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半滑舌鳎(Cynoglossus semilaevis Gunther)属鲽形目、舌鳎科、舌鳎属,俗称牛舌头、鳎目、鳎米,是一种暖温性近海大型底层鱼类,终年生活栖息在我国近海海区,具广温、广盐和适应多变的环境条件的特点,适温范围3.5~32 ℃,最适水温14~24 ℃,适盐范围14‰~33‰,是非常理想的池塘增养殖品种. 相似文献
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半滑舌鳎(Areliscus semilaevis Gunther)属鲽形目、舌鳎科、舌鳎属,俗称牛舌头、鳎目、鳎米,是一种暖温性近海大型底层鱼类,终年生活栖息在我国近海海区,具广温、广盐和适应多变的环境条件的特点,适温范围3.5~32℃,最适水温14~24℃,适盐范围14‰~33‰。半滑舌鳎食物层次低,能耐低氧,病害少,是一种有前途的养殖品种。 相似文献
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半滑舌鳎(Cynoglossus semilaevis Günther)属鲽形目、舌鳎科、舌鳎属,俗称牛舌头、鳎目、鳎米,是一种暖温性近海大型底层鱼类,终年生活栖息在我国近海海区,具广温、广盐和适应多变的环境条件的特点,适温范围3.5 ̄32℃,最适水温14 ̄24℃,适盐范围14% ̄33‰。半滑舌鳎自然资源量少,味鲜鲜美,出肉率高,口感爽滑,鱼肉久煮而不老,无腥味和异味,属于高蛋白,营养丰富,历来为我国沿海广大消费者待客的上等佳品,深受广大消费者青睐。加之,半滑舌鳎生长速度快,食物层次低,能耐低氧,病害少,是我国目前最具发展潜力的土池养殖海水品种。近年来,由于渔… 相似文献
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正半滑舌鳎(Cynoglossus semilaevis Günther)俗称牛舌头、鳎目、鳎米、隶属于鲽形目,舌鳎科,舌鳎亚科,舌鳎属,三线舌鳎亚属,是一种暖温性近海大型底层鱼类,栖息于我国近海海区,尤以渤海、黄海为多,具广温、广盐和适应多变的环境条件的特点。半滑舌鳎冬季可在4℃水温下安然越冬,夏季可以承受32℃的水温,适宜生长水温为16~28℃,且生长速度随温度上升而增长,最适盐范围14~33。半滑舌鳎具有海产鱼类在营养上显著的优点,含有较高的不饱和脂肪酸,蛋白质容易消化吸收。其肌肉细嫩, 相似文献
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半滑舌鳎(Cynoglossus semilaevis Gunther)属鲽形目、舌鳎科、舌鳎属,俗称牛舌头、鳎目、鳎米,是一种温暖性近海大型底层鱼类,终年生活栖息在我国近海海区,具有活动范围小、营养等级低、个体大、生长快等优点。其味道鲜美,出肉率高,口感爽滑,鱼肉久煮而不老,无腥味和异味,高蛋白,营养丰富,历来为我国沿海广大消费者待客的上等佳品,深受广大消费者青睐。由于近年的过度捕捞及近海水域污染,这一重要的渔业资源遭到严重破坏,资源量逐渐减少,目前活鱼价格很高。半滑舌鳎具有广温、广盐和适应多变的环境条件的特点,适温范围3.5℃~32℃,最适水温… 相似文献
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半滑舌鳎又称为鳎板鱼,属鲽形目,舌鳎科、舌鳎属,适应盐度在10%‰~34‰,温度在4℃~32℃,最适生长盐度在15%~25%,温度在15℃~25℃,pH值7.8~8.6。该品种通常生长在自然海水中,原来在中国近海特别在连云港至赣榆海域较多,但由于过度捕捞等原因,资源量明显降低。半滑舌鳎属于杂食性鱼类,食量小且病害少,商品价格贵,肉质鲜美, 相似文献
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猪的胎盘属于弥散型胎盘,这种胎盘的结构特点和饲养管理的不当,常常导致母猪胎衣不下发生,给生猪的生产繁殖带来极大损失。本文针对母猪胎衣不下发生病因、综合防治进行详细阐述,旨在对预防和治疗胎衣不下能有所帮助。 相似文献
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The variation of virulence of Renibacterium salmoninarum , the causative agent of bacterial kidney disease (BKD) in salmonid fish, was studied by infecting rainbow trout, Oncorhynchus mykiss (Walbaum), with two isolates (strains 325 and 932) from diseased Atlantic salmon, Salmo salar L., and one isolate (strain 4366) from an apparently healthy Atlantic salmon. Coho salmon, Oncorhynchus kisutch (Walbaum), were injected with the strain 932 to estimate difference in fish species resistance. Fish were removed by random sampling for other study purposes, a study design possible with analysis of lifetime distributions incorporating both sampling-, death- and survival-times. At the end of the experiment, the rainbow trout infected with strains 325, 932 and 4366 had a survival probability of 33%, 51% and 72%, respectively. The coho salmon infected with strain 932 had a 26% survival probability. The strain differences were significant according to the log-rank test, and the risk ratio between the strains ranged from 1·8 to 5·4. The strain from the apparently healthy fish was least virulent. The survival of the fish species was different over time. Rainbow trout were more likely to die early in the time course, but high numbers of coho died later, resulting in an overall risk of mortality of 1·4 in favour of rainbow trout. Differences in virulence may reflect changed selective pressure on R. salmoninarum when introduced from feral stocks into the environment of fish farms. 相似文献
