共查询到19条相似文献，搜索用时 140 毫秒
1.
《广东海洋大学学报》2017,(1)
根据2009–2011年东太平洋海域长鳍金枪鱼延绳钓的生产数据,结合海洋遥感获得的表温(SST)和海面高度(SSH)的数据,采用外包络法,以投钩数、单位捕捞努力量渔获量(CPUE)为适应性指数,按月份分别建立基于SST和SSH的长鳍金枪鱼栖息地适应性指数(SI)。采用算术平均法(AMM)和几何平均法(GMM)获得基于SST和SSH环境因子的栖息地指数(HSI)综合模型,并以2012年各月生产数据进行模型验证。结果表明,基于两种HSI模型所得的长鳍金枪鱼栖息地综合指数不相同,通过算术平均法的HSI模型,当HSI为0.6以上时,渔获量占总渔获量的87.9%,通过几何平均法的HSI模型,当HSI为0.6以上时,渔获量所占比例为87.2%。算术平均法较GMM更适于东太平洋长鳍金枪鱼栖息地指数模型。 相似文献
2.
《广东海洋大学学报》2014,(4)
根据2010~2013年3-5月渔汛期间智利外海茎柔鱼生产统计数据以及海表面温(SST)、海表面盐度(SSS)、海表面高度(SSH)及叶绿素浓度(Chl-a)等海洋环境数据,以外包络法建立基于作业努力量和CPUE的各环境变量适应性指数(SI)。以SST作为建立SI的基准因子,采用算术平均法构建栖息地综合适应性指数模型(HSI),并选择最优栖息地指数模型,以用于茎柔鱼渔场预报,并利用2013年智利外海茎柔鱼生产数据进行验证。结果表明,以SST和SSS为因变量构建的HSI模型为最佳,且基于作业努力量的HSI模型要好于基于CPUE的HSI模型。以作业努力量为SI指标、基于SST和SSS为因子的HSI模型能较好预报智利外海茎柔鱼渔场。 相似文献
3.
对 2 0 0 0年 5～ 7月北太平洋中东部海域鱿钓探捕调查所获的不同深度海水温度和柔鱼渔获量等资料进行分析 ,结果表明在西经调查水域的 1 74°W和 1 71°W附近 ,1 0 0m ,2 0 0m和 3 0 0m水温分布均形成明显的暖水舌 ,其特征水温依次为 1 0～ 1 1℃ ,9～ 1 0°C及 8～ 9°C ;在东经调查水域 ,表层以下各层水温较往年有所偏低 1～ 2度。分析结果还表明 ,西经调查水域的中心渔场均处在暖水舌前锋一侧 ,中心渔场形成的水温指标为 :表层 1 3～ 1 4°C ,1 0 0m水层 1 0～ 1 1°C、2 0 0m水层 9～ 1 0°C及 3 0 0m水层 8～ 9°C ;在东经调查水域 ,调查期间没有形成中心渔场 ,这可能与深层水温偏低有关 相似文献
4.
水温变动对2009年西北太平洋柔鱼产量下降的影响 总被引：1，自引：0，他引：1
分布在西北太平洋的柔鱼是我国远洋鱿钓渔业的重要捕捞对象,近些年来其产量一直处在稳定的水平。然而,2009年8～10月旺汛期间在传统作业渔场(150°E～165°E、38°E～46°E)柔鱼产量出现大幅度下降,其日产量仅为正常年份的一半。为此,根据2007～2009年8～10月我国在西北太平洋鱿钓生产数据,以及产卵场表层水温,探讨2009年柔鱼产量下降及渔场变动的原因。研究表明,其产量出现下降的原因可能有2个:(1)柔鱼产卵场(20°N～30°N,130°E～170°E)黑潮大弯曲的发生,使得21℃等温线向南偏移,使得柔鱼资源补充量受到影响,从而使得渔汛期间柔鱼产量的下降;(2)旺汛期间(8～9月)传统作业渔场(42°N～46°N,150°E～165°E)的100m水层有一个明显冷水南下,分布位置为154°E～156°E,将传统作业渔场(150E～165°E)一分为二,向南的前锋(水温低于5℃)到达42°N,明显不同于正常年份,使得作业渔场的范围明显缩小,不适合柔鱼的集群,导致产量出现大幅下降。 相似文献
5.
