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fish school
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  鱼群
     Parameter Tuning Method of Robust PID Controller Based on Artificial Fish School Algorithm
     基于人工鱼群算法的鲁棒PID控制器参数整定方法研究
短句来源
     Applications of artificial fish school algorithm in combinatorial optimization problems
     组合优化问题的人工鱼群算法应用
短句来源
     Parameter estimation method based-on artificial fish school algorithm
     基于人工鱼群算法的参数估计方法
短句来源
     STUDY ON THE FEASIBILITY OF MEASURING SHADOW EFFECT ENCOUNTERED IN DENSE FISH SCHOOL BY SIMRAD EK400—QD SYSTEM
     SIMRAD EK400—QD测定密集鱼群荫蔽效应可行性的研究
短句来源
     Study on Advanced Aggregate Production Planning Optimization Using Artificial Fish School Algorithm
     基于人工鱼群算法的高级综合生产计划优化研究
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  “fish school”译为未确定词的双语例句
     RELATION BETWEEN THE VARIATION OF FISH SCHOOL AND AMMONIA CONTENT IN WATER
     海中鱼类集群地点与海水中氨量分布的关系
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     It shows that artificial fish school algorithm has rapid convergence ability.
     结果表明它具有快速收敛的能力 .
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  fish school
All crustacean taxa were rare in the epilimnion at night when sonar recorded a dense fish school.
      
The model examples are simulation of a fish school in a changing environment; simulation of a robin population in a beech forest; simulation of plant development.
      
Applying the economic theory of clubs to the biological literature on schooling fish, this paper develops a 'selfish fish' club-theoretic paradigm of why fish join a fish school, and arrive at the following conclusions.
      
Quantification of fish school structure is difficult because of: (1) the large amount of positional data that must be recorded, (2) the fact that schools are moving, and (3) the fact that schools are threedimensional.
      
These fractal analyses show that we need two different fractal dimensions (D1,D2) to understand the features of fish school movements:D1 corresponds to thesmaller coarsening levels, andD2 corresponds to thelarge coarsening levels.
      
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The hairtails centtal fishing ground of Shengshan is situated at Lat. 30°00′-31°10′N, and Long. 122°30--123°40′E, under the proper water temprature of 17-22℃ in winter. The shift of the fishing ground seems to be closely related with the changeof the nearby front of a high salt water tongue. The hairtails central fishing ground islocated on the north side of the front. In ordinary years, the front of the tongue changesvery little at the beginning and at the middle of the fishing season, but it moves south-ward...

The hairtails centtal fishing ground of Shengshan is situated at Lat. 30°00′-31°10′N, and Long. 122°30--123°40′E, under the proper water temprature of 17-22℃ in winter. The shift of the fishing ground seems to be closely related with the changeof the nearby front of a high salt water tongue. The hairtails central fishing ground islocated on the north side of the front. In ordinary years, the front of the tongue changesvery little at the beginning and at the middle of the fishing season, but it moves south-ward at the end of the season. The changes usually appear in three types. 1. During the fishing season, While the actions of the wind and the sea current arerelative balanced, the front of the tongue is stable, but it gradually retreats southward atthe end of the season. 2. During the fishing season, the turbulence of the gale disturbs the balance, itmakes the front to retrcat southward earlier than ordinary. 3. During the fishing season, the wind force is weak, and the sea current for thefishing-ground is obvious, so that the front retreats at first and advances then. The central fishing ground shifts coincident with the change of the above types andthe fish schools correspondingly appear stable, and moving near south or north. After all, the movement of the front of the tongue is regarded as the index ofhairtails contral fishing--ground shifting and the marine enviroments changes. Practicallysometimes the index appears in effectual, in caso of: (A) When the front is in thesouth of Lat. 30°N; (B) When the axis of the front is in the east of Long. 123°30′E. In such abnormal cases, other factors should be considered.