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水硬度对七彩神仙鱼幼鱼发育的影响 总被引:4,自引:0,他引:4
采用不同硬度的水对七彩神仙鱼幼鱼进行饲养。6周龄幼鱼在硬度为7.94°dH±0.30°dH时饲养84d后,比在硬度为14.71°dH±0.23°dH水中的幼鱼个体大,生长速度快。表明较高硬度的水有利于七彩神仙鱼幼鱼的生长发育。 相似文献
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虎斑乌贼受精卵卵黄营养成分分析 总被引:3,自引:3,他引:0
本实验对虎斑乌贼受精卵卵黄的营养成分进行分析,旨在探讨其幼体的营养需求量,为其幼体配合饲料研制提供参考数据。随机选取大约800个虎斑乌贼受精卵的卵黄,采用国家标准方法测定其水分、灰分、粗蛋白质、粗脂肪、氨基酸、脂肪酸和矿物元素含量。结果表明:1)虎斑乌贼受精卵卵黄中粗蛋白质含量为76.33%(干重基础);总氨基酸(TAA)和必需氨基酸(EAA)含量分别为71.22%和32.38%(干重基础),EAA/TAA为45.46%,氨基酸中以谷氨酸(Glu)含量最高(9.97%),必需氨基酸中亮氨酸(Leu)含量最高(7.58%)。2)其粗脂肪含量12.71%(干重基础);共检出17种脂肪酸,包括8种饱和脂肪酸(SFA)、5种单不饱和脂肪酸(MUFA)和4种多不饱和脂肪酸(PUFA),SFA、MUFA和PUFA分别占脂肪酸总量的43.47%、7.54%和49.25%,其中以DHA含量最高,达32.80%,EPA含量为7.70%,DHA/EPA为4.26。3)检测出Na、K、Ca、Mg、Sr、Mn、Fe、Cu、Zn、Al和As 矿物元素,微量元素中富含Zn、Al和Fe,含量分别为 0.77、0.71和0.43 mg/kg(鲜重基础)。由此可见,卵黄具有高蛋白、低脂肪,富含n-3PUFA的特点;虎斑乌贼幼体饲料中蛋白质需求量参考值为76.33%;氨基酸需求量参考值,如赖氨酸(Lys)为5.49%,蛋氨酸(Met)为2.63%;脂肪的需求量参考值为12.71%,DHA为4.17%,EPA为0.98%;微量元素需求量参考值,如Zn为2.77 mg/kg,Cu为0.19 mg/kg(干重基础)。 相似文献
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该研究通过肉眼观察、镜检,进行干露、饥饿、盐度突降、福尔马林等抗性试验,并采用病毒检测等方法,以期建立评估斑节对虾(Penaeus monodon)虾苗活力和质量标准。结果表明,斑节对虾健康虾苗具有趋光性、集群性,体表光洁,肌肉透亮,肠胃食物充盈等特性。测试虾苗干露时间以15min为宜,健康虾苗干露后能立即恢复活力,而病弱虾苗多出现死亡、昏迷现象;虾苗的成活率随饥饿时间的延长而降低,随福尔马林浓度升高和时间延长而降低,随盐度突降幅度增加而降低。健康虾苗能忍受100~200μL·L^-1福尔马林溶液30min,成活率近100%;在盐度20~30下虾苗的成活情况较好,而其在淡水中仅能存活1h。对虾苗进行病毒检测,可以避免养殖中因虾苗携带病毒而可能导致的病毒性疾病的暴发。 相似文献
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鳟鱼发眼卵和旨种运输是养鳟生产的重要环节。发眼卵多在冬季和早春运输,苗种多在晚春和夏季运输。苗种运输大多以鱼篓充氧进行短距离汽车运输,长途运输冷水性鱼苗种的实例很少。本文总结了金鳟和虹鳟苗种长途运输方法,以期与养鳟业界共同交流提高。一、包装材料和方法内包装材料是苗种运输专用塑料袋,规格54×104cm,外包装是泡沫塑料箱,规格63.5×45.5×30.5cm,纸箱规格64×46×32.5cm。塑料袋采取双层式,内装苗种和水共12.5kg,其中苗种0.5-1.3kg,100-2000尾。起运前苗种停食1-2天。运鱼用水水温调至6℃,鱼、水入袋后袋内… 相似文献
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《水生生物资源》2003,16(5):461-465
Anti-proteinase activity was demonstrated in the seminal plasma of cyprinid fish species (bream, chub, ide, dace, asp, goldfish, roach, common carp) using electrophoretic techniques combined with a detection method based on inhibition of bovine trypsin. We found species-specific protease inhibitors in the seminal plasma of cyprinids. At least three bands of protease inhibitors with different migration rates could be identified by native PAGE. Higher variability was characterized for bands with slower migration rates. Visualization of inhibitors after SDS-PAGE under non-reducing conditions allowed estimation of their molecular weights. Apparent molecular weights were within the range of 51–59 and 47–54 kDa for the bands with slower and moderate migration rates, respectively. The molecular weight