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1.
黄鳝血清甲状腺激素的检测与分析 总被引：1，自引：0，他引：1
邹记兴 《广东海洋大学学报》1999,19(3):17-19
用放射免疫测定法测定了４４条不同性别黄鳝（Ｍｏｎｏｐｔｅｒｕｓ ａｌｂｕｓ Ｚｕｉｅｗ）血清总甲状腺激素Ｔｈｙｒｏｘｉｎｅ Ｔ３,Ｔｒｉｉｏｄｏｔｈｙｒｏｎｉｎｅ Ｔ４）含量。结果表明：（１）５～９月雄性Ｔ３含量一直较高。雌性５～６月Ｔ３含量比雄性和兼性低,７月以后升至兼性持平,８～０月达到与雄性持平,高于兼性含量,升幅较大,但差异不显著（Ｐ〉０．０５）。（２）５～６月雄性Ｔ４含量稍高于其它性别,７月以后有所降低;雌性与兼性Ｔ４含量与变化趋势基本相同。（３）同性别Ｔ４含量比Ｔ３含量要低得多。甲状腺激素可能与性逆转关系不大,其作用在于促进代谢与生长。 相似文献
2.
试验了几种抗菌药物对马氏珠母贝幼虫的毒性，结果表明，几种抗菌药物对马氏珠母贝Ｄ型幼虫９６ｈ半数耐受浓度（９６ＴＬＭ＝９６ＬＣ５０）及安全浓度分别为：氯霉素４５．４×１０－６、４．５×１０－６；红霉素５３．０×１０－６、５．３×１０－６；呋喃西林６４．１×１０－６，６．４×１０－６土霉素、百炎净、硫酸链霉素、青霉素Ｇ钠均大于１００×１０－６及１０×１０－６。但若以幼虫活力、摄食率、日生长率的变化作为观察指标，则这些药物的９６ＴＬＭ及安全浓度分别落在下述区间内：土霉素（３８～６７）×１０－６、（３．８～６．７）×１０－６；百炎净（５２～６７）×１０－６、（５．２～６．７）×１０－６；硫酸链霉素（２５～３８）×１０－６、（２．５～３．８）×１０－６；青霉素Ｇ钠仍大于１００×１０－６及１０×１０－６。下列药物在一定浓度下对幼虫的生长有明显的促进作用：青霉素Ｇ钠，百炎净（１３～３８）×１０－６；呋喃西林１３×１０－６。 相似文献
3.
在水温为２１．４℃—３１．２℃，盐度为２７．２‰—３６．３‰的环境条件下，进行了企鹅珍珠贝培育附壳珍珠的研究。经２８７天的育珠，成活率８７．５％。在收获的１５个母贝中，植入直径为７～１０ｍｍ的珠核４７粒，佛像模型２个；收获附壳珍珠４０颗，佛像２个，留核率达８５．７％。其中商品珠３５颗，商品珠率为８３．３％。在商品珠中，珠色为银白色的１６颗，占４５．７％；金黄色的１６颗（包括１佛像），占４５．７％；污斑珠３颗，占８．６％。珍珠直径超过１１ｍｍ的有５颗，１０．０～１０．９ｍｍ的有１９颗，９．０～９．９ｍｍ的有９颗，８．０～８．９ｍｍ的仅１颗。抽测珍珠５颗，珠层厚度最大者８６２．５μｍ，最薄者５６２．５μｍ。 相似文献
4.
李超 《成都信息工程学院学报》1995,(2)
用青藏高原５个站从１９５６～１９８６年共３１年的０．８ｍ地温距平，计算了秋季（９～１１月）的地温异常，同时考虑了我国汛期（４～９月）及夏季（６～８月）的降水相关，发现两者相关很好。不同部位的高原地温异常对我国降水关系的区域是不相同的。本文为中国汛期降水预报提供了依据。 相似文献
5.
李绍卿 《地球科学与环境学报》1995,(4)
本文研究了鲁米诺－高碘酸钾－钒体系产生化学发光反应，建立了测定痕量钒新的化学发光法。在ＥＤＴＡ为活化剂存在下，方法的检出限为３×１９（－９）ｇ／ｍｌ，工作曲线响应浓度范围为１×１０（－８）～１×１０（－６）ｇ／ｍｌ，测定５×１０（－７）ｇ／ｍｌ钒的相对标准偏差为２．５％～３．０％之间。该法有很好的选择性，用于测定岩矿等物料中痕量钒可获得满意结果。 相似文献
6.
7.
