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1.
旅游环境质量的好坏直接影响水利风景区水资源持续利用、水利工程安全、水生态环境保护、水文化传播甚至整个风景区的生存与发展,对旅游环境质量进行科学、全面的评价成为管理水利风景区的重要手段。通过运用层次分析法与模糊数学方法相结合的模糊综合评判方法,在构建水利风景区旅游环境质量评价指标体系的基础上,对冶力关国家水利风景区进行了评价,评价结果表明旅游环境总体较好,其中自然生态环境"很好",旅游资源和服务环境"较好",但水利工程特性、社会环境和信息环境等3大类环境评价结果为"一般"。从增加旅游活动的参与性、加强旅游服  相似文献   

2.
水文化是城市水利风景区的灵魂,也是提升城市水利风景区品质和丰富其内涵的必要途径。近年来,各地大力开展水利风景区建设,凸显地域特色的水文化建设已被视为水利风景区规划的首要内容。为了阐明水文化理念对水利风景区规划的重要性,探究水利风景区规划梳理和运用水文化资源,通过水利风景区规划技术手段传承水文化,基于当前水利风景区规划建设中存在的问题,以江苏昆山巴城湖水利风景区为例进行了以下研究:(1)在水文化与水利风景区的总体认知背景下,梳理巴城水文化资源,探究如何挖掘水文化资源价值;(2)从水文化资源保护和旅游项目内涵表现方面分析了巴城湖水利风景区规划困境;(3)基于巴城水文化资源布局和发展脉络,确定规划定位和和规划布局;(4)以湖城共生、水乡共融为目标,提出"红色科教、绿色体验、蓝色休闲、金色品质"四大主题旅游产品,以传承"水利文化、水乡文化、水城文化、水蟹文化"四大水文化精髓。  相似文献   

3.
介绍昆山明镜荡水利风景区建设规划、管理和发展等情况,为自然河湖型水利风景区的建设与发展提供借鉴。昆山明镜荡水利风景区位于昆山市锦溪镇,总面积约32km2,其中水域总面积达10.78km2。在南部水乡岸线整治初期,水工程建设考虑了水利景观建设,营造整体生态景观,提高水工程的审美价值。通过景区内锦溪现代农业生态园,将都市现代农业引入到水利风景区旅游中。将汪洋湖、明镜荡、长白荡、陈墓荡等纳入生态保护工作范围,拆除养殖围网,种植水生植物;迁离污染比较严重的企业。在湖泊岸线整治后的堆土表面种植绿化植物或铺设草垫;堤防护岸采用格宾网、自然护坡等形式。自然河湖型水利风景区的建设要重点突出水工程景观营造、水生态保护与修复。在落实景区规划的同时,要注重水资源保护规划、水土保持规划等专项同步编制;水文化展示馆要考虑游客的互动参与,增加知识性、互动性、趣味性和艺术性。  相似文献   

4.
基于GIS的大亚湾海域生态环境质量综合评价   总被引:1,自引:0,他引:1  
根据2005年5月的调查资料,设计了基于GIS的环境质量综合评价模型,从水体污染、初级生产力、生物资源等方面对大亚湾海域生态环境的质量状况进行了综合评价,并对环境质量的空间分布趋势进行了模拟和分析。结果表明,大亚湾海域环境质量综合指数为0.71±0.0568,处于"较好"水平。水体营养水平偏高和浮游植物生物量偏高、多样性偏低是目前大亚湾海域生态环境状况的主要特征。从环境质量的空间分布趋势来看,评价海域依综合指数的级别,划分为3个区域,质量很好区、质量较好区和临界区,分别占总评价海域面积的2.27%、93.41%和4.32%,其质量综合指数平均值分别为0.80±0.0015、0.71±0.0434、0.54±0.0304。  相似文献   

5.
<正>"欧洲丁高效养殖及苗种繁育技术研究"是我所承担的河南省科技发展计划项目,2013年我所和龙安区彰武水库特种水产养殖中心共同合作,对欧洲丁网箱养殖进行了改进和提高,探索出一个升级版的无公害高产高效养殖模式,现总结如下:一、材料与方法 1.水域环境条件网箱设置水域为彰武水库特种水产养殖中心水域,水库为国家级水利风景区,水  相似文献   

