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采用围隔设置单养虾(S)、单养藻(A)、虾藻混养(SA)、虾鱼藻混养(SFA)4种不同养殖模式,探讨菊花江蓠(Gracilaria lichevoides)对围隔高密度对虾养殖过程中产生的污染进行净化和水质调控作用。结果表明,养殖菊花江蓠的围隔水体中有更高的DO水平和较低的营养盐水平,说明对养殖水体的环境因子和营养盐都能起到很好的调控作用。水体中弧菌密度也较低,养殖环境稳定性好,使得养殖的对虾生长快,成活率高。与S相比,SA中的对虾成活率提高了32%。本实验对于采用搭配大型海藻进行养殖污染的净化与水质调控方法是可行的和有效的。 相似文献
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C.?HallingEmail author G.?Aroca M.?Cifuentes A.?H.?Buschmann M.?Troell 《Aquaculture International》2005,13(5):409-422
In Chile the integration of Gracilaria chilensis with salmon culture has shown high potential. Seaweed integrated aquaculture is of great interest as it allows waste recycling within fed cage aquaculture. The development of economically feasible suspended methods of seaweed cultivation is therefore of high importance. Hence, production and performance of two suspended Gracilaria cultivation methods, spore inoculated ropes and ropes with twined field collected seaweed, were studied in open water. The production from spore-seeded ropes was comparable to that of twined ropes for the first month of culture. Thereafter, the twined ropes had a significantly higher productivity. Fish farm wastes had no significant fertilizing effect upon Gracilaria growth rate. In addition, spore-originated thalli and field collected thalli were compared under laboratory conditions and in suspended culture using the same cultivation method. Spore-originated thalli had a 50% lower growth rate than the field collected thalli under laboratory conditions; however, no significant differences were detected in the field. Also, the occurrence of spore coalescence growth enhancement was not significant on the spore-seeded ropes. It was concluded that spore-originated cultivation techniques could be of interest for an integrated open seawater aquaculture system due to the high levels of Gracilaria polymorphism. This would result in greater adaptability to environmental variations, and a continuous supply of restocking material. 相似文献
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本试验研究改良了池塘水质环境,预防了疾病的发生和避免了虾蟹相残,使以虾为主的虾、蟹、藻混养试验池与对虾单养对照池的对虾成活率大体接近,实现亩均综合产量222.05kg,亩均产值6985.13元,亩均盈利2472.61元,是一种高产、优质、高效的多元化养殖模式。 相似文献
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Algal-oligosaccharide-lysates prepared by two bacterial agarases stepwise hydrolyzed and their anti-oxidative properties 总被引:1,自引:0,他引:1
Twenty algal-oligosaccharide-lysates (AOLs), derived from six agars and four algal polysaccharide extracts (APEs), were treated
first with agarases with 250 or 500 agarase activity units (AU), which were produced from the agar-liquefying bacterial strain
Pseudomonas vesicularis MA103, named MA103-agarases. The AOLs were then treated with agarases (250 or 500 AU) derived from the agar-softening bacterial
strain Aeromonas salmonicida MAEF 108, named MAEF 108-agarases. Anti-oxidative properties of the AOLs were evaluated by five in vitro methods. The AOL obtained from the APE of Porphyra dentate, digested by 250 AU of MA 103-agarases, and by 250 AU of MAEF 108-agarases, designated as A250-Por, showed better results than the 19 other AOLs. This result is in accordance with the level of soluble total polyphenols
(STP) of A250-Por, which was also higher than the remainder of the AOLs tested. The AOL derived from the APE of P. dentate, digested by 500 AU of MA103-agarases and then 500 AU of MAEF108-agarases, and designated as B500-Por, displayed the second highest data in four potential evaluation methods, except in H2O2 scavenging capacity. In this study, certain agars or APEs digested by specific agarases can present an increasing antioxidative
capacity. These agars include Bitek agar, Agar powder, Bacteriological, Agar Bacteriological, and Guanghui agar, plus APEs
of Gracilaria sp. and Monostroma nitidum decomposed stepwise by two agarases. The fraction of polyphenols (<1 kDa) that were derived from A250-Por showed anti-oxidative activities on α, α-diphenyl-β-picrylhydrazyl (DPPH) assay and reducing power determination, while
the remaining four agar-lytic fractions obtained from A250-Por did not exhibit anti-oxidative activity. This phenomenon may suggest that anti-oxidative properties of AOLs originate
in polyphenols. Algal-oligosaccharide-lysates may have potential use as a health food. 相似文献