早渐新世全球气候迅速发生了降温，对地球生物产生了重大影响。利用共存分析法对贵州盘州地区石脑组的早渐新世植物群古气候进行了定量重建。植物群大化石指示的古气候参数:年 均 温 （ＭＡＴ）为 １５．７～２１．９℃、最冷月均温（ＣＭＭＴ）为 ２．５～１６．７℃、最 热 月 均 温（ＷＭＭＴ）为 ２１．６～２８．１℃、年 均 降 雨 量（ＭＡＰ）为８２８．０～１９００．０ｍｍ、最湿月均降 雨 量（ＭＰｗｅｔ）为 １６０．０～３４３．０ ｍｍ、最旱月均降雨量（ＭＰｄｒｙ）为 ７．０～５４．０ｍｍ、最暖月均降雨 量（ＭＰｗａｒｍ）为１０５．０～１８０．０ｍｍ。孢粉化石指示的古气候参数:ＭＡＴ 为１１．５～２３．９℃、ＣＭＭＴ为－１．０～１６．７℃、ＷＭＭＴ为２３．０～２７．９℃、ＭＡＰ为８０３．０～１６１３．０ｍｍ、ＭＰｗｅｔ为１１６．０～２９３．０ｍｍ、ＭＰｄｒｙ为１７．０～５５．０ｍｍ、ＭＰｗａｒｍ为９４．０～１８０．０ｍｍ。植物群大化石和孢粉化石的共存分析结果都指示一种温暖的、湿润的亚热带气候，且具有较明显的季节变化，与现在我国东南部地区气候较相似。盘州地区现在气候与早渐新世气候相比，夏季变凉爽多雨。结合我国同时期的植物群古气候参数，结果说明我国早渐新世时气候随纬度升高变化并不大，其分带现象明显低于现在的气候纬度分带变化。 相似文献
8.
含水层沉积物是江汉平原地下水中砷的主要来源，沉积物地球化学特征对地下水的水化学具有重要控制作用。为查明江汉平原第四系沉积物中砷的垂向分布及赋存环境，在典型高砷地下水分布区内选取２个深钻（ＪＨ００２孔及 ＹＬＷ０１孔，深度分别为２３０ｍ 和２０１ｍ）采集沉积物样品进行了地球化学分析。结果表明全新统和上更新统含水层沉积物以黏土、粉土、淤泥质黏土、粉砂、细砂为主，指示着弱水动力的沉积环境；２个钻孔沉积物地球化学特征相似，ｗ（Ａｓ）＝２．０～２２．６ｍｇ／ｋｇ（平均９．０ｍｇ／ｋｇ），ｗ（Ｆｅ）＝１１．８～５５．０ｍｇ／ｇ（平均３７．８ｍｇ／ｇ），ｗ（Ｓ）＝０．１～２．１ｍｇ／ｇ（平均０．４ｍｇ／ｇ）。中、下更新统沉积物岩相变化较大，以砂和砾石居多，局部含有黏土夹层，指示着沉积时较强的水动力沉积环境；其中ＪＨ００２孔沉积物 ｗ（Ａｓ）＝２．７～１６０．５ｍｇ／ｋｇ（平 均４０．９ｍｇ／ｋｇ），ｗ（Ｆｅ）＝２０．１～１７９．５ｍｇ／ｇ（平均５０．５ｍｇ／ｇ），ｗ（Ｓ）＝０．１～１７．７ｍｇ／ｇ（平均４．９ｍｇ／ｇ）；ＹＬＷ０１孔沉积物砷、铁、硫质量分数均低于ＪＨ００２孔，ｗ（Ａｓ）＝５．２～５６．１ｍｇ／ｋｇ（平 均１６．２ｍｇ／ｋｇ），ｗ（Ｆｅ）＝１０．９～１１７．５ｍｇ／ｇ（平 均３６．４ｍｇ／ｇ），ｗ（Ｓ）＝０．３～７．８ｍｇ／ｇ（平均１．８ｍｇ／ｇ）。ＹＬＷ０１孔中、下更新统沉积物颗粒较ＪＨ００２孔更细，所处的水动力条件更弱，砷、铁、硫质量分数均低于ＪＨ００２孔，说明沉积历史环境影响着砷、铁、硫等元素的分布。沉积物地球化学数据聚类分析结果表明全新统和上更新统砷与铁具有显著的相关性，而中、下更新统沉积物砷与硫化物矿物紧密相关。结合不同深度含水层水化学特征差异指示上更新统含水层中含砷铁氧化物的还原性溶解导致浅层地下水中砷的富集，富硫的中、下更新统深层含水层中强还原环境下砷受到硫化物矿物的固定作用难以释放进入地下水中。 相似文献
9.
