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1.
泰国对虾生态养殖的发展现状 总被引：1，自引：0，他引：1
泰国地处热带地区,有着得天独厚的水产养殖自然条件.50%以上的泰国人口从事农业尤其是水产相关的产业.2007年对虾产量达47万t, 2008年1-11月对虾产量43万t.2004年前主要养殖斑节虾(P.monodon),2006年南美白对虾(P.vannamei)占到了90%.泰国政府提出了把泰国建成"世界菜篮子"的设想,制定了渔业发展规划,积极加大农业尤其是水产业的发展力度,促进了水产品的出口. 相似文献
2.
如表所示，2007年世界鲑鳟总产量突破300万t大关增至300．5万t（换算为原条鱼计的推算产量），其中天然捕捞产量为104．9万t（占35％）；养殖产量为195．7万t（占65％）。但2008年世界鲑鳟总产量减至291．3万t，比2007年的300．5万t减少3．1％， 相似文献
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东江水库碳汇渔业与生态保护的初步研究 总被引：1，自引：0，他引：1
2007年7月和10月对东江水库的水体初级生产力和水质进行了监测和评价,估算了天然渔业资源量及可移出碳量。研究表明,库区存在较丰富的外源性营养物质,主要来源于农业、生活废水及旅游业;10月水体水质优于7月,均属中营养水平;初级生产力平均为5.13g/(m2.d),与水体叶绿素、氨氮和总磷浓度呈较强的正相关;折算滤食性鱼产量为1541.9t/年,移出碳量为218.4t/年。2007-2010年进行鱼类增殖放流,获得天然滤食性渔获物最高达产量为900t/年,移出碳量127.5t/年。在制订东江水库渔业环境保护条例时,按初级生产力的大小,利用增殖放流等渔业去碳技术,适量投放滤食性鱼类,充分利用水体氮、磷,可实现东江水库碳汇渔业的可持续发展。 相似文献
5.
韩国在太平洋金枪鱼的产量90％以上捕自中西太平洋区域,在中西太平洋地区的产量保持在21．6-28．1万t之间,平均为25．1万t。过去5年里围网的产量在18.3万t至25.8万t之间波动,平均为21．9万t。鲣鱼和黄鳍金枪鱼的产量各占74．4％和19．2％。韩国延绳钓渔业主要捕捞大眼金枪鱼和黄鳍金枪鱼和少量长鳍金枪鱼,占总产量的86．3％。类金枪鱼和其它鱼类是延绳钓渔业的附加渔获物：过去5年中在中西太平洋的延绳钓渔业产量保持在2．3万t至3．9万t之间。2007年延绳钓渔船和围网渔船的数量各自为112艘和26～28艘,比前年减少10艘延绳钓渔船。 相似文献
6.
2007年世界的天然捕捞和养殖的鲑鳟鱼合计总产量为280．6万t（换算为原条鱼的产量）,比2006年的240．3万t增加17％,其中天然捕捞产量为97．3万t（占35％）,比2006年的74．7万t增加30％;养殖产量为183．6万t（占65％）,比2006年的165．6万t增加11％。表明世界的养殖鲑鳟鱼产量已占绝对的优势。 相似文献
7.
日本在西北太平洋捕捞的秋刀鱼是一条价廉物美的大众化鱼类。日本2007年的秋刀鱼产量已比2000年的21．1万t增至29．6万t。日本2007年秋刀鱼的TAC（总容许渔获量）为39．6万t,表明还有增产的潜力。 相似文献
8.
2007年7月和10月对东江水库的水体初级生产力和水质进行了监测和评价,估算了天然渔业资源量及可移出碳量。研究表明,库区存在较丰富的外源性营养物质,主要来源于农业、生活废水及旅游业;10月水体水质优于7月,均属中营养水平;初级生产力平均为5.13g/（m2.d）,与水体叶绿素、氨氮和总磷浓度呈较强的正相关;折算滤食性鱼产量为1541.9t/年,移出碳量为218.4t/年。2007-2010年进行鱼类增殖放流,获得天然滤食性渔获物最高达产量为900t/年,移出碳量127.5t/年。在制订东江水库渔业环境保护条例时,按初级生产力的大小,利用增殖放流等渔业去碳技术,适量投放滤食性鱼类,充分利用水体氮、磷,可实现东江水库碳汇渔业的可持续发展。 相似文献
9.
据日本财务省的报关统计显示,2008年日本的水产品出口量为51．9万t,比2007年的61．2万t减少了15．2％,水产品的出口金额为2083．4亿日元,比2007年的2381．1亿日元减少了12．5％。回顾日本的水产品出口,1999年时水产品的出口量约为20万t, 相似文献
10.