6.
新时期,在强调水资源可持续利用的总体战略目标下,水利事业已将水土资源的生态保护、娱乐利用、旅游观光作为发展方向和任务之一,把水利风景区的开发建设纳入了重要工作内容。水利风景区的开发目标具有多元特点,其规划具有很强的综合性和多重复合的跨学科特征,是水利风景旅游事业发展面临的重要课题。在阐述水利风景区开发的多元目标基础上,对其科学规划的意义、原则、编制要求及导则等方面进行研究,并明确提出基于水资源保护、自然与景观资源保护、生态环境修复等多元目标的水利风景区规划引导整体框架。  相似文献   

7.
基于多元目标的水利风景区开发规划引导性研究   总被引:2,自引:0,他引:2       下载免费PDF全文
新时期,在强调水资源可持续利用的总体战略目标下,水利事业已将水土资源的生态保护、娱乐利用、旅游观光作为发展方向和任务之一,把水利风景区的开发建设纳入了重要工作内容.水利风景区的开发目标具有多元特点,其规划具有很强的综合性和多重复合的跨学科特征,是水利风景旅游事业发展面临的重要课题.在阐述水利风景区开发的多元目标基础上,对其科学规划的意义、原则、编制要求及导则等方面进行研究,并明确提出基于水资源保护、自然与景观资源保护、生态环境修复等多元目标的水利风景区规划引导整体框架.  相似文献   

8.
围绕水库水生态环境建设,从遵循客观规律,让河道回归自然;划定三圈蓝线,保护水库水生态安全;加强水利风景区建设,打造水库生态环境靓点等几个方面进行了探讨.并提出了保证大力建设水生态环境的思想、政策、体制和行动上的措施.  相似文献   

9.
正高青县结合乡村旅游和风情周末,利用周末和五一""十一"期间,不间断举办各类休闲渔业活动,促进渔文化与乡村旅游结合。一是先后举办了五彩农业博览会"、大芦湖水库水源地、千乘湖渔业资源修复等增殖放流活动,放养滤食性鱼类近千万尾,保护了渔业资源,实现"以鱼养水""以水养鱼",既修复了水系生态,又增加了渔业资源。二是  相似文献   

10.
根据2016年兴化湾春季(3月)和秋季(10月)大型底栖生物调查数据,首次在兴化湾海域利用不同底栖生物指数(Shannon-Weaver指数H′、AMBI、M-AMBI)对底栖环境质量进行评价,并分析各指数的时空分布特征。通过三种指数评价结果比较以及分析各指数与沉积物、水质等环境因子间的关系来探究不同底栖生物指数在兴化湾海域的适用性。三种指数的评价结果在春季一致性较高,秋季差异性明显,M-AMBI和H′指数与环境因子特别是对氮、磷的相关性较好。M-AMBI指数的评价等级梯度和稳定性更好,是沉积物有机富集程度低、以敏感种为主、生物数量季节变化明显的兴化湾进行底栖环境质量评价的优选指数,春秋评价结果分别为良好与一般。底栖环境质量的时空分布特征与入湾河流、水产养殖活动和潮动力等因素关系密切。  相似文献   

11.
12.
The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic Ocean. The present findings reveal that the year (temporal factor), latitude and longitude (spatial factors), and major regular longline target species of albacore catches are significant for the standardization of bigeye tuna catch rates in the Atlantic Ocean. The standardized catch rates and distribution of bigeye tuna were found to be related to environmental and climatic variation. The model selection processes showed that the selected GAMs explained 70% of the cumulative deviance in the entire Atlantic Ocean. Regarding environmental factors, the depth of the 20 degree isotherm (D20) substantially contributed to the explained deviance; other important factors were sea surface temperature (SST) and sea surface height deviation (SSHD). The potential fishing grounds were observed with SSTs of 22–28°C, a D20 shallower than 150 m and negative SSHDs in the Atlantic Ocean. The higher predicted catch rates were increased in the positive northern tropical Atlantic and negative North Atlantic Oscillation events with a higher SST and shallow D20, suggesting that climatic oscillations affect the population abundance and distribution of bigeye tuna.  相似文献   