综合应用电子显微镜、扫描电镜、阴极发光、Ｘ衍射、稳定同位素分析和流体包裹体分析测试等技术，通过半定量化研究深入探讨了莺歌海盆地 ＸＦ１３区块黄流组储层中富 ＣＯ２ 和富烃类气两类气体充注对储层中碳酸盐胶结物形成的影响，结果表明:①靠近底辟的 ＸＦ１３Ａ、ＸＦ１３Ｂ井受到了晚期富 ＣＯ２ 热流体充注影响，促进了 溶 蚀作用（次生孔隙比例为３９．９％～５８．４％），但由于处于幕式半开放的封闭成岩体系中，溶蚀过程中形成的大量Ｃａ２＋ 、Ｍｇ２＋ 、Ｆｅ２＋ 等离子没有及时排出，这些离子重新化合沉淀形成大量晚期碳酸盐胶结物，使得碳酸盐胶结物体积分数（４．５％～１３．５％）和类型增多，进而破坏孔隙喉道，形成中孔 低 渗 储 层；②远 离 底 辟 的 ＸＦ１３Ｅ、ＸＦ１３Ｆ等井黄流组储层主要是早期烃类气充注，溶蚀作用较弱（次生孔隙比例为７．２％～２７．７％）且处于开放的酸性热液体系中，造成碳酸盐胶结物体积分数（１．０％～６．０％）和类型相对较少，形成中孔中渗储层。 相似文献
10.
几种抗菌药物对壳顶幼虫的毒性试验结果表明：（１）以９６ｈ平均日生长率作为药物对幼虫毒性的观察指标，求出日生长率仅为对照组一半时的药物浓度（９６ＴＬＭ）及安全浓度（ＳＤ）如下：氯霉素６９×１０－６、６．９×１０－６；呋喃西林７２×１０－６、７．２×１０－６；百炎净７７×１０－６、７．７×１０－６；红霉素９７×１０－６、９．７×１０－６；硫酸链霉素４８×１０－６、４．８×１０－６；青霉素钠大于１００×１０－６、１０×１０－６。（２）１３×１０－６的呋喃西林、１３×１０－６的红霉素、１３×１０－６的青霉素钠对幼虫生长均有促进作用。（３）各试验组随药物浓度递增，幼虫活动逐渐被抑制；摄食率及眼点率逐渐下降。高浓度红霉素对摄食的抑制作用最强。 相似文献
11.
We collected Vimba vimba throughout the spawning season (mid April to mid June, 2007) in Gorgan Bay (south-western Iran) and investigated its age,
growth, and reproductive traits. The maximum age was 5+ years. Both sexes grew allometrically (positive for males: b=3.140 9 and negative for females: b=2.791 4). The von Bertalanffy growth functions were described by the formulae L
t
=32.565(1-e−0.184(t+0.530)) for males and L
t
=35.950(1-e−0.179(t+0.529)) for females. The overall sex ratio was balanced, but males were predominant in the smaller size classes and females in the
larger size classes. Based on the gonadosomatic index (GSI) values, spawning appears to occur between late April and late
May in the bay. The highest mean GSI was 6.44 for males in early May and 20.36 for females in late April. Absolute fecundity
varies from the minimum of 5 436 eggs for age 3+ fish to the maximum of 36 141 eggs for age 5+ fish. Fecundity was also positively correlated with fish size (length and weight). Egg diameter ranged from 1.05 to 1.70
mm in the mean of 1.42 mm. There was no correlation between female size and ova diameter. 相似文献
12.
东太平洋赤道公海茎柔鱼生物学特性 总被引：1，自引：0，他引：1
根据2013年4~6月在赤道公海探捕期间采集茎柔鱼样本,研究赤道公海茎柔鱼渔业生物学特性。结果表明,不同性别、不同月份,茎柔鱼胴长和体质量组成不同。雌、雄性样本的胴长范围分别为93~495 mm和94~406 mm,优势胴长组分别为260~340 mm和240~320 mm,分别占样本总数72.53%和70.26%;雌、雄性样本体质量范围分别为25~3 900 g和33~2170 g,优势体质量组分别为400~1 200 g和200~1 000 g,分别占样本总数82.71%和87.82%。雌、雄性茎柔鱼净体质量比例分别介于31.69%~80.51%和37.05%~81.35%之间,平均值分别为60.45%和62.73%。协方差分析表明,茎柔鱼胴长与体质量、胴长与净体质量的生长均存在性别间差异,胴长与体质量的生长都最适合用幂函数表示,而胴长与净体质量的生长,雌、雄性样本分别最适合用幂函数和指数函数表示。不同月份茎柔鱼性别比例构成不同,4月、5月和6月性别比例分别为1.87∶1、1.61∶1和1.17∶1,全部样本的性别比例为1.61∶1。不同月份茎柔鱼性腺成熟度的组成不同。不同性别、不同月份间茎柔鱼胃含物等级组成存在差异。 相似文献
13.
