中国海洋经济前景预测   总被引：1，自引：0，他引：1  

罗鹏  白福臣  张莉 《渔业经济研究》2009,(2):10-13

中国海洋经济正处于快速发展阶段,加强海洋经济的预测研究将有利于认识海洋经济发展规律、确定全国海洋经济发展目标和实现海洋开发战略目标。文章主要运用趋势外推法和灰色系统理论构建海洋经济预测模型,利用历史统计数据,预测中国海洋经济的发展趋势。  相似文献   

Swimming speeds and orientation of wild Atlantic salmon post-smolts during the first stage of the marine migration     

F. ØKLAND  E. B. THORSTAD  B. FINSTAD  R. SIVERTSGÅRD  & N. PLANTALECH  N. JEPSEN  & R. S. MCKINLEY 《Fisheries Management and Ecology》2006,13(4):271-274

  相似文献   

我国海洋牧场建设回顾与展望   总被引：7，自引：12，他引：7  

杨红生 《水产学报》2016,40(7):1133-1140

海洋牧场是基于海洋生态学原理和现代海洋工程技术,充分利用自然生产力,在特定海域科学培育和管理渔业资源而形成的人工渔场。海洋牧场的特点包括以增加渔业资源量为目的、具有明确的边界和权属、苗种主要来源于人工育苗或驯化、通过放流或移植进入自然海域、主要以天然饵料为食和对资源实施科学管理等。早在1965年,我国学者曾呈奎先生就原创性地提出在海洋中通过人工控制种植或养殖海洋生物,建设"牧场"的理念。上世纪八十年代以来,我国海洋牧场经历了从增殖放流、人工鱼礁建设到系统化的海洋牧场发展过程,在取得巨大成就的同时,也面临着海洋牧场的涵义应用过于宽泛、缺乏统筹规划和科学论证、忽视海洋牧场生态作用以及忽视项目评估和系统管理等问题。展望未来,我国的海洋牧场建设应在"生态优先、陆海统筹、三产贯通、四化同步、创新跨越"的发展理念指导下,加强海洋牧场建设的宏观引导、推动海洋牧场体系化建设、实施海洋牧场企业化运营,在获得经济效益的同时,实现产业繁荣和保持健康生态系统的和谐统一。  相似文献   

Phenotypic differences may limit the potential for habitat restoration involving species translocation: a case study of shape ecophenotypes in different populations of Modiolus modiolus (Mollusca: Bivalvia)          下载免费PDF全文

Jose M. Fariñas‐Franco  William G. Sanderson  Dai Roberts 《水产资源保护:海洋与淡水生态系统》2016,26(1):76-94

匍枝马尾藻人工栽培初步研究     

邹潇潇  林勇  朱军  黄惠琴  鲍时翔 《渔业现代化》2016,(3):29-33

为探索匍枝马尾藻(Sargassum polycystum)的人工栽培技术,采用浮筏式栽培方式于2015年3—6月在海南省儋州市海头镇进行了匍枝马尾藻的人工栽培试验,记录了该藻的生长规律,并通过栽培水深和夹苗密度试验,比较了不同栽培条件对其生长的影响。结果显示,3月下旬至5月下旬为匍枝马尾藻生长最旺盛的季节,其中藻体长度的快速增长主要集中在4月中旬以前,而藻体重量以相对稳定的速率持续增长至5月下旬。栽培水深和夹苗密度分别对匍枝马尾藻的藻体长度和分枝数有显著影响,而藻体鲜重则同时受到这两个因素的影响(P0.05)。研究表明,适量增加匍枝马尾藻的栽培水深和控制夹苗密度有利于促进其生长;为有效提高匍枝马尾藻的产量,栽培水深应设计为80 cm左右,夹苗密度控制在10 cm左右。  相似文献   

Long-term effect of photoperiod manipulation on growth, maturation and flesh quality in Atlantic halibut     

Albert K Imsland  Bjørn Roth  Atle Foss  Erik Vikingstad  Sigurd O Stefansson  Skjalg Pedersen  Trond Sandvik  & Birgitta Norberg 《Aquaculture Research》2009,40(11):1260-1269

