池塘条纹鲈养殖

条纹鲈又名条鲈、线鲈。本场自1997年引进之后,对此鱼的人工繁养技术进行了较深入的研究,现就其养殖技术总结如下。一、生活习性适温范围4～36℃,适宜生长水温为18～32℃,最适水温23～28℃,适盐范围0～35‰,适宜生长盐度1‰～25‰,最适范围1‰～15‰,可耐受盐度的急剧变化;能耐低氧,但适宜在5毫克/升以上水体生长。对pH耐受范围7～10,最佳范围7.5～8.5。二、池塘养殖1.池塘条件应选择水源充足、水质优良、注排水方便、通风条件良好的池塘。面积以3～10亩为宜,水深1.5～2米,淤泥少、最好为沙质底,配备1～2台增氧机。放养前需对池塘修整消毒,…     

条纹鲈池塘养殖技术

条纹鲈又称银花鱼 ,原产于美国。其个体大 ,适温范围广 ( 2～ 36度 ) ,最佳生长水温 2 0～ 2 9度 ,广盐性 ,易捕捞 ,食性杂(偏肉食 ) ,喜欢摄食人工配合饲料。成活率高 ,生长速度快 ,当年可养成。抗病力强 ,鱼体色鲜艳 ,肉质幼滑 ,口感极佳、营养丰富 ,商品价值高 ,是目前国内市场销售的新品种。当年夏花苗经 1个月左右强化培育后达 8～ 9ｃｍ规格 ,可放入池塘进行成鱼养殖 ,经 180天左右养成即可捕捞上市 ,每尾平均尾重达 40 0克 ,成活率 80 %,亩产可达 10 0 0公斤以上 ,具有较高的养殖价值。1　池塘选择 :选择水源充足 ,水质清新 ,无污染…     

美国条纹鲈杂种养殖技术

本文介绍了美国条纹鲈杂种的催产孵化,苗种运输及放养饲料投喂,疾病防治等养殖技术。     

条纹鲈池塘养殖初试

一、材料与方法1.池塘选择选择城郊连片商品鱼塘,面积5.3亩,池塘呈东西走向、长方形,水源充足,水质良好无污染,有进排水系统,池塘可蓄水1.8米,沙泥底质,池底平坦,池堤牢固,池底淤泥20厘米。池塘配备1.5千瓦叶轮式增氧机一台。鱼种放养前15天注水15厘米,每亩池塘用生石灰60千克化浆后全池泼洒,以     

美国杂交条纹鲈池塘养成试验报告

我所于 2 0 0 1年引进一批美国杂交条纹鲈水花培育I级苗种试验成功以后 ,对其继续进行了越冬观察和试验获成功。随后 2 0 0 2年又对该批越冬鱼种继续进行了池塘高效养成试验 ,经 6个月的精心饲养和管理 ,对其生理生态习性、食性和生长获得初步资料 ,高效养殖获得成功     

杂交条纹鲈池塘养殖试验

杂交条纹鲈是雌性条纹鲈与雄性白鲈杂交的子一代,具有显著的杂种优势,因其体侧有沿身体纵向排列的7～8道条纹而得名.该鱼生长快,个体大,抗病力强,广温广盐,可自然越冬,海、淡水均可养殖,是一种肉味鲜美的食用鱼类和理想的垂钓对象.近年来,对其生物学特性和池塘鱼种培育及成鱼养殖技术进行了试验研究,取得了良好效果,并通过了验收.现将试验情况报告如下:     

长丝鲈池塘养殖试验

长丝鲈(Osphronemusgoramy)原产于印度尼西亚爪哇岛,为东南亚特产淡水鱼类,具有肉质细嫩、味道鲜美、食性广泛、生长快速、群体产量高等优点,是一种既可观赏又可食用的热带优良养殖鱼类。我国近年来少量引进试养,有关长丝鲈的养殖技术尚处于研究摸索中。泉州市水产技术推广站20     

