FFECTSOFTEMPERATUREANDCa~(2+)ONTHELARVALDEVELOPMENTOFTHEDECAPODACRUSTACE     

黄勃  堵南山  赖伟 《中国海洋湖沼学报》2001,(3)

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｉｍｐｏｒｔａｎｔｅｎｖｉｒｏｎｍｅｎｔａｌｆａｃｔｏｒｓａｆｆｅｃｔｉｎｇｇｒｏｗｔｈａｎｄｄｅｖｅｌｏｐｍｅｎｔｏｆＥｒｉｏｃｈｅｉｒｓｉｎｅｎｓｉｓｌａｒ ｖａｅａｒｅｓａｌｉｎｉｔｙａｎｄｗａｔｅｒｔｅｍｐｅｒａｔｕｒｅ.ＤｉｆｆｅｒｅｎｔｇｒｏｗｔｈａｎｄｄｅｖｅｌｏｐｍｅｎｔｓｔａｇｅｓｏｆＥｒｉｏｃｈｅｉｒｓｉｎｅｎｓｉｓｒｅｑｕｉｒｅｄｉｆｆｅｒｅｎｔｔｅｍｐｅｒａｔｕｒｅａｎｄｓａｌｉｎｉｔｙ (ＩｎｇｌｅａｎｄＡｎｄｒｅｗｓ,1 976) .Ｃａ2 +ｃｏｎｔｅ…  相似文献   

茶树冠层光谱特征及混合像元模拟研究     

黄传印  陈文惠 《福建地理》2014,(2):82-87

准确提取端元并确定像元中端元组分和丰度是提高遥感分类精度的基础和前提。本研究根据福建省多数茶园特点,从对地观测角度将茶园分为垄前冠面、垄后冠面、沟中阴影面和沟中光照面4种端元,并测定各类端元光谱特征。根据光线入射方向和地形参数计算茶园中任意端元组合面的丰度,利用几何光学模型进行组分光谱混合模拟,最后把模拟结果与实测结果相比较。研究结果发现,模拟和实测的光谱曲线很接近,光谱的反射峰、吸收谷位置基本吻合,总体精度在85%以上,说明采用组分合成法模拟茶园光谱是可行的。  相似文献   

喂食当归多糖对点带石斑鱼非特异性免疫力和抗病力的影响     

王庆奎  邢克智  赵海运  陈成勋  毋占勇  马甡 《中国海洋大学学报(自然科学版)》2012,(9):15-21

在饵料中添加0、500、3 000mg/kg的当归多糖(ASP)喂食点带石斑鱼(Epinephelus malabaricus)(初始体重(158.64±2.14)g),分别在喂食4和8周后取样,研究ASP对点带石斑鱼非特异性免疫力和抗病力的影响。结果表明,ASP能显著提高血液白细胞吞噬率和血清LZM活力(P<0.05),对血清一氧化氮(NO)、体表黏液溶菌酶(LZM)活力和抗菌活力无显著影响。ASP能促进头肾白细胞增殖、呼吸爆发活力和吞噬活力,降低用迟缓爱德华菌(Edwardsiella tar-da)攻毒后试验鱼的累积死亡率,3 000mg/kg组累积死亡率低于500mg/kg组,连续喂食ASP 8周的保护效果优于4周。研究表明,用含ASP 3 000mg/kg的饵料连续喂食点带石斑鱼8周能有效提高其非特异性免疫力和抗病力。  相似文献   

Water quality, nutrient budget, and pollutant loads in Chinese mitten crab (Eriocheir sinensis) farms around East Taihu Lake   总被引：2，自引：0，他引：2  

