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Increased abundances of a number of seabird species have been found in areas of mussel longline aquaculture (compared to control
sites) in a recent study at Bantry Bay, southwest Ireland. The aim of this study was to investigate whether this form of mussel
aquaculture also affects the activity budgets and foraging behaviour of these seabirds. Scan-sampling was used to compare
seabird activity budgets between three areas of mussel longline aquaculture and three control sites. Foraging activities of
Great-Northern Divers Gavia immer, an Annex 1 species under the Euopean Union's Birds Directive, were also compared between sites using focal sampling. The
behaviour of gulls (Larus sp.), Cormorants Phalacrocorax carbo, Shags Phalacrocorax aristotelis and Great-Northern Divers (but not auks, Alcidae) differed significantly between areas of mussel aquaculture and control
sites in this study. Mussel suspension buoys were heavily utilized by gulls, cormorants and shags as safe perching platforms
for preening activities. Gulls also fed extensively on epifauna attached to the buoys. Great-Northern Divers spent more time
snorkelling (head submerged in search of food) in mussel sites than in the control sites, however dive duration and visible
foraging success rates did not differ significantly between sites. Overall, the environmental impact of mussel suspension
culture appears to be positive or neutral on marine bird species occurring at this study site. 相似文献
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Freshwater mussel Lamellidens marginalis showed a Ca2+-stimulated ATPase activity in the microsomal fraction of gill. Mg2+ was also found to be an activating cation for this ATPase enzyme. Ca2+ ATPase showed maximal activity at 40 °C and between pH 7.5–8.0. Substrate specificity of Ca2+ ATPase was highest with ATP, followed by GTP and other trinucleotides such as UTP, CTP and ADP also showed some amount of hydrolysis. Ca2+ ATPase showed slight inhibition with ruthenium red and sodium vanadate and is insensitive to sodium azide, ouabain, oligomycin B and phenylalanine. Heavy metals like Hg2+, Cu2+ and Zn2+ showed 50% inhibition of Ca2+ ATPase activity at concentrations of 0.25 mM, 0.5 mM and 1 mM, respectively whereas Cd2+ and Ni2+ showed 39% and 28% inhibition of enzyme activity at 1 mM concentrations. 相似文献
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Adriana C. Neves Pádraigín A. Harnedy 《Journal Of Aquatic Food Product Technology》2013,22(8):1221-1233
ABSTRACTProtein extracted from mussel processing coproducts was hydrolyzed with four different food-grade enzyme preparations and assessed for angiotensin converting enzyme (ACE) and dipeptidyl peptidase-IV (DPP-IV) inhibitory and oxygen radical antioxidant capacity (ORAC) activities. All hydrolysates tested showed higher activity than the intact protein. ACE and DPP-IV IC50 values in the range 1.13–3.34 and 0.33–2.43 mg mL?1, respectively, and ORAC values in the range 66.26–121.56 µmol trolox equivalents g–1 were obtained. These results suggest that some of the mussel meat protein hydrolysates may have potential as functional food ingredients for the management of diseases such as type II diabetes and hypertension. 相似文献
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Effects of stocking density on survival,growth and biochemical composition of cultured mussels (Mytilus galloprovincialis,Lamarck 1819) from an offshore submerged longline system 
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下载免费PDF全文 Sedat Karayücel Meryem Yeşim Çelik İsmihan Karayücel Recep Öztürk Bora Eyüboğlu 《Aquaculture Research》2015,46(6):1369-1383
This study examined an offshore submerged mussel longline system, in the Black Sea, from May 2009 to May 2010. The system was allowed 1 year for spat collection. After a 1‐year spat collection period, some spat collectors were left untouched (NS), and some spat collectors were grazed and socked (S) for a grow‐out study in May 2009. The effects of stocking density on the growth and survival of the S and NS mussels were examined. The biochemical composition of the mussels was also determined. Environmental factors including temperature, salinity, chlorophyll a, total suspended matter, inorganic matter and organic matter were monitored monthly during the experimental period. In May 2010, the mean length and live weight of the S and NS mussels were 60.46 ± 0.60 mm and 53.34 ± 0.37 mm, respectively, and 20.50 ± 0.50 g and 13.11 ± 0.26 g respectively. Mean moisture and ash were 82.35 ± 0.47% and 6.67 ± 0.44% respectively. Mean carbohydrate, protein and lipid were 27.74 ± 2.40%, 57.68 ± 2.15% and 7.91 ± 0.68% respectively. These results indicate that a submerged offshore mussel culture system in the Black Sea can be commercially convenient. In addition, stock management via thinning out of the spat can considerably increase the marketable size of mussels, reduce harvest time and produce better growth. 相似文献
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Published information on the spatial organization of mussel culture suspensions (collectors, socks, droppers and poles) is reviewed. Despite the several hundred studies on mussel culture this type of information is very scarce but suggests that mussels self-organize into phyllotatic patterns similar to those widely studied in cylindrical/tubular biological structures and mineral crystals. I demonstrate that space regulated self-thinning (SST) models developed for plane substrates are not applicable to mussel suspensions and propose a new SST model based on the packing geometry of mussel shells around a rope. The robustness of this model is assessed by its application to a wide range of cultured populations. This comparison suggests that the carrying capacity of individual suspensions for commercial-sized mussels is equivalent to a single layer of tightly packed mussels around the rope, independently of the species, type of suspension, presence/absence of pegs, site (growth rate) and stocking density and size. The emergent mechanical properties of these porous, extremely rough and heterogeneous bodies are reviewed. The proposed SST model provides insights into the biomechanical processes of self-thinning and sloughing. 相似文献
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Aquaculture is one of the fastest growing food production sectors in recent decades. Such rapid development emphasizes the need to adopt more efficient production strategies while simultaneously increasing productivity and sustainability. Monitoring of production is an important strategy to achieve process efficiency. Therefore, we conducted a time and motion study using operational performance indicators to evaluate mussel harvesting on a commercial marine farm in Southern Brazil. We analyzed the operations of mussel sea withdrawal and disaggregation, which are widely used by local farmers but demanding for workers to perform. Mussel sea withdrawal and disaggregation had standard times of 133.7 and 266.7 s, respectively, for one mussel rope; operational production capacities of 0.16 and 0.08 kg s−1, respectively; operational efficiencies of 100 and 31.6%, respectively; time efficiencies of 56.1 and 34.7%, respectively, rework percentages of 0 and 65%, respectively; and percentages of damaged products of 0 and 3.4%, respectively. These parameters indicate low operational performance. The approach used in this study also allowed us to identify process wastes and propose ways to eliminate or mitigate them, with the aim of adopting more efficient work methods. 相似文献
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采用环境毒理学急性毒性试验分析方法,分别于24、48、72和96 h研究Hns对海洋污损生物紫贻贝和牡蛎的半数致死浓度、95%置信区间和安全浓度(CS)。结果表明,Hns对紫贻贝的毒性比对牡蛎的毒性高,安全质量浓度为0.854 mg/L,几乎是Hns对牡蛎毒性的8倍。 相似文献
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