美国条纹鲈的养成技术要点

名优淡水养殖品种美国条纹鲈,又称银花鱼,原产于美国。我国台湾早有养殖,并形成规模;大陆则于90年代中期引进试养成功,近几年方在一些地方大面积推广养殖。 美国条纹鲈属广温广盐鱼类,在2℃～38℃的范围内均可生存,最适生长温度为18℃～30℃,在淡水或半咸水条件下均可养     

杂交条纹鲈生物学特性及池塘苗种培育技术

苗杂交条纹鲈是由雌性条纹鲈与雄性白鲈杂交而成，这种杂交称为“原型杂交”，此杂交种产生的初期被称为“棕榈鲈”。近年来通过雌性白鲈与雄性条纹鲈杂交产生了新的杂交种，称此种为“阳光鲈”。目前，杂交条纹鲈在美国游钓领域已被广泛接受。近几年，我国台湾、内陆等地区已引进了杂交条纹鲈，养殖效果很好。一、生物学特性１．外部形态杂交条纹鲈的外形特征介于其双亲之间。体形侧扁，体侧具条纹，胸鳍和侧线下半部的条纹断断续续。具有两个背鳍，第一背鳍具８～９根硬棘，紧连其后的第二背鳍具１根硬棘和１３～１４根鳍条。尾鳍叉形，分…     

花鲈的池塘养殖技术

花鲈，又俗称寨花，原是海水养殖品种，近几年来，通过人工驯化也可以在淡水中生长。花鲈因具有生长迅速、病害少、效益高．肉质鲜美的优点而受到养殖者的青睐，市场价格高，养殖前景广阔。     

The Cryopreservation of Striped Bass Morone saxatilis Semen

Abstract.— Two experiments were designed to improve upon existing methods for cryopreserving striped bass Morone saxatilis , semen. In the first experiment, two extenders, two cryoprotectant concentrations, and two freezing rates were evaluated on the basis of post-thaw semen motility after 1, 7, and 30 d of storage at −196 C. Semen samples cryopreserved at a freezing rate of −40 C/m resulted in a significantly higher percentage of motile sperm ( P < 0.001) and longer duration of spermatozoa motility ( P < 0.001) than samples cryopreserved at a freezing rate of -30 Chin. Also, the cryoprotectant dimethyl-sulfoxide yielded a significantly higher percentage of motile sperm ( P < 0.001) and longer duration of spermatozoa motility ( P < 0.001) when a 5% concentration was used instead of 7.5%. In the second experiment, the two extenders from Experiment I were re-evaluated and a new extender, which was a modified version of Extender 1, was tested. The samples were cryopreserved at -40 C/min with 5% DMSO and thawed in a 25 C water bath. Spermatozoa motility and fertilization ability were evaluated, and semen cryopreserved in Extender 2 yielded the longest duration of spermatozoa motility ( P < 0.001). the highest percentage of motile sperm ( P < 0.001). and the highest percentage of fertilized eggs ( P < 0.002) in comparison to Extenders I and 3.     

Age-Related Sperm Quality of Captive Striped Bass Morone saxatilis

Three groups of captive-reared striped bass Morone saxatilis ages 1, 3 and 12 yr, were examined for age-related changes of sperm characteristics including short-term storage. All groups had similar ranges of the following parameters (mean× SEM): expressible milt (5.6× 0.5 mI/kg body weight (BW) to 7.5× 2.1 mL/kg BW), percentage of motile sperm (55× 6% to 60× 2%), duration of sperm motility (69× 3 sec to 72× 5 sec) and percentage of viable sperm (91× 2% to 93× 2%). Compared to the 1 and 12-yr-old fish, the 3-yr-old fish produced the greatest number of spermatozoa (1,190× 370× 10⁹ spermatozoa/kg), sperm concentration (120× 8 × 10⁹ spermatozoa/mL) and spermatocrit (74× 4%). In addition, during short-term storage at 4 C, extender-preserved sperm samples of the 3-yr-old group showed a significantly higher ( P < 0.05) percentage of motile sperm and duration of sperm motility, compared to the other two groups. This suggests that short-term storage may be affected by the age of the male fish. Sperm longevity of the 3-yr-old group was successfully maintained for as long as 15 d, longer than that of the 1-yr-old group (9 d) and 12-yr-old group (7 d). Overall, the 3-yr-old fish appeared to have superior sperm quality than the 1 or 12-yr-old fish based on higher sperm production and increased sperm longevity.     

