A short note on the intensive culture of eel (Anguilla anguilla L.)

Preliminary experiments in intensive culture showed the possibility of raising healthy eel with obvious growth in water of moderate temperature, when fed a special diet.     

A note on the hybrid mrigal,Cirrhinus mrigala (Hamilton) × common carp,Cyprinus carpio (Linnaeus) (Cyprinidae)

Mrigal-common carp hybrids were produced and examined. Only few hybrids could be reared up to the age of 14 months. These did not show signs of maturity. The parents species mature in ponds in 6 months (common carp) or 12 months (mrigal).     

Effect of the addition of diatoms (Navicula spp.) and rotifers (Brachionus plicatilis) on water quality and growth of the Litopenaeus vannamei postlarvae reared in a biofloc system

The aim of this study was to evaluate the effect of the addition of Navicula spp. and Brachionus plicatilis on water quality and growth of postlarvae shrimp Litopenaeus vannamei reared in a biofloc system. Four treatments were considered: a control (biofloc system – BFT); BFT with the addition of Navicula spp. (BFT‐N); BFT with the addition of Brachionus plicatilis (BFT‐B) and BFT with the addition of Navicula spp. and Brachionus plicatilis (BFT‐NB), each in triplicate. Shrimp (16.2 ± 0.03 mg) were stocked at a density of 2500 shrimp m^?3 and plankton were added on days 1, 5, 10, 15, 20, 25 and 30 at a density of 5 × 10⁴ cells mL^?1 (Navicula spp.) and 30 organisms L^?1 (Brachionus plicatilis). The shrimp were fed a formulated feed in four daily rations composed of 40% crude protein and 8% lipids. Significant differences between treatments were observed for final weight, yield, feed conversion ratio, specific growth rate, protein efficiency ratio and protein content of the shrimp. The combined plankton addition of Navicula spp. and B. plicatilis had better performance parameters, indicating their benefit as natural food sources for postlarvae L. vannamei in biofloc systems.     

5种营养盐对富油舟形藻生长的影响

为了优化舟形藻最佳生长条件,以水生硅藻培养基为基础培养基,对培养基中N、P、Si、C、Mg 5种营养盐进行了优化,采用单因子试验和L16(45)正交设计法进行优化.试验结果表明,舟形藻的最适氮源为尿素,5种营养盐的最佳质量浓度为:尿素50 mg/L,K2HPO4·3H2O 40 mg/L,Na2SiO3· 9H2O 200 mg/L,NaHCO3 10 mg/L,MgSO4·7H2O 70 mg/L,因此在后续试验中均以此培养基配方进行藻体培养.     

Effect of the addition of Chaetoceros calcitrans,Navicula sp. and Phaeodactylum tricornutum (diatoms) on phytoplankton composition and growth of Litopenaeus vannamei (Boone) postlarvae reared in a biofloc system

The aim of this study was to evaluate the effect of the addition of Chaetoceros calcitrans, Navicula sp. and Phaeodactylum tricornutum (diatoms) on phytoplankton composition and the growth of Litopenaeus vannamei postlarvae reared in a biofloc system . Four treatments were used: BFT (biofloc system without feed and no addition of diatoms); BFT‐F (biofloc system with feed and no addition of diatoms); BFT‐D (biofloc system with the addition of diatoms and no feed); and BFT‐FD (biofloc system with the addition of feed and diatoms), all in triplicate. The shrimp (16 ± 0.02 mg) were stocked at 2500 postlarvae m^?3 and fed a commercial feed. Diatoms were added on the 1st, 5th, 10th and 15th day at a density of 5 × 10⁴ cells mL^?1 for each species. No significant differences (P > 0.05) between treatments were observed for gross primary production, net ecosystem production and water column respiration rate. However, significant differences (P < 0.05) were observed for nitrite, orthophosphate, alkalinity, final weight, weight gain, yield, feed conversion ratio (FCR), phytoplankton and cyanobacteria composition. The BFT‐FD treatment had better performance parameters for final weight (270 mg), weight gain (254 mg), yield (0.67 Kg m^?3) and FCR (0.61), indicating the benefits of the diatoms C. calcitrans, Navicula sp. and P. tricornutum for decreasing cyanobacteria and improving growth of L. vannamei postlarvae reared in biofloc systems.     

卵形鲳鲹低盐度养殖试验

卵形鲳鲹(Trachinotus bolchii),地方名金鲳、黄腊鲹,属鲈形目,鲹科,鲳鲹属.我国东南沿海均有分布,为广盐、暖水性中上层鱼类.     