of fast migration bands for roach and common carp were estimated to 23 and 30 kDa, respectively. Inhibitors of common carp seminal plasma differed in their affinity toward serine proteases. Three inhibitors in common carp seminal plasma could be visualized using cod and bovine trypsin, but only two inhibitors (of high molecular weight) were recognized with chymotrypsin. There were differences in anti-proteinase activity and seminal plasma protein concentration in relation to the origin of common carp seminal plasma (breeding lines) and time of milt collection (spawning vs. post-spawning season). 相似文献
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在分析海口市海洋渔业资源和海洋捕捞现状的基础上,提出了近海渔业资源衰退的6项原因和加快保护和修复资源的10项措施和建议。 相似文献
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T. K. Banerjee 《Fish physiology and biochemistry》2007,33(4):441-454
Air-breathing fishes have evolved bimodal respiratory mechanisms for exploitation of water (through gills and highly vascularized
skin) as well as atmospheric air (through aerial respiratory organs, ABO). Mucous cells in these respiratory organs of variously
stressed fishes exhibit periodic fluctuations in their density and staining properties. The main types of damage in the gills
include congestion of blood capillaries (BLCs), periodic lifting and sloughing of respiratory epithelia of the secondary lamellae
causing haemorrhage, extensive fusion of secondary lamellae and hyperplasia of the respiratory epithelia due to uncontrolled
regeneration leading to asphyxiation, altered excretion, and death of the fish. Haemolysis has also been observed following
lead exposure. The damage in the ABO of Heteropneustes fossilis includes sloughing of the epithelial cells, leading to haemorrhage causing decreased red blood corpuscles density and degeneration
of the secondary gill lamellae with reduced respiratory area. Subsequent hyperplasia of the respiratory epithelia and fusion
of gill lamellae increase the respiratory barrier distance. The BLCs often bulge out and protrude into the lumen, bringing
blood nearer to air. The ladder-like pillar cell (PLC)-BLC components of the gill lamellae frequently collapse. Damage to
the ABO of Channa striata is less severe. Often haemorrhaging due to bursting of extensively stretched BLCs causes aerial respiratory failure. Chloride
cells of the ABOs also show hyperplasia. While the highly mucogenic epidermis of C. striata shows less damage, the epidermis of Clarias batrachus and H. fossilis shows severe wear and tear, sloughing, and haemorrhage. Side-by-side regeneration continues, causing altered histomorphology
of the epidermis. The different gland cells also show periodic fluctuations in their density and staining. The dermis also
shows severe damage with loosening of their connective tissue fibres. These fibres give stronger reactions for sulfated mucin
that not only retain additional water molecules for continuance of skin breathing, but also bind the toxic ambient pollutants. 相似文献