1 我国珍珠养殖扩张情况 养蚌育珠是水产业中低投入高产出的项目,前几年珍珠养殖利润高达300%,吸引了许多农民转产做养殖.看到珍珠的利润,许多水产养殖户转行.中国2007年的珍珠产量达1 600 t,占全世界产量的95%以上. 相似文献
11.
Abstract The artisanal, stake net fishery for shrimp in the Negombo lagoon, Sri Lanka, was studied over 2 years. There are around 22 sites, at which 57–63 stake nets can be fixed, at sites close to the sea mouth of the Negombo lagoon. The estimated mean catch rates of the fishery were 23.21 and 26.19 kg per operation in 1998 and 1999, respectively. The estimated annual fish productivity from the fishery reduced from 240 t in 1998 to 215 t in 1999. Subadults of penaeid shrimps formed 82% of the stake net catch. The net monthly income per fishermen varied from Rs. 5000 to 33 200 (mean = 13 667). In the Negombo lagoon stake net fishery, a mechanism for equity sharing was formulated by the fishing community. 相似文献
12.
S-Y Shiau 《Aquaculture Research》2001,32(8):639-643
Fish is an important dietary animal protein in Taiwan. Fish production has increased from 20 000 tonnes (t) in 1938 to over 300 000 t today. The change in feed inputs from trash fish to formulated feeds enabled industrial production of fish food. Nutrition studies for shrimp began in the 1970s and continue today. Stable ascorbic acid derivatives have allowed industrial production of shrimp feeds and the development of the extensive production systems in Taiwan and elsewhere in Asia. 相似文献
13.
ABSTRACT: We carried out mail and access point surveys to estimate the catch numbers, angling effort of recreational angling and the population of sockeye salmon Oncorhynchus nerka in Lake Toya in 1998 and 1999. The mail survey questions in questionnaires distributed to anglers with a recreational angling license included date of angling, caught fish species and size, and catch number. In the access point survey we also asked anglers if they had a license. We measured the fork length and weight of caught fish. The catch rate (catch number in a day by each angler) from both surveys showed no significant difference, suggesting no bias for the catch rate between surveys. The estimated total angling effort was 1760 people (1998), and 1516 people (1999). The estimated recreational catch was 28 889 (1998) and 5455 (1999), that is, two or three times larger than the commercial catch. The fish population was estimated by using the DeLury method as 60 262 (1998) and 10 806 (1999). The total exploitation rate was 62% (1998) and 78% (1999). The size of caught fish was much larger in 1999 than 1998 because of the difference in age composition. 相似文献
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P. A. A. T. Jayawardane D. S. Mclusky P. Tytler 《Fisheries Management and Ecology》2003,10(3):179-189
The population dynamics of Metapenaeus dobsoni (Miers) from the west coast of Sri Lanka was investigated based on catch/effort and length frequency data, using FiSAT software. Annual yield of M. dobsoni was estimated at 296 t in 1998 and 362 t in 1999. This species formed 54% of the total shrimp catch from the system. The asymptotic length (L) and the growth rate constant (K) were estimated to be 11.49 cm and 1.02 yr?1 for males and 12.8 cm and 1.73 yr?1 for females. The fishing mortality coefficients were 2.42 and 1.85 yr?1 for males and females, respectively. The natural mortality was estimated at 1.72 yr?1 for males and 2.51 yr?1 for females. The recruitment for the estuarine environment and the offshore areas was continuous but peaked twice per year. The maximum sustainable yield (MSY) was estimated at 294.65 t, around the current catch estimates. To obtain maximum sustainable economic yield (MSE = 293.56 t) the present effort should be reduced by 10%. 相似文献
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本研究基于 2014 年江苏沿海定置张网渔船的大样本随机抽样调查数据, 对渔船捕捞产量及渔获物结构的时空分布特征进行了初步分析。研究结果显示: 江苏沿海渔船捕捞具有显著的空间特征, 多数在近海生产、少有渔船远赴外海生产, 除个别月份, 少有渔船在长江口航道中生产, 长江口近岸北侧常年有该类渔船生产, 在江苏近岸 20 m 等深线附近水域形成了一条连贯、且相对高产的水道走廊。渔船生产具有季节性, 在水温偏低的冬季, 渔船趋于向外、向南扩展生产, 而在水温偏高的夏季则趋于向北扩展生产。渔获物结构比较分析发现, 主捕对象存在季节变化, 分别出现虾类(1—4 月和 10—11 月)、毛虾(2—3 月、5 月和 11—12 月)、梭子蟹(9—11 月)等渔获比例相对较高的情况, 而杂鱼杂虾除 1—4 月和 11 月比例相对偏小外, 其余月份比例均较高, 虾类资源与其他杂鱼杂虾资源之间呈现显著负向关系。文献比较分析发现, 渔获物中的杂鱼杂虾与经济鱼类幼鱼之间有对应关系。基于研究结果, 建议定置张网伏休时间提前一个月、并加强伏休后渔船捕捞网目尺寸的管理, 以确保足量补充群体维持渔业资源的可持续利用。 相似文献
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Cosmas Munga Stephen Ndegwa Bernerd Fulanda Julius Manyala Edward Kimani Jun Ohtomi Ann Vanreusel 《Fisheries Science》2012,78(2):209-219
The Malindi–Ungwana Bay fishery Kenya is one of the most important marine fisheries of the Western Indian Ocean. There are
two fishing grounds: Formosa and Malindi, with a designated 5-nM no-trawl zone offshore. However, the fishery was faced with
numerous resource use conflicts and a decline in catches, culminating in a trawl ban in 2006. This study analyses catches
and fishery dynamics before and after the 2006 trawl ban. Results show that artisanal landings declined before the ban, but
rapidly recovered within 2 years after the ban was imposed. However, shrimp landings in the artisanal fishery remain low.