Dietary Phosphorus Requirement of Juvenile Striped Bass Morone saxatilis1

Three experiments were performed in single-pass, flow-through systems to determine the dietary phosphorus requirement of striped bass Morone saxatilis. In Experiment 1, three semi-purified diets were formulated to contain 0.20, 0.40, or 0.60% total phosphorus (entirely from animal protein) and were fed to striped bass having an average initial weight of 321 g. After 14 wk of feeding, significant differences in bone and scale mineralization were found among treatment groups. At a level of 0.40% dietary phosphorus there was a significant improvement of serum calcium (Ca) and tissue mineralization. In Experiment 2, five diets were formulated with graded levels of monopotassium phosphate to yield total phosphorus levels of 0.15 (no P supplementation), 0.35, 0.55, 0.75, and 0.95% and fed to juvenile striped bass initially weighing an average of 7.9 g. After 6 wk, significant improvement in scale and vertebral mineralization occurred when fish were fed diets containing at least 0.55% phosphorus. Improvements were observed in growth, serum phosphorus, incidence of scoliosis, survival, and feed efficiency when the diet contained at least 0.35% P. In Experiment 3, the dietary phosphorus levels fed were 0.30, 0.38, 0.46, 0.54, and 0.62% total phosphorus using graded levels of monopotassium phosphate. Diets were fed to striped bass fingerlings initially weighing an average of 48 g. After 10 wk, significant improvement in scale, vertebral, and dorsal fin mineralization was observed when dietary phosphorus was at least 0.46%. A summary of the broken-line regression analyses of the data from these experiments indicated that the average total dietary phosphorus level required for optimal growth and mineralization of striped bass was 0.58%.     

Quantitative Dietary Threonine Requirement of Juvenile Striped Bass Morone saxatilis

A 10-wk feeding trial was conducted to quantify the dietary threonine requirement of juvenile striped bass Morone saxatilis . The basal diet was analyzed to contain 42% crude protein with a calculated digestible energy (DE) level of 3,200 kcal/kg. L-threonine was added to the basal diet to yield five dietary treatments of 0.61, 0.81, 1.00, 1.18, and 1.40% available threonine on a dry-matter basis. Weight gain, specific growth rate (SGR), feed conversion ratio (FCR) and apparent nitrogen utilization (ANU) were significantly ( P < 0.05) affected by dietary threonine concentrations. Least-squares regression analysis of weight gain, SGR, FCR, and ANU indicated dietary threonine requirements (±SE) of 1.00 ± 0.19, 0.91 ± 0.11, 1.06 ± 0.09 and 1.13 ± 0.22% of dry diet, respectively. From these results, the average recommended dietary threonine requirement of juvenile striped bass is 1.03% of dry diet, 2.45% of dietary protein or 3.22 mg/kcal DE.     