2010年7月利用灯光罩网和延绳钓对南沙北部海域进行了初步的渔业资源调查,报道了该海域的鸢乌贼(Symplectoteuthis oualaniensis)和金枪鱼的渔获与分布状况。灯光罩网平均CPUE 63.90 kg/网,主要渔获物为鸢乌贼,占总产量的67.57%,平均胴长122 mm,质量89.6 g;延绳钓平均CPUE为18.19 kg/百钩,其中大目金枪鱼(Thunnus obesus)3.24 kg/百钩、短鳍斜齿鲨(Scoliodon Palasorrah)10.46 kg/百钩,渔获尾数较多的为帆蜥鱼(Alepisaurus ferox)和黑魟(Dasyatis atratus),分别占总数的39.13%和26.09%。提出南沙金枪鱼捕捞采用延绳钓与灯光罩网联合方式的建议。 相似文献
6.
<正>茎柔鱼(Dosidicus gigas)是头足类中个体最大、资源最丰富的种类之一[1],广泛分布于东太平洋的加利福尼亚(37°N)到智利(47°S)的海域中,在赤道附近可向西至125°W[1-4],有学者认为其分布范围在赤道附近可达到140°W[5]。20世纪90年 相似文献
7.
利用1/30°分辨率三维POM(Princeton Ocean Model)模式,以M2、S2、K1、O14大分潮作为潮汐边界条件,模拟南海西北部(105.5-115°E,16-23°N)海域正压潮,分析琼州海峡及其附近区域正压潮能通量分布特征。结果表明,研究海域内M2分潮和全日潮都是顺时针传入北部湾,然后自西向东通过琼州海峡,直至琼州海峡东口;计算所得穿过琼州海峡中部(110°E断面)能通量为M2,0.2GW或m1,0.47GW;穿过北部湾湾口(18.5°N断面)能通量为M2,1.0GW或m1,2.5GW;海南岛西部和琼州海峡处潮能耗散最强。 相似文献
8.
印度洋西北海域鸢乌贼9-10月栖息地适宜指数研究 总被引：2，自引：0，他引：2
印度洋西北部海域的鸢乌贼(Sthenoteuthis oualaniensis)具有一定的开发潜力,可作为商业性捕捞的对象,准确预报中心渔场可为指导生产提供依据。根据2003、2004年9～10月份期间我国鱿钓船在2°～24°N、57°～69°E海域的探捕数据,结合表温、盐度、海表面高度和叶绿素a,以CPUE作为适应性指数,利用算术平均法(AM)和几何平均法(GM)分别建立基于环境因子的综合栖息地指数模型。结果表明,9月份在栖息地指数(HSI)大于0.8的中心渔场作业次数比例超过24%,平均日产量在5.48 t/d左右;10月份在HSI大于0.8的中心渔场作业次数比例在43%以上,平均日产量在5.2 t/d以上。基于表温、盐度、海表面高度和叶绿素a的HSI模型能较好预测印度洋鸢乌贼中心渔场,且AM模型优于GM模型。 相似文献
9.
根据2007~2009年7~9月渔汛期间我国鲐鱼灯光围网在东海的生产数据,利用海表温、叶绿素浓度、悬浮物浓度和透明度等遥感水质数据,分别将作业网次比例和单网次产量(CPUE)作为适应性指数,利用算术平均数(AM)和几何平均数(GM)分别建立基于海表温、叶绿素浓度、悬浮物浓度和透明度的综合栖息地指数模型。结果表明,AM栖息地指数模型和GM栖息地指数模型拟合效果较好(P<0.01),在HSI大于0.5的海域,2007~2009年7~9月平均作业网次比例在65%以上,各月平均CPUE均高于19.82 t/net。研究认为,AM模型稍优于GM模型。利用2010年7~9月生产数据及遥感水质数据对AM模型进行验证,分析认为,87%以上的作业网次和产量分布在HSI高于0.5的海域,CPUE为14~17 t/net,且较稳定,波动较小。研究认为,基于遥感水质数据的AM栖息地指数模型能较好地预测东海鲐鱼渔场。 相似文献
10.