13.
Previously, we reported 10 PEGE types of 85 tilapia Streptococcus agalactiae(GBS), which shifted from Streptococcus iniae in China, by using PEGE method. Presently, larger and more representative tilapia GBS were isolated, for the ?rst time in China, to characterize their serotypes and genetic diversities more precisely than had done before. 168 GBS strains were distributed in ?ve provinces of China, in which Guangdong, Guangxi and Hainan were the major ones, holding36.9%(62/168), 37.5%(63/168) and 19.6%(33/168), respectively. Serotypes, Ia, Ib and III, were observed in these strains and the most predominant one was Ia(95.2%), which mainly distributed in Guangdong, Guangxi and Hainan. Ia initially occurred in 2009, it shoot up to 32.1% in 2010,but decreased to 16.1% in 2011 before went up to 45.2% in 2012. Ib sporadically occurred during2007–2011, III onlyoccurred in 2012. 14 different PFGE types, including 4 new types(N, O,P and Q), were observed, in which B, D, F and G were the predominant types, holding 83.9%(141/168) of the total GBS strains. Ia corresponded to 11 PFGE types(A–H, N–P), in which type D predominated(51%). Ib represented 3 genotypes(I, J and Q) and III harbored only 2genotypes(N and F). Type N and Fsynchronously presented in Ia and III. In summary, the genetic diversity of tilapia GBS varied by serotypes and changed with geographical locations and years.Although Iastillpredominated, new rareserotypeIII alreadyoccurred in China.  相似文献   

14.
Growth hormone (GH) and reproduction: a review   总被引:5,自引:0,他引:5  
Interaction between growth and reproduction occurs in many vertebrates and is particularly obvious at certain stages of the life cycle in fish. Endocrine interactions between the gonadotropic axis and the somatotropic axis are described, the potential role of GH being emphasised. A comparative analysis of these phenomena in mammals, amphibians and fish, suggests a specific role of GH in the physiology of puberty, gametogenesis and fertility. It also shows the original contribution made by studies on the fish model in this field of investigations.  相似文献   

15.
Protein and amino acid composition of the mantle of juvenile O ctopus vulgaris (Cuvier, 1797) during fasting for 27 days were determined. Average protein content of octopus mantle was of 711.19 ± 46.80 g kg?1 DW, and it decreased with increasing fasting days. The non‐essential amino acids content was higher (486.18 ± 11.08 g kg?1 protein) than essential amino acids (425.82 ± 9.15 g kg?1 protein) at the start of the experiment (unstarved animals). The results suggest that the amino acid profile of the mantle where the most abundant amino acids are Arg, His, Lys, Gly, Leu and Pro could indicate a prolonged fasting condition (>20 days) or poor nutrition of O . vulgaris. This study supports the idea of using mantle for metabolic needs of starved O . vulgaris suggesting that the degradation pathway of amino acids to pyruvate and tricarboxylic acid cycle intermediates was favoured contrary to the degradation pathway of ketogenic amino acids. Special considerations should be taken concerning Thr, Ile, Ser, Ala, Asx (Asp, Asn), Glx (Glu, Gln) (because of their fast intake) and Lys and His (due to their stable contents) during a prolonged period of fasting.  相似文献   

16.
In this experiment, a feeding trial was performed to determine the effects of fructooligosaccharide (FOS) on growth performance, digestive enzyme activity and immune response of Japanese sea bass, Lateolabrax japonicus juveniles (initial weight 38.3 ± 0.5 g), and the fish were examined following feeding with six levels of FOS (0, 0.5, 1, 2, 4 and 6 g/kg) for 28 days. Significant enhancement of weight gain (WG) and specific growth rate (SGR) was found in fish fed 1 g/kg FOS incorporated diets (p < .05), while the feed conversion ratio (FCR) in the 1, 2 g/kg FOS groups reduced significantly compared with the control (p < .05). Besides, the crude lipid in the 4, 6 g/kg FOS groups increased significantly compared with the control (p < .05). On the other hand, the erepsin and lipase activities significantly elevated in intestine of fish fed 2 g/kg FOS (p < .05) and the lysozyme activity in serum of fish fed 2 g/kg FOS were significantly higher than that in the control (p < .05). Moreover, the alkaline phosphatase activities in serum of fish fed 0.5, 1, 2 g/kg FOS were significantly higher than in control (p < .05). Regression analysis showed that the relationships between dietary FOS levels and either SGR, FCR, erepsin or lysozyme activities were best expressed by regression equations, and the optimal inclusion levels are 1.37, 1.80, 3.06, 3.11, 1.93 and 1.80 g/kg for SGR, FCR, erepsin, lipase, lysozyme and total superoxide dismutase activities, respectively. Overall, this study revealed that FOS incorporated diets could beneficial for L. japonicus culture in terms of increasing the growth, digestion and immune activities. Under the present experimental condition, the optimal supplementary level of FOS in the diet of L. japonicus is 1–3 g/kg.  相似文献   