Raphael Cezar Grabowski Maria Lucia Negreiros-Fransozo Antonio Leão Castilho 《中国海洋湖沼学报》2016,34(1):125-135
The predictability of certain environmental factors that affect the life cycle of the seabob shrimp Xiphopenaeus kroyeri (Heller, 1862) was evaluated in a study of its reproductive biology in an area adjacent to Babitonga Bay, State of Santa Catarina, Brazil. Monthly sampling was conducted from July 2010 through June 2011 at depths of 5, 8, 11, 14, and 17 m. 76 004 individuals were obtained, with a pronounced peak in absolute abundance in austral autumn (34 208), coinciding with the annual closed season from March to May. Grain size composition of the sediment showed the closest relationship to the distribution of individuals (multiple linear regression, P <0.05), related to their burying habit. The observed correlations between the abundance of reproductive males (bearing spermatophores) and females with spent gonads (cross-correlation, P <0.05), and between reproductive males and reproductive females (with a 1-month lag) suggest that the peak of reproductive males preceded the peak of female ones. This result agrees with the pattern expected for females, which copulate in post-ecdysis (spent gonads). Spawning seemed to take place at greater depths, as evidenced by the concentration of reproductive females in these areas. The reproductive activities observed here confirm that this species follows a tropical/subtropical reproductive pattern, spawning continuously throughout the year, with the highest peaks in spring and autumn. The data indicate that the juvenile recruitment period observed in August-September resulted from the reproductive output noted in April–May. Additionally, the reproductive period recorded in November led to the juvenile peak observed in March–May. 相似文献
14.
研究了大亚湾网箱养殖水体中细菌的数量动态,以探讨其变化规律与鱼病的关系。结果表明:总细菌、弧菌的数量变化各异,网箱内、网箱外和对照海区细菌数量分布与变化不同。养殖区异养细菌丰值期在4-5月份,5月份最高;网箱水体弧菌的丰值期在6-11月,最高在8月;网箱外丰值期在7-9月,最高在8月,对照海区最高值在9月,其他时间变化不大。无论是异养菌还是弧菌,细菌值大小顺序为网箱内、网箱外、对照海区。弧菌数量与部分环境因子相关性较为密切,但相关程度随不同空间而不同,可能受其他环境条件影响。弧菌的高值期与弧菌病的流行期相吻合,鱼体受伤或其他原因引起细菌感染也会使水体中细菌数量升高。 相似文献
15.
Wang Peilie 《中国海洋湖沼学报》1985,3(1):37-47
Minke whales caught in the Yellow Sea range from 4.16 m to 8.60 m in length with an average length of 6.93 m for the female
and 6.14 m for the male. Sex ratio of the female is 74.3%. The pregnancy ratio of all sexually matured females is 65.8%. The
minimum size of the pregnant whale observed is 6.60 m in length. Females having a body length of more than 7 m long are all
sexually matured.
According to the studies on the embryos obtained from the females caught in the northern Yellow Sea, there is only one breeding
season each year. Mating mostly occurs from July through September, and the length of pregnancy is ten to eleven months with
the peak of calving from May through July. Most females breed one calf each time, only two cases with twins. Sex ratio of
female fetus is 56.6%, and the newly born calf measures 250–270 cm in body length.
This paper was published in Chinese inOceanologia et Limnologia Sinica
13 (4): 338–345. 相似文献
16.