利用实验生态学的方法研究不同温度(15、20、25、30和35℃)、盐度(0、5、10、15和20)、pH(5、6、7、8和9)和体质量(1.93±0.08、3.43±0.12、7.95±0.34、11.74±0.41和15.84±0.61 g)对尼罗罗非鱼幼鱼窒息点的影响,并建立温度、盐度、pH、体质量与罗非鱼窒息点间的回归方程。结果表明:温度t、盐度S、pH和体质量m对尼罗罗非鱼幼鱼窒息点有显著影响(P<0.05)。当温度、盐度、pH和体质量分别为25.28℃、3.6、8.06、6.3 g时,窒息点(DAP)最低,回归方程为DAP=0.000 9 t 2-0.045 5 t+0.726 6(R2=0.952 1),DAP=-0.000 1 S 3+0.004 2 S 2-0.023 9 S+0.111 9(R2=0.922 8),DAP=0.009 3 pH2-0.149 9 pH+0.7174(R2=0.976 8);DAP=-0.000 3 m3+0.011 1 m2-0.104 3 m+0.362 8(R2=0.948 4)。在溶氧不足情况下,温度25.28℃、盐度3.6、pH 8.06的环境条件有助于提高幼鱼耐低氧能力。 相似文献
11.
Comparing fat content with physiological status can throw light on the reproduction and feeding behavior of the fish. The biological data of 586 bigeye tuna were collected from the longline fishery in the waters of Western Central Indian Ocean from November, 2012 to March, 2013. The spatial or temporal distribution of the fat content, and the relationships of fat content with gender, round weight, gonadal maturity and fork length were analyzed. A generalized additive model (GAM) was used to analyze the relationships between fat content and fork length (FL), gonadosomatic index (GSI), condition factor (K), and somatic index (SI). Results showed that: 1) the fat content of bigeye tuna was in the range of 3.1%–27.1% with the average 12.8%; 2) there were no significant geographical differences of average fat content (P > 0.05) among 1° squares in general; 3) there were no significant differences (P > 0.05) of the fat content for different genders, months, or gonad maturity stages; 4) there was an extremely significant correlation (P = 0.000) between fat content and FL and GSI. There was no significant correlation (P = 0.051) between fat content and K. There was a significant correlation (P = 0.003) between fat content and SI. The results of this study suggest that the fat content of the matured fish was relatively stable. The survey area was in a spawning region, and the survey period was the spawning season for bigeye tuna. 相似文献
12.
南太平洋长鳍金枪鱼渔场预报模型研究 总被引：4，自引：0，他引：4
长鳍金枪鱼资源是南太平洋金枪鱼渔业的重要目标种类,也是我国金枪鱼延绳钓的主要捕捞对象之一。根据2008-2009年我国海洋渔业公司在南太平洋海域的生产数据,结合表层、105 m和205 m水层温度,以及海面高度、叶绿素a浓度等海洋环境数据,运用一元非线性回归方法,按季度建立基于各环境因子的长鳍金枪鱼栖息地适应性指数,采用算术平均法获得基于多环境因子的栖息地指数综合模型,并用于中心渔场的预报。通过与实际作业渔场的比较与验证,结果表明:模型预报准确性达到70%以上,具较高渔情预报准确度。 相似文献
13.
