author Imsland, A.K.; Roth, B.; Foss, A.; Vikingstad, E.; Stefansson, S.O.; Pedersen, S.; Sandvik, T.; Norberg, B.
Title Long-term effect of photoperiod manipulation on growth, maturation and flesh quality in Atlantic halibut. Type Journal Article
Year 2009 Publication (up) Aquaculture Research Abbreviated Journal
Volume 40 Issue 11 Pages 1260-1269
Keywords animals; fish; aquaculture; animal production
Abstract The aim of this study was to investigate the effect of continuous light at different stages during the production cycle of Atlantic halibut Hippoglossus hippoglossus L. on growth, age at first maturity, endocrine parameters and flesh quality. A group of juvenile halibut [mean (SD), initial weight 191.3 g (44.7)] was reared in indoor tanks under ambient temperature conditions for 38 months until harvesting (mean final weight, 4.6 kg). The entire photoperiod experiment was divided into four phases, where the fish in each phase were exposed to either natural photoperiod (62°33&#8242;N) or continuous light (L). Thus, the following five photoperiod combinations were tested: (a) Control group (NNNN), (b) Group 2A (NLNN), (c) Group 2B (NNLN), (d) Group 2C (NNNL) and (e) Production group (LNNN). Exposure to continuous light stimulated growth, and the final mean weights of Groups 2A and 2B were 23% and 11% higher than those of the Control group (NNNN). The final plasma 11-ketotestosteron levels were lower in Groups 2A (2.94 ng mL&#8722;1) and 2B (2.46 ng mL&#8722;1) compared with the Control (5.29 ng mL&#8722;1), Group 2C (5.09 ng mL&#8722;1) and the Production group (4.78 ng mL&#8722;1) during spring 2007 (age 4 years), indicating higher age at first maturity in Groups 2A and 2B. Photoperiod regime had only a minor, and transient, effect on flesh-quality traits of the fish, whereas a significant seasonal effect was seen with a tendency towards increased gaping, lower pH, lower hardness and lower shear force in July compared with December and March.
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Call Number LoNNe @ schroer @ Serial 1592
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Author Boscarino, B.T.; Rudstam, L.G.; Eillenberger, J.L.; O'Gorman, R.
Title Importance of light, temperature, zooplankton and fish in predicting the nighttime vertical distribution of Mysis diluviana Type Journal Article
Year 2009 Publication (up) Aquat Biol Abbreviated Journal
Volume 5 Issue Pages 263-279
Keywords Animals; Mysis relicta; Modeling; Migration; Zooplankton; Vertical distribution; DVM
Abstract The opossum shrimp Mysis diluviana (formerly M. relicta) performs large amplitude diel vertical migrations in Lake Ontario and its nighttime distribution is influenced by temperature, light and the distribution of its predators and prey. At one location in southeastern Lake Ontario, we measured the vertical distribution of mysids, mysid predators (i.e. planktivorous fishes) and mysid prey (i.e. zooplankton), in addition to light and temperature, on 8 occasions from May to September, 2004 and 2005. We use these data to test 3 different predictive models of mysid habitat selection, based on: (1) laboratory-derived responses of mysids to different light and temperature gradients in the absence of predator or prey cues; (2) growth rate of mysids, as estimated with a mysid bioenergetics model, given known prey densities and temperatures at different depths in the water column; (3) ratio of growth rates (g) and mortality risk (&#956;) associated with the distribution of predatory fishes. The model based on light and temperature preferences was a better predictor of mysid vertical distribution than the models based on growth rate and g:&#956; on all 8 occasions. Although mysid temperature and light preferences probably evolved as mechanisms to reduce predation while increasing foraging intake, the response to temperature and light alone predicts mysid vertical distribution across seasons in Lake Ontario.
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Call Number LoNNe @ christopher.kyba @ Serial 402
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