�̴���  ��Т��  �ƺ���  ����Ӯ  ҶԪ��  ʩ�½� 《中国海洋湖沼学报》2012,30(1):29-36

To understand the factors causing frequent outbreaks of harmful algae blooms in the Taihu Lake, China, we studied water quality and nutrient budget in Chinese mitten crab (Eriocheir sinensis) farm ponds in the eastern part of the lake from November 2007 to December 2009. We estimated the nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) loads. Materials input and output ponds, water exchange, and applied management practices of 838.5-hm2 crab ponds were surveyed using questionnaires. Water quality of 12 ponds, which were located no more than 2 km from East Taihu Lake, were monitored. The results show that water quality in the crab ponds was better than reference data. Feeds, including corn seed, commercial feed, trash fish, and gastropod, were the major sources of N and P input in the crab ponds, contributing 88.7% and 94.9%, respectively. In total, 60.5% of N and 37.3% of P were sequestered by macrophytes, and only 15.7% and 8.5% of them were discharged as effluent. The net loads of N and P in effluent were 16.43 kg/hm2/cycle and 2.16 kg/hm2/cycle, respectively, while the COD load was -17.88 kg/hm2/cycle. This indicated that crab farming caused minor negative impact on the trophic status of the lake area, which was attenuated by macrophytes. However, wastewater purification is still necessary in crab faming.  相似文献   

Effects of brown fish meal replacement with fermented soybean meal on growth performance, feed efficiency and enzyme activities of Chinese soft-shelled turtle, Pelodiscus sinensis     

Yurong Zou  Qinghui Ai  Kangsen Mai  Wenbing Zhang  Yanjiao Zhang  Wei Xu 《中国海洋大学学报(英文版)》2012,11(2):227-235

A 120-day feeding experiment was conducted to investigate the effects of partial replacement of brown fish meal (BFM) by fermented soybean meal (FSBM) in diets of Chinese soft-shelled turtle (Pelodiscus sinensis). The turtles (initial mean body weight, (115.52 ± 1.05) g) were fed with three experimental diets, in which 0%, 4.72% and 9.44% BFM protein was replaced by 0%, 3% and 6% FSBM, respectively. Results showed that the feeding rate (FR), specific growth rate (SGR) and feed efficiency ratio (FER) of turtles fed with the diet containing 3% FSBM were not significantly different from the control group (0% FSBM) (P > 0.05). However, FR, SGR and FER of turtles fed with the diet containing 6% FSBM were significantly lower than those of the control group (P < 0.05). No significant differences were observed in the activities of serum glutamic-oxalacetic transaminase and glutamicpyruvic transaminase among dietary treatments (P > 0.05). However, the uric acid concentration in turtles fed with the diet containing 3% or 6% FSBM was significantly lower than that in the control group (P < 0.05). There were no significant differences in the activities of lysozyme, alkaline phosphatase and total superoxide dismutase among dietary treatments (P > 0.05). The results suggested that FSBM could replace 4.72% BFM protein in turtle diets without exerting adverse effects on turtle growth, feed utilization and measured immune parameters.  相似文献   

中华鳖(Pelodiscus sinensis)EST-SSR标记与生长性状相关性分析     

张群英  黄鹤忠  袁文成  李文龙  雍福和  徐雪英  张平 《海洋与湖沼》2013,44(6):1654-1660

采用中华鳖转录组测序方法开发了一系列EST-SSR引物, 对60 只中华鳖(Pelodiscus sinensis)的遗传多样性和标记-性状相关性进行研究, 结果表明, 15 对EST-SSR引物扩增结果达到了高度多态水平, 平均的有效等位基因数、期望杂合度和多态性信息含量分别为2.7633、0.5961 和0.539177。C8387位点分别与体长、体重、背甲长和裙边宽显著相关(P<0.05)和极显著相关(P<0.01), CC型、AB型分别为4种性状的优势、劣势基因型; C211位点分别与体重、背甲长和裙边宽呈极显著相关(P<0.01)和显著相关(P<0.05), 其中等位基因C与体重呈负相关, CC 型是裙边宽、背甲长性状的劣势基因型, 而BB型和AB型分别是裙边宽和体重的优势基因型; C5670位点与体重和背甲长分 别呈极显著相关(P<0.01)和显著相关(P<0.05), 其中BB型和AA型分别是体重和背甲长的优势、劣势基因型; C1312 和C13038位点均与体重、背甲长极显著相关(P<0.01), 且C1312上的BC型、C13038上的BB型分别是中华鳖体重、背甲长性状的优势基因型。  相似文献   