In the Indian Ocean, bigeye tuna supports one of the most important fisheries in the world. This fishery mainly consists of two components: longline and purse seine fisheries. Evidence of overfishing and stock depletion of bigeye tuna calls for an evaluation of alternative management strategies. Using an age-structured operating model, parameterized with the results derived in a recent stock assessment, we evaluated the effectiveness of applying constant fishing mortality (CF) and quasi-constant fishing mortality (QCF) strategies to reduce fishing effort of purse seining with fish aggregating devices (FADs) at different rates. Three different levels of productivity accounted for the uncertainty in our understanding of stock productivity. The study shows that the results of CF and QCF are similar. Average SSB and catch during simulation years would be higher if fishing mortality of FAD-associated purse seining was reduced rapidly. The banning or rapid reduction of purse seining with FAD resulted in a mean catch, and catch in the last simulation year, higher than that of the base case in which no change was made to the purse seine fishery. This could be caused by growth overfishing by purse seine fisheries with FADs according to the per-recruit analysis. These differences would be more obvious when stock productivity was low. Transferring efforts of FAD-associated purse seining to longline fisheries is also not feasible. Our study suggests that changes are necessary to improve the performance of the current management strategy. 相似文献
14.
The eastern fall cohort of the neon flying squid, Ommastrephes bartramii, has been commercially exploited by the Chinese squid jigging fleet in the central North Pacific Ocean since the late 1990s. To understand and identify their optimal habitat, we have developed a habitat suitability index (HSI) model using two potential important environmental variables - sea surface temperature (SST) and sea surface height anomaly (SSHA) - and fishery data from the main fishing ground (165°-180°E) during June and July of 1999-2003. A geometric mean model (GMM), minimum model (MM) and arithmetic weighted model (AWM) with different weights were compared and the best HSI model was selected using Akaike’s information criterion (AIC). The performance of the developed HSI model was evaluated using fishery data for 2004. This study suggests that the highest catch per unit effort (CPUE) and fishing effort are closely related to SST and SSHA. The best SST- and SSHA-based suitability index (SI) regression models were SISST-based = 0.7SIeffort-SST + 0.3 SICPUE-SST, and SISSHA-based = 0.5SIeffort-SSHA + 0.5SICPUE-SSHA, respectively, showing that fishing effort is more important than CPUE in the estimation of SI. The best HSI model was the AWM, defined as HSI=0.3SISST-based+ 0.7SISSHA-based, indicating that SSHA is more important than SST in estimating the HSI of squid. In 2004, monthly HSI values greater than 0.6 coincided with the distribution of productive fishing ground and high CPUE in June and July, suggesting that the models perform well. The proposed model provides an important tool in our efforts to develop forecasting capacity of squid spatial dynamics. 相似文献
15.
2004年北太平洋柔鱼钓产量分析及作业渔场与表温的关系 总被引：1，自引：0，他引：1
根据2004年5~11月我国鱿钓船在北太平洋生产数据,结合表温资料,按经纬度1°×1°的格式,利用Marineexplorer 4.0软件作图进行柔鱼钓产量及渔场与表温的关系分析。结果表明,5~7月在160°E以东海域作业,产量较低;8~10月在150°~160°E海域作业,为生产作业的产量高峰期,占总产量的62.5%;11月在150°E以西海域作业,产量也较低。在150°E以西海域CPUE最高,150°~160°E中部海域次之,160°E以东海域最低。作业渔场的适宜表温呈现出季节性变化。各月适宜表温分别为:5月12~14℃;6月15~16℃;7月14~16℃;8月18~19℃;9月16~17℃;10月15~16℃;11月12~13℃。 相似文献
16.