嵊山带鱼渔场位于东经122°30′—123°40′,北纬30°00′-31°10′。在冬季水温适宜的前提下(温度界限22~17℃),高盐水舌锋位置的变化,对中心渔场的转移有一定的制约作用。在一般年景,汛初至汛中高盐水舌锋位置变化不大。渔汛后期,高盐水舌锋位置南移。从它的概位与中心渔场相比看出:带鱼中心渔场均位于高盐水舌锋北侧,并有随着高盐水舌锋变化而转移的迹象。年际间,它的变化有如下三种类型: (1)第一种类型:渔汛期间,由于风、流作用相对平衡,高盐水舌锋分布稳定,汛末时逐渐偏南退缩。 (2)第二种类型:渔汛期间,由于大风形成的涡动作用大于其他因素,高盐水舌锋偏南提前退缩。 (3)第二种类型:渔汛期间,由于大风偏弱,海流对渔场的作用相对明显,使高盐锋区退而复进。 鉴于上述,带鱼中心渔场在转移时,鱼群也相应出现稳定、偏南、偏北等结果。由此可见,高盐水舌锋的变化,无疑地可作为带鱼中心渔场因海洋环境变化而转移的一项指标。 但是,从生产实践中又看到,当高盐水舌锋具有下列情况时,指标性变差: (1)当舌锋位于北纬30°30′以南海区时。 (2)当舌锋轴线位于东经123°30′以东海区时。

Tagging experiments on mackerel were carried out with five kinds of tags over the years from 1953 to 1976. Tagged fish totaled 24,641 of which 1,574 were recaptured. Recapture rate reached its peak in the year of tagging, and then declined year after year. The higher recapture rate of tagged mackerel was found on the Yantai-Weihai fishing grounds and the minimum one in the area of the central Yellow Sea. The recapture period of mackerel tagged before 1957 at the latest came to an end in the third year from the...

Tagging experiments on mackerel were carried out with five kinds of tags over the years from 1953 to 1976. Tagged fish totaled 24,641 of which 1,574 were recaptured. Recapture rate reached its peak in the year of tagging, and then declined year after year. The higher recapture rate of tagged mackerel was found on the Yantai-Weihai fishing grounds and the minimum one in the area of the central Yellow Sea. The recapture period of mackerel tagged before 1957 at the latest came to an end in the third year from the time when the fish were released, while that of the fish tagged in 1953 extended more than five years. And there were still mackerel to be recaptured five years later. The fact that after 1958 none of the recapture periods exceeded two years indicated an increase of fishing intensity during those periods. Based on the monthly shifts of the fishing grounds of purse seining and gill neting and on the results obtained from tagging experiments, it may be surmised that the mackerel migrated into the Yellow Sea had their origin mainly in two wintering grounds: off the northern Diaoyu Island (central part of the Southern East China Sea) and off the western Kyushu, Japan. The fish from the former wintering ground left there and made their initial migration northwards from late March to early April. Following the east longitude 123°30′and the 40-60 m isobathic line they moved into the Yellow Sea. From May to June they entered the areas off Qingdao-Shidao, Haiyang Island and Yantai-Weihai to spawn and at same time, a part of the fish school passed through the Bohai Strait and come into the Bohai Sea to spawn. The fish from the latter wintering ground moved along the north latitudes 32°30′-33°30′ into the Yellow Sea from late April to early May. They spawned mainly in the areas off Qingdao-Shidao from May to June and a part of migrants might arrive at the northern Yellow Sea, but generally they failed to enter the Bohai Sea. The mackerel which had come into the Yellow Sea spawned by the time of mid-July and dispersed about the southern Haiyang Island and south-eastern Shidao to search for food. They moved southwards along the deep waters at the east longitudes 124°00′-125°00′ after September. From September to November they retured to their wintering grounds. A part of young-of-the-year mackerel school failed to come back to their parents' wintering ground and remained in deep waters for wintering until the following spring. They then moved northwards.