17.
18.
Two gonadotropins (GtH; Qa and Qb) were purified by gel filtration and ion exchange chromatography from the pituitaries of Indian walking catfish (Clarias batrachus). The presence of GtH during purification was assessed by in vitro oocyte maturation and in vivo steroidogenic activity, and their identities were determined by elution profiles, molecular weight, biological activities and yield. The molecular weights of Qa and Qb were 37 and 42 kDa, respectively, and composed of distinct subunits (Qa: 20 and 14 kDa and Qb: 26 and 18 kDa). Polyclonal antibodies raised against Qa immunostained Qa, Qb and pituitary GtH cells. A competitive Qa‐ELISA was developed whose sensitivity was 6.25 ng mL?1 (1.25 ng well?1) with intra‐ (3.5%) and inter‐ (12.4%) assay coefficients of variation. Displacement curves parallel to the standard were obtained with plasma and pituitary extracts of catfish, Qb and carp GtHII. The assay was validated by measuring the plasma Qa levels after LHRH treatment and in relation to ovarian growth in the female catfish during different reproductive phases. Based on the results, Qa and Qb corresponded to fish LH and FSH respectively. The findings will increase the knowledge of the mechanisms controlling fish reproduction and identification of sensitive phases in fish in captivity for hormonal manipulation.  相似文献   

19.
The endemic, anadromous cyprinidChalcalburnus tarichi is the only fish species known to occur in alkaline Lake Van (Eastern Anatolia, Turkey). EightC. tarichi were maintained individually in Lake Van water (17 – 19°C; pH 9.8; 153 mEq·I–1 total alkalinity; 22 total salinity) and tank water samples analyzed for 24 h in 2 to 4 h intervals. At zero time, < 1µM ammonia was present and urea was undetectable in the tank water; at 24 h, total ammonia and urea made up 114±32 and 35±25µM, respectively. Over the experimental period, ammonia-N and urea-N excretion averaged 1041±494 and 607±169moles·kg–1 fish·h–1, respectively. The extent of urea excretion was highly variable between specimens. Uric acid excretion was not detectable.Urea was present at high concentrations in all tissues and plasma (25 – 35moles·g–1·ml–1) of freshly caughtC. tarichi; total ammonia content of the tissues was by a factor of 1.9 (liver) to 3.0 (brain) lower. High arginase activity (2.4±0.2 U·min–1·g–1) was detected in the liver ofC. tarichi but ornithine carbamoylphosphate transferase, a key enzyme of the ornithine-urea-cycle, was absent. Ureagenesis is likely through degradation of arginine and/or uricolysis. High glutamine synthetase activity (11±0.6 U·min–1·g–1) and low ammonia content in brain suggest that, like other teleosts,C. tarichi has an efficient ammonia detoxification in the brain, but in no other tissue.Nitrogenous waste excretion at alkaline pH is discussed. The ability ofC. tarichi to excrete high levels of ammonia at extremely alkaline pH is unique among teleosts studied so far. The mechanism of ammonia excretion under Lake Van conditions remains to be elucidated.  相似文献   

20.
Tetrahymena is a protozoan parasite, which infects guppy, Poecilia reticulata Peters, and causes substantial economical losses in commercial farms worldwide. Studies of guppy infected by Tetrahymena require standardized infection protocols. The LD50 for Tetrahymena infection of guppies by intraperitoneal (IP) injection was calibrated, and the level obtained was 946 parasites per fish. Guppy infection with Tetrahymena by immersion, imitating the natural route of infection via the integument, was studied under normal or stress conditions. Exposure to cold and netting (CNI) and to cold only (CI) followed by immersion exposure to 10 000 Tetrahymena per mL resulted in 22.5% and 19.2% mortality, respectively, as compared to 14.2% and 10% in groups that were netted only (NI) or non‐stressed (I). Histopathology revealed that immersion infection resulted in a systemic infection. Lysozyme levels, measured 3 weeks after infection, were significantly higher in the CNI group (288 μg per mg protein) compared with CI‐, NI‐ and I‐treated groups (94.5, 64 and 62.3 μg mg?1, respectively). There was no evident parasite immobilization activity in body homogenates, suggesting no development of acquired immunity. Re‐infection by IP injection revealed no increase in protection in any of the treatment groups, mortality range of 56.3–75%, higher than in the non‐exposed control (40.6% mortality).  相似文献   

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