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《养殖与饲料．饲料世界》2020,(3)
河蟹养殖在我国养殖行业中有着很重要的地位,但目前河蟹养殖过程中还存在着一些问题,为了促进我国河蟹养殖业的发展,本文介绍了高温对河蟹养殖的危害:使河蟹生长速度变慢、病害增加,使养蟹水体水草死亡腐烂、水质降低,使蟹塘发生虫害;提出了防治措施:保持均衡营养、增强河蟹的体质,维护良好水质、确保健康的生长环境,重视底质改良、降低池塘有毒物质含量,加强对蟹塘虫害发生的防控。 相似文献
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《养殖与饲料．饲料世界》2015,(11)
中华绒鳌蟹又名河蟹,是我国特有的水产珍品,随着我国水产品养殖业的飞速发展,各类养殖区域都开始养殖中华绒鳌鳖,养殖的产量也是逐年提高,随着河蟹各种养殖模式的产生,河蟹的营养源也从纯人工模式转换到以人工添加饲料为主的营养源。河蟹以其高营养价值吸引了大量的从业人员进行养殖,本文依据快速发展的河蟹养殖业对中华绒鳌蟹的营养需求进行了详细的探讨和研究。 相似文献
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大规格河蟹的养殖技术 总被引：1，自引：0，他引：1
河蟹以其营养丰富,肉味鲜美而深受国内外广大消费者的青眯.目前河蟹已成为各地的主要水产养殖品种,河蟹养殖业已由追求产量的"大养蟹"向以质量效益为中心的养大蟹和养"生态蟹"转变. 相似文献
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中华绒螯蟹（俗称河蟹）是我国特有的淡水养殖珍品，它以其独特的风味和高营养价值享誉中外，了解和掌握河蟹的营养需求，对研制和开发适合河蟹生长需要的饵料，推进河蟹养殖水平再上新台阶是十分必要的。 相似文献
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中华绒鳌蟹(俗称河蟹)是我国特有的淡水养殖珍品，它以其独特的风味和高营养价值享誉中外。了解和掌握河蟹的营养需求，对研制和开发适合河蟹生长需要的饵料，推进河蟹养殖水平再上新台阶是十分必要的。 1 蛋白质和氨基酸 1.1 蛋白质 相似文献
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本试验以初始体重为(0.042±0.002)g的拟穴青蟹仔蟹为研究对象,以鱼油和大豆油(1∶1)为脂肪源,配制脂肪水平分别为1.93%、3.95%、6.35%、8.14%、10.54%、12.30%、14.22%(实测值)的7种等氮等能试验饲料,养殖期为3周,用以研究饲料脂肪水平对拟穴青蟹仔蟹生长性能、体组成及消化酶活性的影响。每100只拟穴青蟹仔蟹为1个重复,每3个重复饲喂1种试验饲料。结果表明:1)饲料脂肪水平对拟穴青蟹仔蟹的增重率和特定生长率有显著影响(P0.05)。随着饲料脂肪水平的升高,增重率和特定生长率均呈先增后降的趋势,在饲料脂肪水平为8.14%时,增重率和特定生长率达到最大值。二次曲线回归分析确定当增重率达到最大值时,饲料脂肪水平为7.52%。拟穴青蟹仔蟹的成活率在饲料脂肪水平为14.22%的组最低,显著低于其余各组(P0.05)。2)饲料脂肪水平对全蟹中粗蛋白质和粗脂肪含量有影响显著(P0.05)。全蟹粗蛋白质含量随着饲料脂肪水平的升高先升后降,在饲料脂肪水平为8.14%的组全蟹粗蛋白质含量达到最高;全蟹粗脂肪含量则随着饲料脂肪水平的升高而持续上升,在饲料脂肪水平为14.22%的组全蟹粗脂肪含量达到最高。饲料脂肪水平对全蟹中水分和粗灰分含量没有显著影响(P0.05)。3)随着饲料脂肪水平的升高,拟穴青蟹仔蟹蛋白酶、淀粉酶和脂肪酶活性均呈先增后降的趋势,3种酶活性的最大值均出现在饲料脂肪水平为8.14%的组。由此得出,以增重率为评价指标,拟穴青蟹仔蟹饲料中最适脂肪水平为7.52%。 相似文献
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池塘虾蟹生态养殖微孔管道增氧高产高效养殖试验 总被引：3，自引：0，他引：3
利用微孔管道增氧技术,进行池塘虾蟹生态养殖试验。结果表明,在16675m2池塘中收获河蟹2800kg,平均单产达112kg/667m2,平均效益达7500元/667m2。微孔管道增氧技术对虾蟹养殖增产增效作用明显。 相似文献
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Survey and contrast radiographic studies of the cardiovascular and gastrointestinal systems of the American horseshoe crab (Limulus polyphemus) were undertaken using conventional and flouroscopic techniques. Normal gastrointestinal and cardiovascular structures were difficult to resolve on survey radiographs, but were well visualized with gastrointestinal follow through studies and angiography, respectively. All three contrast agents (iohexol, Gastrografin, and barium sulfate) used for the gastrointestinal studies varied minimally in their radiographic quality and transit times, and all appeared to be safe for use in the horseshoe crab. 相似文献
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Ensiled mixtures of seafood processing wastes and wheat straw were evaluated. Thirty-six crossbred wethers (average BW = 34 kg) were fed 1) a basal diet (hay and concentrate) alone, or a 1:1 ratio (DM basis) of basal and 2) ensiled fish waste plus straw (70:30, wet basis), 3) ensiled fish waste and straw (51:49), 4) ensiled crab waste plus straw (60:40), 5) ensiled crab waste plus straw (40:60), or 6) ensiled wheat straw (50% moisture). Dry molasses (5%) was included in all ensiled mixtures, and glacial acetic acid (16% vol/wt) was added to the crab waste mixtures. Among diets containing ensiled fish waste, DM digestibility was greater (P less than .01) for the diet containing silate with 70% fish waste than the diet containing 51% fish waste. There was no