Effects of temperature and dissolved oxygen content on oxygen consumption rate of Chinese prawn, giant tiger prawn and giant freshwater prawn     

戴习林  臧维玲  王为东  施永海  刘文翠  徐桂荣  李士华 《中国海洋湖沼学报》1999,17(2):119-124

INTRODUCnON-WatertemperatheanddissolvedoxygenareimportantenvironmentalfactorsinthegmwthanddevelOPmntofaqUaticorgAnsms.ThereareInanPublishedstUdiesontheox-.ygenconsUInPtionrate(OCR)oftheprawn')(WangJim,l986;WangDanghenetal-,199l;ZangWeilingetal-,l992,l993),buttheydidnotcontalndetailedinfonnaionabouttheeffectoftemPerabeontheOCR-ThePresentstudydetendnedtheOCRofju-venilesofChineseprawn,gianttiserprawnandgiantfreshwaterprawnthatwererearedatdifferenttemperatllresforaboutaweekattheCaoj…  相似文献   

Nursery use patterns of commercially important marine fish species in estuarine systems along the Portuguese coast     

R.P. Vasconcelos  P. Reis-Santos  A. Maia  V. Fonseca  S. França  N. Wouters  M.J. Costa  H.N. Cabral 《Estuarine, Coastal and Shelf Science》2010

Analysing the estuarine use patterns of juveniles of marine migrant fish species is vital for identifying important sites for juveniles as well as the basic environmental features that characterize these sites for different species. This is a key aspect towards understanding nursery function. Various estuarine systems along the Portuguese coast (Minho, Douro, Ria de Aveiro, Mondego, Tejo, Sado, Mira, Ria Formosa and Guadiana) were sampled during Spring and Summer 2005 and 2006. Juveniles of commercially important marine fish species Solea solea, Solea senegalensis, Platichthys flesus, Diplodus vulgaris and Dicentrarchus labrax, predominantly 0-group individuals, were amongst the most abundant species and had distinct patterns of estuarine use as well as conspicuous associations with several environmental features. Juvenile occurrence and density varied amongst estuaries and sites within them, and differed with species. Sites with consistently high juvenile densities were identified as important juvenile sites (i.e. putative nursery grounds). Through generalized linear models (GLM), intra-estuarine variation in occurrence and density of each of the individual species was largely explained by environmental variables (temperature; salinity; depth; percentage of mud in the sediment; presence of seagrass; importance of intertidal areas; relative distance to estuary mouth; macrozoobenthos densities; and latitude). Decisive environmental factors defining important sites for juveniles varied depending on the system as a result of different environmental gradients, though there were common dominant features for each species regardless of the estuary considered. Analysed environmental variables in the GLM also accounted for inter-estuarine variation in species' occurrence and density. In several estuaries, the identified important juvenile sites were used by many of these species simultaneously and may be of increased value to both management and conservation. Overall, the variability in site features amongst estuaries highlighted the tolerance of these species to different available environmental conditions and provided fundamental information for future spatially explicit modelling of their distribution. This should ultimately enable the prediction of species response to habitat alterations.  相似文献   

浙江沿岸张网中主要经济幼鱼发生量与当年渔汛渔获量的关系   总被引：4，自引：0，他引：4  

周永东  徐汉祥  刘子藩 《海洋学研究》2009,27(3):54-60

通过对1998～2005年浙江中北部沿岸3个张网监测点的渔业监测调查,阐述了浙江沿岸张网渔业中的主要经济幼鱼带鱼、小黄鱼、鲳鱼的渔获量比例月变化;同时结合浙江省的渔业统计资料和主要鱼种的生物学测定资料,以张网渔业中主要经济鱼种的平均网获量作为预报当年渔汛补充群体渔获量的主要影响因子,经回归统计分析,分别建立了带鱼和小黄鱼的渔获量单因子预报方程.结果表明:2000～2005年,张网中的带鱼、小黄鱼、鲳鱼3种主要经济鱼类幼鱼合计占总渔获量的月平均比例达22.79%,6～8月为幼鱼的出现高峰期,月平均比例为53.86%,7月份达到最高值,为62.66%.其中5～9月幼带鱼占渔获量的月平均比例范围为11.42%～46.42%,6～11月小黄鱼占渔获量的月平均比例范围为9.73%～14.30%,4～8月鲳鱼占渔获量的月平均比例范围为3.32%～6.52%.设5～9月张网中幼带鱼的日平均网获量(X,kg/网)与当年9～12月渔汛中带鱼补充群体的渔获量(Y,×108尾),经相关分析,可以得到Y关于X的一元一次、一元二次和一元三次函数的预报方程.设6～10月张网小黄鱼幼鱼的日平均网获量(x,尾/网)与当年浙江省小黄鱼的渔获量(y,万t),经相关分析,可以得到y关于x的一元一次、一元二次函数的预报方程.预报方程的相关系数和预报精度基本符合应用要求,表明沿岸产卵场和索饵场附近的张网渔获物中主要经济幼鱼的发生量与当年渔汛补充群体渔获量密切相关.张网渔业的监测调查可以反映当年主要经济幼鱼发生量情况,应加强对沿岸张网渔业的管理及保护主要经济幼鱼.  相似文献   

慢性氨氮胁迫对鲻鱼(Mugil cephalus)幼鱼组织细胞免疫指标的影响研究   总被引：1，自引：0，他引：1  

蒋玫  李磊  沈新强  吴庆元  牛俊翔 《海洋与湖沼》2014,45(3):529-535

以鲻鱼(Mugil cephalus)幼鱼为研究对象,研究低浓度氨氮长时间胁迫对组织细胞免疫指标和遗传物质代谢的影响。实验分0.35、0.7、1.5和3mg/L氨氮处理组,分别于0、5、10、15、20d取样并进行相关指标测定。结果显示:肝脏和鳃丝的丙二醛(MDA)含量表现出先上升后下降的趋势,MDA活性与氨氮浓度呈一定的正相关。氨氮对MDA的影响具有不同组织和不同时序的选择性。不同浓度氨氮胁迫下,鳃丝和肝脏Na+-K+-ATP活性均呈现先升高后降低,并随着时间的增加逐渐趋于稳定。Na+-K+-ATP活性与氨氮浓度呈一定的负相关性,尤其是3mg/L处理组与对照组差异性显著(P0.05)。在氨氮浓度0.7mg/L和1.5mg/L时,肌肉中RNA/DNA均表现出不同程度的增加,各浓度组与对照组差异不显著;而高浓度(3mg/L)比值基本无变化。肝脏和鳃丝的Na+-K+-ATP酶的mRNA表达量,在氨氮胁迫第5d时检测到达最高,随后表达量缓慢回落,实验20d除3mg/L处理组表达量仍高于对照组水平外,其他处理组均降至对照组水平。Na+-K+-ATP酶的表达水平变化趋势与Na+-K+-ATP活性基本一致。结果表明,在一定浓度的氨氮长时间胁迫作用下,抗氧化免疫系统和肌肉中的核酸代谢受到了一定的影响。  相似文献