1953—1976年本所先后用五种标志牌共标志放流鲐鱼24,641尾,重捕1,574尾。重捕率以当年最高,此后逐年下降。在烟威和海洋岛渔场标志放流鲐鱼的重捕率较高,在黄海中部标志放流鲐鱼的重捕率最低。1957年以前标志放流鲐鱼的最长重捕期为3年以上,1953年标志放流的鲐鱼经5年后(1958年)还有重捕,1958年以后标志放流鲐鱼的最长重捕期均在2年之内,似乎反映后期捕捞强度增长。根据1972、1974、1978、1979年围、流网渔况的逐月推移和标志放流重捕结果看出:洄游至黄海的鲐鱼,主要来自东海中南部钓鱼岛北部和日本九州西部外海两个越冬场。前者每年3月末至4月初游离越冬场北上,大致沿东经123°30′,40—60米等深线海区进入黄海,5—6月分别到达青岛—石岛外海、海洋岛外海、烟成外海产卵,部分鲐鱼群穿过渤海海峡进入渤海产卵。后者4月末至5月初沿北纬32°30′—33°30′海区晚于前述越冬群进入黄海。5—6月主要在青岛—石岛外海产卵,部分鱼群亦可到达黄海北部,但一般不进入渤海。进入黄海的鲐鱼至7月中旬产卵完毕,7—9月分散在海洋岛南部和石岛东南部索饵。9月以后鱼群陆续沿东经124°00′—125°00′...

1953—1976年本所先后用五种标志牌共标志放流鲐鱼24,641尾,重捕1,574尾。重捕率以当年最高,此后逐年下降。在烟威和海洋岛渔场标志放流鲐鱼的重捕率较高,在黄海中部标志放流鲐鱼的重捕率最低。1957年以前标志放流鲐鱼的最长重捕期为3年以上,1953年标志放流的鲐鱼经5年后(1958年)还有重捕,1958年以后标志放流鲐鱼的最长重捕期均在2年之内,似乎反映后期捕捞强度增长。根据1972、1974、1978、1979年围、流网渔况的逐月推移和标志放流重捕结果看出:洄游至黄海的鲐鱼,主要来自东海中南部钓鱼岛北部和日本九州西部外海两个越冬场。前者每年3月末至4月初游离越冬场北上,大致沿东经123°30′,40—60米等深线海区进入黄海,5—6月分别到达青岛—石岛外海、海洋岛外海、烟成外海产卵,部分鲐鱼群穿过渤海海峡进入渤海产卵。后者4月末至5月初沿北纬32°30′—33°30′海区晚于前述越冬群进入黄海。5—6月主要在青岛—石岛外海产卵,部分鱼群亦可到达黄海北部,但一般不进入渤海。进入黄海的鲐鱼至7月中旬产卵完毕,7—9月分散在海洋岛南部和石岛东南部索饵。9月以后鱼群陆续沿东经124°00′—125°00′深海区南下。9—11月经大、小黑山岛西部返回其越冬场。部分当年生幼鱼12月以后不返回其亲鱼越冬场,而停留在大、小黑山西部深海区越冬,俟翌年春回归北上。

Model 761 fishing sonar is mainly designed for purse seines and trawlers. It is a kind of multi-beam fishing sonar.It has 12 beama covering a 90°searching sector.It can provide an intuitive image like that of a radar and can determine the distance, movement direction of fish schools.When the purse seinc is cast, the distance between the net and school is clearly indicated. It is a good fishing instrument

761型渔用声纳主要用于围网渔船和拖网渔船。它是一种多波束声纳。该声纳有12个波束可搜索90度以内的扇面目标。它可象雷达一样直观描述观测目标。并可测出渔群的距离和渔群运动的方向。当撒出围网时,该声纳可清楚地示出网和渔群之间的距离。本仪器是一种性能良好的捕鱼工具。

 
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