Trophic ecology of sharks in the mid-east Pacific ocean inferred from stable isotopes 总被引：1，自引：0，他引：1
As apex predators, sharks are of ecological and conservation importance in marine ecosystems. In this study, trophic positions of sharks were estimated using stable isotope ratios of carbon and nitrogen for five representative species caught by the Chinese longline fleet in the mid-east Pacific, i.e., the blue shark(Prionace glauca), the bigeye thresher shark(Alopias superciliosus), the silky shark(Carcharhinus falciformis), the scalloped hammerhead(Sphyrna lewini), and the oceanic whitetip shark(Carcharhinus longimanus). Of these species, oceanic whitetip shark has the lowest trophic level and mean δ15N value(3.9 and 14.93‰± 0.84‰), whereas bigeye thresher shark has the highest level/values(4.5 and 17.02‰± 1.21‰, respectively). The bigeye thresher shark has significantly higher δ15N value than other shark species, indicating its higher trophic position. The blue shark and oceanic whitetip shark has significantly higher δ13C values than bigeye thresher shark, silky shark and scalloped hammerhead, possibly due to different diets and/or living habitats. The stable isotope data and stomach content data are highly consistent, suggesting that stable isotope analysis supplements traditional feeding ecology study of sharks, and thus contributes to understanding their trophic linkage. 相似文献
17.
Simulation of double cold cores of the 35°N section in the Yellow Sea with a wave-tide-circulation coupled model 总被引：1，自引：0，他引：1
Based on the MASNUM wave-tide-circulation coupled numerical model, the temperature structure along 35°N in the Yellow Sea
was simulated and compared with the observations. One of the notable features of the temperature structure along 35°N section
is the double cold cores phenomena during spring and summer. The double cold cores refer to the two cold water centers located
near 122°E and 125°E from the depth of 30m to bottom. The formation, maintenance and disappearance of the double cold cores
are discussed. At least two reasons make the temperature in the center (near 123°E) of the section higher than that near the
west and east shores in winter. One reason is that the water there is deeper than the west and east sides so its heat content
is higher. The other is invasion of the warm water brought by the Yellow Sea Warm Current (YSWC) during winter. This temperature
pattern of the lower layer (from 30m to bottom) is maintained through spring and summer when the upper layer (0 to 30m) is
heated and strong thermocline is formed. Large zonal span of the 35°N section (about 600 km) makes the cold cores have more
opportunity to survive. The double cold cores phenomena disappears in early autumn when the west cold core vanishes first
with the dropping of the thermocline position.
Supported by the National Basic Research Program of China (No. G1999043809) and the National Science Foundation of China (No.
49736190). 相似文献
18.
Application of nonlinear multi-channel algorithms for estimating sea surface temperature with NOAA-14 AVHRR data 总被引：1，自引：0，他引：1
李晓峰 《中国海洋湖沼学报》2000,18(3):199-207
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19.
CHEN Meixiang) ZUO Juncheng) LI Peiliang) DU Ling) and LI Lei)) Oceanography Department Ocean University of China Qingdao P. R. China ) Key Laboratory of Coastal Disaster Defence Ministry of Education Hohai University Nanjing P. R. China 《中国海洋大学学报(英文版)》2007,6(2):117-124
Based on a ship survey during January 1998, the characteristics of the flow, the thermohaline properties and the volume transport of the Arabian Sea are discussed. A strong westward flow exists between 10.5?N and 11?N, part of which turns to the south as the Somali current near the coast at about 10?N and the rest turns north. At the passage between the African continent and the So- cotra Island, the northern branch separates into two flows: the left one enters the passage and the right one flows eastward along the southern slope of the island. Off the island the flow separates once more, most of it meandering northeast and a small fraction flow- ing southeast. Volume transport calculation suggests that the tidal transport is one or two orders of magnitude smaller than the total transport in this region and it becomes more important near the coast. The average velocity of the flow in the upper layer (0-150 m) is about 20 cm s-1, with a maximum of 53 cm s-1 appearing east of the Socotra Island, and the subsurface layer (200-800 m) has an aver- age velocity of 8.6 cm s-1; the velocity becomes smaller at greater depths. The depth of the seasonal thermocline is about 100 m, above which there is a layer with well mixed temperature and dissolved oxygen. High-salinity and oxygen-rich water appears near the surface of the northern Arabian Sea; a salinity maximum and oxygen minimum at 100 m depth along 8?N testifies the subduction of surface water from the northern Arabian Sea. Waters from the Red Sea and the Persian Gulf also influence the salinity of the area. 相似文献