美国红鱼养殖技术报告

<正> 美国红鱼(Sciaenops,ocellolue)属鲈形目、石首鱼科。为美国大西洋沿岸及墨西哥湾重要经济鱼类。国家海洋局于1991年7月从美国得克萨斯首次引进,1996年人工繁殖成功。该鱼具有生长速度快,单产高,适温、适盐范围广,耐低氧能力强,饲料来源广泛等优点。唐海县十里海养殖场自1998年开始利用对虾养殖池试验示范养殖美国红鱼并取得了成功。 1 池塘选择     

三疣梭子蟹越冬养殖试验

<正> 三疣梭子蟹现已成为北方地区一个重要的养殖品种。近几年,我们利用秋季海捕的蟹苗在虾池中进行了梭子蟹的越冬养殖试验,养成时间为当年的9月份至翌年的5月份,该地区冬季海水表层水温最低为2℃,虾池中表层水温最低为-2℃,池水表面偶有轻微结冰。该试验连续进行了4年,养殖的梭子蟹成活率高、经济效益好。现将试验结果总结如下:     

白斑狗鱼养殖试验

白斑狗鱼俗名“鸭咀鱼”,土著名“乔尔泰”,是新疆特产亚冷水性鱼类,属鲑形目、狗鱼科、狗鱼属。该鱼经济价值高,病害少,易养殖,周期短,一年即可达到上市规格,且营养丰富,味道鲜美。2004年4月中旬,我们从新疆引进白斑狗鱼受精卵,在本地孵化育苗并养至商品鱼。现把养殖经验和养殖过程中遇到的问题总结如下,以供参考。     

日本对虾养殖技术之一日本对虾冬季蓄养技术措施

近年来,沿海地区各海水育苗场家积极开展多品种综合育苗,不断提高海水育苗设施的利用效率,但是,在冬季,除少数育苗场从事越冬生产外,大部分育苗场的生产设施基本处于闲置状态。为有效利用冬季育苗设施,我们利用闲置的育苗温室进行了日本对虾的冬季蓄养,取得了较好的生产效果和较高的经济效益。一、温室准备蓄养日本对虾最好利用闲置的对虾育苗池及温室。放养前,要对闲置日久的温室进行全面整理,修补棚顶及门窗,检修供排水与充气管道系统,以及其他配套设施设备,以确保正常的运行状态。此外,温室的棚顶和四周要增加保温及调光覆盖设施。二、蓄…     

暗纹东方鲀的养殖技术之一暗纹东方鲀规模化人工繁殖综合技术

暗纹东方■Ｔａｋｉｆｕｇｕｏｂｓｃｕｒｕｓ（Ａｂｅ），隶属■形目、■科、东方■属，俗称河豚，是我国长江水域重要的渔业资源。河豚作为一种极为名贵的高档水产品，在沿江两岸市场销量大，目前天然捕捞量已远远满足不了市场需求。为满足消费、保护资源，作者自１９９５年至今连续数年开展了暗纹东方■人工繁殖与养殖的研究工作，现已由原先的试验阶段发展成为较完善的规模化开发综合技术。本文即是暗纹东方■规模化人工繁殖技术的全面总结。一、亲鱼的收集１．收集时间与地点在每年３月份～４月份从南通至南京江段的捕获个体中选购。由…     

防空洞内养殖大鲵技术的初步研究

大鲵属两栖纲、有尾目、隐鳃鲵科。主要生活于高山溪流中,我国许多省份都有分布,由于资源量急剧下降,已被国家列为二级保护水生野生动物,国内一些单位相继开展了大鲵的人工养殖和繁殖工作,本文首次报道我所在防空洞内养殖大鲵的情况。１材料与方法１１养殖的大鲵全...     

池塘大面积养殖加州鲈高产技术

加州鲈学名大口黑鲈 ,隶属鲈形目 ,太阳鱼科 ,黑鲈属。原产于美洲的淡水河、湖中 ,二十世纪八十年代引入我国 ,我市于 1987年开始养殖。该品种适温范围在 2～ 35℃ ,最适生长温度为 2 0～ 2 5℃ ;水中溶氧需在 4mg L以上 ;食性以肉食为主 ,兼食其它。加州鲈适应性强 ,生长较快 ,可单养 ,也可套养。加之其肉质细嫩、味道鲜美 ,市场需求量大 ,价格较高 ,因而养殖效益明显 ,是近年来重点推广养殖、市场适销对路的名优水产品之一。现将我市在 2 0 0 2年实施的池塘大面积养殖加州鲈高产技术报告如下。1　材料与方法1.1　材料池塘系本市安昌河沿…     

池塘养殖大口鲶鱼技术

<正> 大口鲶原名南方大口鲶,俗称河鲶(SilurusMeridiondlis chen)。主要产于我国长江流域的大江河中,是一种以鱼为食的大型经济鱼类,常见个体2～5kg。由于其具有个体大,生长快,肉质鲜嫩无细刺,广温耐寒等特点,故深受消费者和养殖者喜爱,为推广该项技术,2000年我们在秦皇岛     