《中国海洋大学学报(英文版)》2016,(2)
In this study,we investigated the community structure of crustaceans(decapod and stomatopod) inhabiting the sandy mud bottoms of Laizhou Bay(northeastern China) monthly from May 2011 to April 2012.Investigation was stopped from December 2011 to February 2012 because of the extreme weather and sea ice.A total of 205,057 specimens belonging to 31 species(shrimp,15;crab,15;and stomatopod,1) were collected in 148 hauls.From 2011 to 2012,Oratosquilla oratoria was the dominant biomass species(47.80%),followed by Charybdis japonica(15.49%),Alpheus japonicas(12.61%),Portunus trituberculatus(6.46%),and Crangon spp.(4.19%).Crangon spp.was the most dominant species by individual(32.55%).O.oratoria was the most-frequently encountered species(81.76%),followed by Palaemon gravieri(70.95%),C.japonica(65.54%),A.japonicas(62.16%),and P.trituberculatus(54.73%).The biomass density increased from August to September 2011 and decreased from March 2012 to April 2012.The dynamics of the ecological indices evolve in a similar manner,with high values of diversity and evenness and rich species from May to June 2011 and low values from September to October 2011.O.oratoria,C.japonica,and P.trituberculatus differed by biomass data between groups I(samples obtained from September to October 2011) and II(samples in other months).These species contributed more than 70% to the similarity of the crustacean community structure.Furthermore,the subsets of environmental variables that best matched the crustacean-assemblage structure were as follows:water depth(WD) in summer(June to August);sea surface temperature(SST),dissolved oxygen(DO),and WD in autumn(September to November);and DO,salinity,and WD in spring(March to May).The calculated correlation coefficients and significance level were higher in the period of July to August 2011 than in other months.Comparing 2011 to 2012 with 1982 to 1983,the species composition remained stable.However,the dominant species changed significantly.High value and large species,such as F.chinensis,P.trituberculatus,and T.curvirostris,have been replaced by low value and small species(i.e.,Crangon spp.,P.gravieri,and C.japonica). 相似文献
17.
双棘黄姑鱼血清性类固醇激素的周年变化 总被引：1，自引：0，他引：1
采用放射免疫法(RIA)测定双棘黄姑鱼(Nibea diacanthus)血清性类固醇激素的周年变化。结果表明:雌鱼血清雌二醇(Estadiol-17β)浓度一年出现两次峰值,均在成熟产卵前一个月,即4月[(338±59)pg/mL]和9月[(296±48)pg/mL];血清睾酮(T)浓度在卵黄发生期急剧上升,并在卵巢成熟期达到最高值,分别是5月(2.506±0.262 ng/mL)和10月份(2.268±0.243 ng/mL),分别在血清雌二醇浓度两次峰值出现1个月之后,因此,雌鱼的血清雌二醇浓度和血清睾酮浓度均与性腺发育相关。雄鱼血清睾酮浓度的两次峰值均出现在性腺已发育成熟的5月份(2.307±0.792 ng/mL)和10月份(2.286±0.607 ng/mL),与性腺发育有明显的相关性;而血清雌二醇浓度全年维持在一个相对稳定的水平,与雄性性腺发育相关性不明显。 相似文献
18.
鞍带石斑鱼人工繁殖及胚胎发育研究 总被引：2，自引：0，他引：2
为建立鞍带石斑鱼(Epinephelus lanceolatus)人工繁殖技术,研究了鞍带石斑鱼亲鱼培育、催产及胚胎发育过程。根据性腺检查及催产结果,判定鞍带石斑鱼在广东的繁殖季节为每年的7-9月份,产卵水温在28~31℃。使用10~12尾雌鱼和3尾雄鱼搭配进行催产实验,亲鱼未出现发情和追尾现象,虽能产卵但均未受精,通过人工授精可得受精卵。对鞍带石斑鱼胚胎发育进行了观察,详细描述从受精卵到初孵仔鱼的28个具体发育时期的形态特征和发育时间,结果表明,将鞍带石斑鱼胚胎发育划分为卵裂期、囊胚期、原肠胚期、神经胚期和器官形成期。在水温(27±0.5)℃、盐度31.0、pH 7.8的海水中,鞍带石斑鱼胚胎历时25 h 40 min完成整个胚胎发育孵化出膜。 相似文献
19.
Observation data from a cruise in the Nansha Islands, in May to June 1990, December, 1993, September to October 1994, and July, 1999, respectively, were used to develop the method presented here to indicate the existing strength of the dissolved oxygen maximum in the vertical distribution of Nansha Islands waters. Its seasonal variation and regional distribution are discussed in this paper. Analysis results showed that the distribution of the strength of dissolved oxygen maximum (DOmax-DOsur) was closely related to the upper layer circulation and the bioactivity of Nansha Islands seawater. 相似文献
20.
刘天仇 《中国地理科学(英文版)》1995,5(4):344-354
ＳＴＵＤＩＥＳＯＮＷＡＴＥＲＳＴＡＧＥＦＬＵＣＴＵＡＴＩＯＮＯＦＹＡＭＺＨＯＬＡＫＥＩＮＸＩＺＡＮＧＬｉｕＴｉａｎｃｈｏｕ（刘天仇）（ＴｉｂｅｔａｎＢｕｒｅａｕｏｆＷａｔｅｒＲｅｓｏｕｒｃｅａｎｄＨｙｄｒｏｌｏｇｉｃａｌＳｕｒｖｅｙ，Ｌｈａｓａ３５０... 相似文献