The aim of this study was to investigate the effect of continuous light at different stages during the production cycle of Atlantic halibut Hippoglossus hippoglossus L. on growth, age at first maturity, endocrine parameters and flesh quality. A group of juvenile halibut [mean (SD), initial weight 191.3 g (44.7)] was reared in indoor tanks under ambient temperature conditions for 38 months until harvesting (mean final weight, 4.6 kg). The entire photoperiod experiment was divided into four phases, where the fish in each phase were exposed to either natural photoperiod (62°33'N) or continuous light (L). Thus, the following five photoperiod combinations were tested: (a) Control group (NNNN), (b) Group 2A (NLNN), (c) Group 2B (NNLN), (d) Group 2C (NNNL) and (e) Production group (LNNN). Exposure to continuous light stimulated growth, and the final mean weights of Groups 2A and 2B were 23% and 11% higher than those of the Control group (NNNN). The final plasma 11-ketotestosteron levels were lower in Groups 2A (2.94 ng mL⁻¹) and 2B (2.46 ng mL⁻¹) compared with the Control (5.29 ng mL⁻¹), Group 2C (5.09 ng mL⁻¹) and the Production group (4.78 ng mL⁻¹) during spring 2007 (age 4 years), indicating higher age at first maturity in Groups 2A and 2B. Photoperiod regime had only a minor, and transient, effect on flesh-quality traits of the fish, whereas a significant seasonal effect was seen with a tendency towards increased gaping, lower pH, lower hardness and lower shear force in July compared with December and March.  相似文献   

人工诱导海水鱼类雌核发育的研究进展     

胡则辉  徐君卓 《海洋渔业》2007,29(1):78-83

近三十年来,国内外海水鱼类的增养殖业发展迅速,尤其以提高增养殖鱼类产量和质量为主要目的的染色体组工程已成为海水鱼类育种的热点.作为一种实用的染色体组操作技术,雌核发育是在雌核控制下的发育,精子只作为"激活源",入卵后不形成雄核,所以后代的遗传特质仅仅来源于母性亲本.  相似文献   

A dynamic mass-balance model for marine protected areas   总被引：2，自引：0，他引：2  

Watson  Alder  & Walters 《Fish and Fisheries》2000,1(1):94-98

A modified Ecosim model was used to investigate the impact of establishing marine protected areas (MPAs) in ecosystems defined by existing Ecopath models. The impact of MPAs of various sizes was simulated, and changes in biomass and catch over a range of years observed. The response of biomass and catch to MPA size depended on the time period examined. For some ecosystem groups, the initial response was negative, but for all groups there were increases after 10 years. The greater the biomass exchange rate across the MPA boundary, the larger the MPA required to increase biomass levels. Within the range of exchange rates simulated, the maximum increases in catch and overall biomass levels were reached when 20% of the system was protected.  相似文献   

海洋微生物酶的研究概况   总被引：2，自引：0，他引：2  

郭琪  王静雪 《水产科学》2005,24(12):41-44

海洋中蕴藏着丰富的微生物资源,海洋微生物对于维持海洋生态平衡发挥着重要作用。尽管海洋中的许多微生物推测是由陆地环境经河水、污水、雨水或尘埃等途径而来的,但特殊的海洋环境赋予海洋微生物以特殊的遗传结构和生活习性。海洋生态环境复杂,高盐度、高压力、低温及特殊的光  相似文献   

Cell wall disruption: An effective strategy to improve the nutritive quality of microalgae in African catfish (Clarias gariepinus)     

Jeleel O. Agboola  Emma Teuling  Peter A. Wierenga  Harry Gruppen  Johan W. Schrama 《Aquaculture Nutrition》2019,25(4):783-797

The rigid cell walls of microalgae may hinder their utilization in fish feeds. The current experiment assessed the correlation between the accessibility of microalgae nutrients and their in vivo digestibility in African catfish. Nannochloropsis gaditana biomass was subjected to physical or mechanical treatments to weaken its cell wall; untreated—no disruption treatment (UNT), pasteurization (PAS), freezing (FRO), freeze‐drying (FRD), cold pasteurization (L40) and bead milling (BEM). Six experimental diets formulated from differently treated and untreated microalgae (at 30% diet inclusion level) were tested on growth performance and apparent nutrient digestibility (ADCs) in juvenile African catfish. A basal diet (REF) containing no microalgae was used as reference diet. Results showed that biomass gain and feed conversion ratio of fish fed L40 and BEM diets increased by 13% and 11%, respectively, relative to the UNT diet. Additionally, FRD, FRO, L40 and BEM cell wall disruption treatments improved protein digestibility by 0.5%, 5.9%, 8.4% and 16.3%, respectively, compared to the UNT treatment. There was a positive correlation between accessibility of microalgal nutrients and their digestibility in African catfish. Nutrient digestibility of microalgae was dependent on extent of cell disruption. Also, the impact of cell disruption on nutrient digestibility of microalgae differs between African catfish and Nile tilapia.  相似文献