细基江蓠繁枝变种与遮目鱼的混养试验

细基江蓠繁枝变种 (GracilariatenuistipitataV .liui)俗称细江蓠 ,在我国主要分布在海南岛 ,也是海南省海藻栽培的重要品种 ,细江蓠生长快 ,产量高。遮目鱼 [ChanosChanos(Forstal) ],生长迅速、饵料易得 ,鱼苗病害较少 ,易于饲养 ,是咸淡水养殖的重要对象。关于细江蓠与遮目鱼的混养迄今尚未见报道。 2 0 0 1～ 2 0 0 2年我们在兴发养殖场进行了细江蓠与遮目鱼混养的探索性试验 ,现将其初步结果总结如下。1　材料与方法1 .1　池塘条件　池塘面积 0 .2ha,池深 1 .2m ,底质为泥砂底 ,池端设有一进排水闸门 ,有海淡水水源。1 .2　清塘放苗…     

大西洋鲑(Salmo Salar)苗种饲养试验

本文对从国外引种的两批大西洋鲑发眼卵进行了孵化、仔鱼和鱼种饲养试验。孵化率达98.5％,仔鱼成活率64％,体重30克鱼种的成活率为32％。作者结合具体实验条件,尽量采用国外成熟技术,对结合点上发展的一些问题进行了探讨。     

日本沼虾养殖过程中氨基脲存在特征研究

为探究不同生长时期养殖日本沼虾(Macrobrachium nipponense)体内氨基脲(Semicarbazide,SEM)的存在特征与变化规律,从养殖池塘采集不同生长时期日本沼虾样品,对各组织中SEM含量进行测定。结果表明:不同生长阶段日本沼虾样品中均有SEM检出,肌肉、甲壳、附肢、眼柄、鳃、肝胰腺中总SEM含量分别为(6.88±0.15)～(17.11±0.62)、(107.30±1.10)～(306.09±8.69)、(243.90±8.55)～(532.31±26.27)、(85.27±3.19)～(122.82±2.60)、(48.43±2.13)～(85.60±1.33)、(13.51±1.15)～(25.94±1.78)μg/kg,呈现:附肢>甲壳>眼柄>鳃>肝胰腺>肌肉的含量分布特征。SEM在肌肉和肝胰腺中主要以游离态形式存在,游离态SEM所占平均比例分别为67.35%和72.4%,在甲壳、眼柄、附肢、头胸部和鳃中主要以结合态形式存在,结合态SEM所占平均比例分别为89.50%、87.16%、85.68%、80.48%和73.30%。...     

海水网箱养殖褐菖鲉试验

宁德三都澳海区褐菖鲉(Sebasticus marmoratusCuvier)经375 d不同方式的网箱养殖比较,与大黄鱼混养的褐菖鲉个体平均体重增重量达80.9 g,成活率72.8%;单养Ⅱ网箱底部投放石莼等活体藻类,褐菖鲉个体增重量为71.0 g,成活率72.5%;单养Ⅰ只放养褐菖鲉,个体增重量为61.6 g,成活率67.1%。生长速度和成活率:混养单养Ⅱ单养Ⅰ,可知褐菖鲉与大黄鱼混养效果最好。水温高于26℃,褐菖鲉极易死亡,采取网箱底部投放大型活体藻类、不投饵或少投饵、不更换网衣等度夏措施是养殖成功的关键。     

A note on the behaviour of adult Atlantic halibut, Hippoglossus hippoglossus (L.), in cages

Abstract. Observations of adult Atlantic halibut, Hippoglossus hippoglossus (L.), behaviour in cages were made with underwater camera and video recording equipment. Significantly more fish ( P < 0·01) were found on the cage bottom than in the water column, fish tending to congregate around the outside rather than in the centre of the cage. During rough weather, the cage bottom was observed to heave violently and proportionately fewer fish remained on the bottom, those which did adopting an arched body posture with heads and tails not in contact with the cage bottom. Around 25% of the caged fish were active at any time, most of the active fish remaining close to the cage surface or bottom, with little use being made of the remaining cage volume. Fish were observed to swim in a circular pattern close to the cage walls (mean velocity 0·53 m/s), maintaining such behaviour for periods of up to 5min with little change in swimming speed. Whilst all food types were ingested, items delivered directly lo the cage bottom were taken only if detected within the first minute or so. The implications for rearing Atlantic halibut in conventional cages are discussed.     

哲罗鲑的集约化流水养殖

本文对利用泉水集约化养殖哲罗鲑的生长情况、饵料系数、养殖成活率、病害防治进行了总结,并进行了养殖密度和饲料对比试验.经过323d的养殖,哲罗鲑从初始时的1.59g/尾增长到1020g/尾,达到了上市标准,养殖成活率84.84%,饵料系数0.86;密度和饲料实验表明放养800尾/池的哲罗鲑能够获得较好的效果,且投喂进口饲料的哲罗鲑饵料系数0.92,每Kg鱼饲料成本9.05元,投喂国产饲料的哲罗鲑饵料系数1.05,每Kg鱼饲料成本7.66元;影响哲罗鲑的主要疾病是小瓜虫病、烂鳃病和出血病,要提早预防.