Commercial shrimp landings gradually declined before the ban: ~550 t in 2001 to 250 t in 2006, and the shrimp: fish bycatch
ratio was 1:1.5 compared to early reports of 1:7 in 1999. SIMPER analyses shows that 6 and 16 families (groups) accounted
for 91.0 and 90.2% of the similarity in catch within the Formosa and Malindi fishing grounds, respectively. Formosa was important
for Claridae, Cichlidae and Protopteridae, while Malindi recorded Carangidae, Siganidae, Carcharhinidae and Lethrinidae as
the main families. Future studies should therefore embark on analyses of the factors driving the spatio-temporal distributions
of the species and assess the impacts of bottom trawling on fishery dynamics before the trawl ban can be lifted. 相似文献
18.
After 42 days feeding on either a Huayi formulated diet (HY) or trash fish (TF), the meat quality of Chinese mitten crab, Eriocheir sinensis, was compared. The meat yield of males (25 vs. 22%) was higher, but the total edible yield was lower than that of the females (p < 0.05). The proximate composition of both genders fed two diets was similar (p > 0.05), and there was no significant difference in the total collagen content of the meat (0.2–0.30%) between both dietary treatments and genders (p > 0.05). The diets had no significant effects on free amino acid content of the meat, while gender significantly affected the contents of some amino acids, such as taurine and glycine. Crabs fed TF had significantly lower contents of 20:5n-3 as well as higher arachidonic acid (ARA)/eicosapentaenoic acid (EPA) value compared with those of same sex crabs fed HY (p < 0.05). There were no significant dietary effects on a range of sensory traits evaluated by panelists, neither in female nor in male crabs. These results suggested no negative effects of formulated diet HY on the meat quality compared to trash fish. Therefore, diet HY could be used to replace the trash fish for fattening mitten crabs. 相似文献
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《水生生物资源》1998,11(1):1-11
A longline ‘metier’ using small hooks for ‘red’ sea breams (Pagellus acarne and Pagellus erythrinus) in the Algarve (south of Portugal) was studied. Experimental longlining was carried out with three sizes of “Mustad” round bend, flatted, spade end Quality 2316 DT hooks (numbers 11, 13 and 15) and two types of bait: razor shell (Ensis siliqua) and mud shrimp (Upogebia pusilla). A total of 3 328 fish and at least 36 species were caught with 33 600 hooks fished in 28 longline sets. Five species of sea breams (Sparidae) accounted for 79% of the catch: Pagellus acarne, Pagellus erythrinus, Diplodus vulgaris, Spondyliosoma cantharus, and Boops boops. High catch rates of 20–30 fish per 100 hooks were made in a number of 1 200 hook longline sets, with total catch weights of 40 to more than 60 kg per set. In general, the smallest hook (number 15) had the highest catch rate. Bait type did not significantly affect the catch size distributions. Although more fish were caught with the razor shell bait, higher catch rates of ‘red’ sea breams were obtained with mud shrimp. Catch rates were also affected by the location of the fishing grounds and the time of the set, with the highest catch rates obtained when the longline was set within two hours before sunrise. A wide size range was caught for each species, with highly overlapped catch size frequency distributions for the three hook sizes used. Except for Spondyliosoma cantharus, few illegal-sized fish were caught, even with the smallest hook. The logistic model fitted by maximum likelihood was used to describe hook selectivity for Diplodus vulgaris, Pagellus acarne, Pagellus erythrinus, and Spondyliosoma cantharus. 相似文献