青蛤的繁殖周期   总被引：3，自引：0，他引：3  

曾志南  李复雪 《热带海洋学报》1991,(1)

青蛤Cyclina sinensis采自福建漳浦佛昙湾。依据青蛤生殖细胞的发育规律,把生殖腺发育过程分为五期:增殖期、生长期、成熟期、排放期和休止期。青蛤怀卵量与个体体积存在线性关系:F=0.6046 0.1266V。根据青蛤肥满度、生殖腺指数和性成熟率等指标的周年变化规律,并结合性腺组织切片观察结果,认为青蛤繁殖期在9—12月,其中9月下旬至10月中旬为繁殖盛期。文中还就水温与青蛤繁殖期的关系进行了讨论。  相似文献   

编码中华绒螯蟹蜕皮抑制激素基因的eDNA片段克隆和序列分析   总被引：7，自引：5，他引：7  

王在照  相建海  崔朝霞 《海洋与湖沼》2002,33(4):432-438

于 2 0 0 0年 3月提取中华绒螯蟹眼柄总RNA ,以此为模板 ,根据日本对虾的神经肽Pej SG Ⅳ设计兼并引物 ,进行RT PCR扩增 ,在适宜的反应条件下 ,获得一特异性的产物 ,将该片段克隆到载体中进行测序。结果表明 ,中华绒螯蟹特异性cDNA片段由 2 1 3个碱基组成。在生物信息数据库中查找由该cDNA推定的氨基酸序列的相似序列 ,可以发现有大量甲壳动物的CHH家族神经肽与它相似。在所有相似序列中 ,甲壳动物的蜕皮抑制激素 (MIH)与它的相似度最高 ,这一结果提示由中华绒螯蟹的眼柄特异性cDNA片段推定的氨基酸序列可能是它的MIH片段。  相似文献   

Diet of harbour seals and great cormorants in Limfjord, Denmark: interspecific competition and interaction with fishery     

Andersen  Signe M.; Teilmann  Jonas; Harders  Pernille B.; Hansen  Else H.; Hjollund  Dorthe 《ICES Journal of Marine Science》2007,64(6):1235-1245

  相似文献   

荧光标记微卫星分析人工饲养中华绒螯蟹的遗传多样性   总被引：5，自引：1，他引：5  

朱泽远  王亚菊  施用晖  乐国伟 《中国海洋大学学报(自然科学版)》2007,37(4):591-596

分析中华绒螯蟹的遗传多样性，采集来自无锡、苏州和上海人工养殖样品102个，运用毛细管电泳检测荧光标记（FAM或HEX）的10个中华绒螯蟹微卫星DNA位点。在所有的3个群体中，单一位点等位基因数从15～42个，平均值为22．9；多态信息含量（PIC）和有效等位基因数（E）分别高达0．826和7．699。结果表明10个位点均为高度多态位点，中华绒螯蟹人工养殖群体具有较高的遗传多样性。欧氏遗传距离、遗传相似性和群体各亚群体内固定系数（Fst）平均值分别为0．439，0．825和0．099，结果显示不同的人工养殖群体之间也存在较大的遗传多样性。除上海群体在同步突变模式（SMM）下，近期不会有瓶颈（P=0．35）；所有群体在SMM和无限等位基因模式（IAM）下均有显著或极显著的瓶颈（P〈0．01或0．05），结果说明科学的品种保护计划的迫切性。本研究首次选择遗传标记微卫星DNA评估中华绒螯蟹的遗传多样性，并采用高精度的毛细管电泳检测技术，将对中华绒螯蟹的品种保护和合理利国提倡科学依据。  相似文献