The schnute model work well in full explored stocks such as scenario 1, 3, 4 and 5, especially in low biomass stocks such as scenario 3, but not suitable to the under explored stocks such as scenario 2. the w - h model generally performed well in all kind of scenarios especially in scenario 1, 4, and 5. in the swordfish, xiphias gladius, fishery, estimation of w - h model and d - fox model produced msy about 14000 ton, very near the result of prager in 1996
四種剩餘產量模型在充分
捕撈且管理良好的漁業1中評估效果較好而在
捕撈不足的漁業2中效果較差; schnute模型在充分
捕撈的漁業如漁業1 、 3 、 4 、 5 、尤其是在低生物量的漁業3中評估效果較好,但不適合評估未充分
捕撈的漁業,如漁業2 ; walters - hilborn模型( w - h模型)適用於各種漁業,尤其是漁業1 、 4 、 5 ;在過度
捕撈漁業中如漁業3 、 4 ,模型對參數q的估計較其它參數接近真值;在北大西洋箭魚( xiphiasgladius )漁業的評估中, w - h模型和d - fox模型對msy的估計約為14000噸,接近於prager ( 1996 )的結果。
The main varieties of sea fish landed are herring, cod, whiting, mackerel, plaice, ray, skate and haddock
愛爾蘭
捕撈的海魚品種主要是鯡魚、大西洋鱈、牙鱈、鮐魚、鰈魚、鷂魚、鰩魚和黑線鱈。
Major threats to hawksbill turtle are habitat destruction and alternation by coastal development, over - exploitation for meat, hides, eggs and shells, and incidental capture in fisheries
玳瑁面對的主要脅包括沿岸發展的改變或生境的破壞,人類對肉蛋和殼而遭過度的采
捕,以及遭漁民意外
捕撈。
The engines are mainly used in fishing and ship transport as well as land power generation and engineering machinery, etc
該機主要用於漁業
捕撈、船舶運輸等行業,另外可用於陸用發電及工程機械等領域。
Naturally rare, it is easy to overfish as their population could not recover in pace with the fishing
由於野生蘇眉非常稀有,種群修復步伐亦追不上
捕撈速度,因此極易受過度
捕魚影響。
Scientists predict that if people keep overfish ing, the next 50 years will see that kind of drop in most other kinds of fish as well
科學家預估如果人類繼續過度
捕撈魚類,未來五十年,其他魚類的數量大多亦將銳減九成。
They can ' t poach for herring form our waters
他們不可以在我國海域
捕撈鯡魚。
General provisions for programming mooring, sea trials and fishing of sea going fishing vessel
海洋漁船系泊航行及
捕撈試驗通則
About 4, 000 - 7, 000 years ago, there had already been the agriculture race who settled down in the region of shen pond, they were engaged in the original agriculture of the knife farm material for new fire and various management activities, such as catching, hunting, collecting, feed the livestock etc., and had already spin cotton, weaving
約四千至七千年前,滇池一帶已有了定居的農業民族,從事「刀耕火種」的原始農業和
捕撈狩獵採集飼養畜禽等多種經營活動,並已能紡紗織布。 2800年前,滇池周圍已進入了青銅器時代。
The harvest of wild species in the oceans and fresh waters of the earth appears to be approaching its maximum sustainable limit.
對地球上海洋和淡水中野生種的
捕撈看來已達到其可維持的極限。
To insure the sustainable development and harvest, we must control the fishing intensity at a certain level, and adopt logical strategy of fishing by doing this we can get the maximum sustaining yield, the marine fishery resources can not be utilized unduly and dry up
為了保證海洋漁業資源的可持續利用,必須把
捕撈強度控制在一定的水平上,採用合理的
捕撈策略,我們才可以得到持續的最大產量,才能避免海洋漁業資源的過度利用、枯竭。
They picked up critters from as deep as 6km, and they did so using both typical trawling nets and a special box that was designed to scoop up a slab of ocean floor along with a slice of undisturbed water from immediately above it
她們用傳統的拖網和一種經過特別設計的盒子在深度達6千米的區域
捕撈微生物,這個盒子可以鏟起海底泥土和吸入它正上部未被碰到過的海水。
Marine reserves are common in the tropics, butpolicymakers in temperate countries tend to focus on one species at atime to control numbers of that species caught
海洋資源在熱帶地區是共有的,但是溫帶地區國家的政策制定者們往往一次只重視對某一個物種的捕撈量進行控制。