difference (P greater than .05) in DM digestibility between the two crab waste silages. Apparent digestibility of CP was greater (P less than .01) for diets containing fish than for those containing crab waste. Nitrogen retention (g/d) was positive for sheep receiving all diets but not different among treatments. Apparent absorption of P (g/d) was greater (P less than .01) by sheep fed fish waste silage diets than by those fed crab waste silage diets. Among seafood silages, DMI was greater (P less than .01) for sheep consuming the 60:40 than for those consuming the 40:60 crab waste silage diet and less (P less than .01) for sheep fed the 70:30 than for those fed the 51:49 fish waste silage diet. Seafood processing wastes potentially are valuable to ensile with crop residues for use as ruminant feedstuffs. 相似文献
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Fecundity, shell utilization, and crab and associated shell morphometries were investigated for the hermit crab Diogenes brevirostris collected from three intertidal sites in the eastern Cape. The relationship between crab fresh mass and egg number was linear. D. brevirostris was found to occupy 33 gastropod shell species of which Bumupena predominated on the rocky shore (8. lagenaria, 35,9%; B. cincta, 17,5%; B. pubescens, 16,5%) while Bullia was more commonly used near sandy shores (S. armulata, 4%; B. digitalis, 2,7%; B. rhodostoma, 2,5%). Although Oxysteie is common, it was hardly used by D. brevirostris (O. sinensis, 2,7%). Whereas shell type (Bumupena lagenaria, B. cincta, B. pubescens and Bullia rhodostoma) was found to have no significant influence on the crab length/mass relationships, significant differences were found between elevations but not slopes of the fresh mass/volume relationships (p < 0,05). B. rhodostoma was significantly different from all three species of Bumupena suggesting that small D. brevirostris occupy Bullia shells of a larger volume than a similar-sized crab occupying a Bumupena shell to compensate for the increased ‘dead space’ incurred with a high spire. Overall, there did not appear to be any selection towards low-spired (17 species, n = 264) or high-spired (15 species, n = 262) shell species, but there was when compared for each site (p < 0,01), indicating shell availability to be important. A good size correlation was found between 0. brevirostris and its associated shell suggesting that selection of available material and/or mutualism may occur. 相似文献
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中国鲎(Tachypleus tridentatus)基因工程抗菌肽的制备及其抗菌活性 总被引：3，自引：0，他引：3
从中国鲎血细胞RT-PCR扩增抗菌肽tachyplesins基因,经改造构建原核和真核表达载体pET-KRN、pPIC9-KRY,并分别在大肠杆菌DE3和毕赤酵母GSll5中诱导表达.用Tris-Tricine SDS-PAGE检测并进一步电洗脱纯化表达产物,经体外生物活性测定表明,表达产物KRN对大肠杆菌、金黄色葡萄球菌、枯草杆菌、伤寒沙门菌的抑菌环为25、22、25、16mm;MIC值为3.57、7.14、3.57、14.28mg/L.表达产物KRY对大肠杆菌、金黄色葡萄球菌、枯草杆菌、伤寒沙门菌和李氏杆菌的抑菌环为26、22、25、18、16mm;MIC值为1.57、3.14、1.57、6.28、6.28mg/L,对水霉的抑菌效果尤其显著,抑菌环达35mm. 相似文献
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Fish eggs, thought to be those of the liparid fish, Careproctus griseldea, were found In the gill chambers of several specimens of the stone crab, Lithodes tropicalls, caught In deep-water (-600 m) oil the South West African/Namibian coast (-24°46/S/13°28'E). The size class and quantity of crabs involved in this symbiotic relationship are discussed and some observations are made as to the diameter, number and maturity of the fish eggs removed from the crabs. 相似文献