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Preparation of algal-oligosaccharide mixtures by bacterial agarases and their antioxidative properties 总被引:1,自引:0,他引:1
ABSTRACT: Algal-oligosaccharide-lysates (AOL), derived from six agars and four algal polysaccharide extracts (APE), were treated with 100–500 activity units (AU) of MA103-agarases or MAEF108-agarases, and their antioxidative properties evaluated. Soluble total polyphenols (TP) were between 462.2 ± 1.6 gallic acid equivalents (GAE, µg/mL) and 70.6 ± 17.4 GAE. The DPPH radical scavenging capacity of all AOL went from 68.3 ± 0.7% to 0.5 ± 0.1%. The ferrous ion chelating capacity of all AOL went from 93.1 ± 0.2% to 21.7 ± 0.9%. Evaluation of the H2 O2 scavenging capacity of all AOL was between 35.9 ± 5.4% and 0.1 ± 0.2%. The reducing power of all AOL went from 51.3 ± 2.6 to 3.2 ± 6.8 expressed as µg/mL ascorbic acid. In DPPH radical scavenging capacity, ferrous ion chelating capacity and reducing power etc., the AOL derived from the APE of Porphyra dentate (digested by 500 AU of MAEF108-agarases) were highest, in all test sets. However, the AOL derived from the APE of Monostroma nitidum (digested by 500 AU of MAEF108-agarases) had the highest H2 O2 scavenging capacity in all test sets. The order of antioxidative activity performance of all AOL treated in this experiment, by these four antioxidative methods, is as follows: ferrous ion chelating capacity > DPPH radical scavenging capacity > H2 O2 scavenging capacity > reducing power; this may be related to their polyphenols, small molecular weight polysaccharides or simple sugar constituents. In this study, it is demonstrated that various agarases derived from algal oligosaccharide mixtures possess good potential for use as a health food, due to their antioxidative capacity. 相似文献
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Antioxidant‐related parameters,digestive enzyme activity and intestinal morphology in rainbow trout (Oncorhynchus mykiss) fry fed graded levels of red seaweed,Gracilaria pygmaea 下载免费PDF全文
This study was conducted to investigate the effects of dietary red seaweed, Gracilaria pygmaea level on growth, antioxidant‐related parameters, digestive enzyme activity and intestinal morphology of rainbow trout (Oncorhynchus mykiss) fry. Five isocaloric and isonitrogenous diets were formulated to contain four G. pygmaea levels (30 (GL‐30), 60 (GL‐60), 90 (GL‐90) and 120 g/kg (GL‐120)), and a control diet was used, without inclusion of seaweed. Results of the feeding trial indicated that final body (FBW: 2.8–3.5 g) and specific growth rate (SGR: 4.8–5.2) were significantly improved when 60 g/kg G. pygmaea was supplemented in the diets. However, there was a significant reduction (p < .05) of final body weight (FBW) and specific growth rate (SGR) in fish fed 120 g/kg G. pygmaea. Protease activity was significantly lower in fish fed GL‐120 diet when compared to GL‐30 or control (p < .05). Lipase was significantly affected by dietary seaweed regardless its level of supplementation (p < .05). The inclusion of the Gracilaria in the diet led to evident changes in the fish antioxidant status with significant reduction of superoxide dismutase, glutathione peroxidase activity and lipid peroxidation products. The histological study demonstrated that all groups of fish displayed normal morphology of anterior intestine and pyloric caeca. Villi absorptive area in the anterior intestine of treatment groups GL‐90 and GL‐120 significantly decreased (p < .05). Overall, the results obtained in this study indicate that dietary G. pygmaea supplementation up to 90 g/kg improves growth performance in rainbow trout fry without compromising antioxidant responses and digestive function. 相似文献
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芋根江蓠(Gracilaria blodgettii)是江蓠属一种经济海藻,可作为琼胶工业原料和鲍鱼饲料,目前已经在中国南方池塘进行试验栽培。为了探讨适合其栽培的生态条件,文章分别测定了在不同温度(18 ℃、23 ℃、28 ℃、33 ℃和38 ℃)、不同盐度(13、18、23、28、33和38)和不同光照强度(3 000 lx、6 000 lx、9 000 lx和12 000 lx)的培养条件下,芋根江蓠藻体的相对生长速率(RGR)和生化组分的变化。结果表明,芋根江蓠适宜生长温度为23~38 ℃,最适温度为28~33 ℃;适宜盐度为18~38,最适盐度为23~33;适宜光照强度为6 000~9 000 lx,最适宜生长光照强度为9 000 lx。在最适的环境条件下,藻体具有较高的日相对生长速率(RGR),藻胆蛋白和可溶性蛋白(SP)的质量分数最高,过氧化物酶(POD)的活性及丙二醛(MDA)的质量摩尔浓度最低,受环境的胁迫最小。在生长状态、光合色素和抗氧化等方面,芋根江蓠具有适应高温和中、高盐度环境条件的特性。 相似文献