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The Ecology of North American Freshwater Fishes By Stephen T. Ross,University of California Press,Berkeley and Los Angeles, 2013, ISBN 978‐0‐520‐24945‐5, Hardcover USD 75.00, GBP 52. Graphs and Figures,pp.480.
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Laura A. Kennedy Aharon G. Fleury Jessica J. Holden Alison E. Macnaughton Piatã S. Marques Geoffrey J. Osgood Francis Juanes 《Fish and Fisheries》2015,16(4):723-725
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Sudong Xia Wei Zhao Man Li Dan Zhang Li Nan Hong Qian Chunyan Guo Lian Yang Geng Xuyun 《Aquaculture Nutrition》2020,26(1):165-173
We evaluated the influence of different proportions of 5′‐inosine monophosphate (IMP) and 5′‐guanosine monophosphate (GMP) on growth, feed digestibility and activity of digestive enzymes of turbot Scophthalmus maximus. Weight gain and daily feed intake were significantly higher in S. maximus fed with IMP or GMP, in comparison with fish fed with neither IMP nor GMP. The growth of 0.05% IMP + 0.05% GMP group was the best, and the intestinal digestive function was improved. The addition of IMP and GMP to fish diets significantly increased the apparent feed digestibility coefficient of dry matter and protein, as well as intestinal protease activity. The highest intestinal protease activity was observed in fish fed with 1 g/kg IMP. However, the lipase activity in hepatopancreas decreased significantly after addition of nucleic acid. According to our results, the optimal level of dietary IMP is 1 g/kg, which is in line with most of the growth performance and feed digestibility. 相似文献
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Maria J. Sánchez‐Muros Encarnación Gómez‐Milán Fernando G. Barroso Francisco Manzano‐Agugliaro 《Journal of the World Aquaculture Society》2013,44(1):105-114
This study examines the daily and annual changes in amylase and basic and acid protease activities in gilt‐head sea bream, Sparus aurata. During the experiment, the fish were kept in cages for production under natural temperature and photoperiod conditions and fed with a commercial diet. To study the effect of photoperiod and temperature, the experiments were conducted during six different months that were chosen based on temperature and photoperiod. To determine daily changes in enzymes activities, for every 3 h during 24 h period, six fish were randomly selected and sacrificed. The annual results for acid protease activity show a rhythm with 6‐mo period (bimodal rhythm) with acrophases in May and November. The activities of pancreatic enzymes, which include basic protease and amylase, exhibited parallel changes with two peaks of activity in January and October without a rhythmic pattern. The daily changes in enzyme activities are significant only in May, June, and November for basic proteases and May, October, and November for amylase (P < 0.05). The observed variations suggest a varying capacity for digestion depending on the day and the year and could aid in the study of seasonal feeding protocols. 相似文献
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