Seasonal Variations in Fatty Acids of Striped Bass Morone saxatilis

The polyunsaturated fatty acids of the n-3 family associated with fish and fish oils have been shown to have beneficial effects on prevention of heart disease in humans. However, in considering the potential health benefits of fish oil in human health, it is important to realize that the fatty acid composition and total lipid content of fish vary greatly. These variations may be due to species differences or variations within a species due to temperature, diet, developmental stage, sex or seasonal differences. The purpose of the study described here was to determine the effects of season, size class, and sex on the Occurrence of individual fatty acids in striped bass (Morone saxrrtilis). Fish were collected in June, July, August, September, and October. Filets with skin were analyzed for total lipid content. Methyl esters of fatty acids were separated and identified using capillary gas chromatography. Total mean lipid varied from as low as 12% to as high as 30%. There were no significant changes in total crude lipid content due to month collected or sex. However, total lipid content of filets increased significantly (P ≤ 0.05) as size increased. The fatty acids 18:1n–9 and 16:0 made up the majority (62%) of the fatty acids present in any season, size class, or sex. The monounsaturated fatty acids dominated in all fish. There were no significant differences in individual fatty acids due to sex. However, fish size had a significant influence on fatty acid composition. Overall, saturated fatty acids decreased as size increased, while polyunsaturated fatty acids increased or remained constant. There were no significant changes in mean percent saturated or monounsaturated fatty acids with respect to month when controlling for size. However, total percent polyunsaturated fatty acids decreased significantly in October compared to August and September. This overall decrease was due mainly to a decrease in 22:6n–3. Conversely there was a significant increase in 16:11n–9 in October. All other fatty acids remained constant. When data from this study were compared to fatty acid data from the literature, striped bass was not as good a source of 20:5n–3 and 22:61n–3 as sardines, anchovies or mackerel.     

Sperm Characteristics of Precocious 1-year-old Male Striped Bass Morone saxatilis

Abstract.— Captive-reared, 10-mo-old, male striped bass Morone saxatilis were sampled monthly for testicular development between February and June 1994. One of the five males sampled in February showed precocious testicular development and had a gonado-somatic index (GSI) of 1.26%. while the other four fish had immature testes with a mean GSI ± s^x, of 0.17 ± 0.03%. Spermiating individuals were present from April to June. In April the average body weight (BW) of spermiating males was 65 ± 4 g and their GSI reached a mean value of 4.75 ± 0.52%. In June, milt collected from ten precocious males contained motile spermatozoa with a mean of 31 ± 7% of the sperm showing forward movement. Mean milt volume and sperm concentration were 1.67 ± 0.41 mL/kg BW and 92.3 ± 1.8 ± 10⁹ spermatozoa/mL. respectively. These data show that male striped bass reared in captivity can reach sexual maturity during their first year. This is one year earlier than previously reported for striped bass in mid-Atlantic regions.     

杂交条纹鲈苗种培育技术试验

根据对引进的美国杂交条纹鲈的生长发育需求及生理生态要求和食性，应用我国池塘精养技术，肥水培育苗种，进行调控水质，培养天然饵料，精心投喂，科学管理，经1年饲养管理，共出塘鱼种26000余尾，平均全长达14．0cm，平均尾重31．9g，成活率达22．7％。得出初步的苗种培育技术。     

对虾育苗池饲养条纹鲈商品鱼的试验

条纹狼鲈(Morone saxatilis),又名条纹石鮨、条纹鲈、线鲈、淡水石斑等,隶属于鲈形目、鲈科、狼鲈亚科,是一种溯河性鱼类。条纹狼鲈是美国的一种传统养殖鱼类,生长速度快,对环境适应性强,尤其对盐度及水温的适应范围广,适宜在淡水及咸淡水中饲养。山东省东营市渔业技术推广站自2001年6月30日开始试验,利用室内对虾育苗池饲养条纹狼鲈,并获得成功。现将试验情况报告如下:     

Apparent Problems and Potential Solutions for Production of Fingerling Striped Bass,Morone saxatilis

Data on production of fingerling striped bass, Morone saxatilis, in 103 ponds at 17 hatcheries in 1988 were related to information on management practices and water qualities. Production was highly variable, with a median of 50,000/ha. No survival was evident in 12% of ponds; numbers harvested exceeded 250,000/ ha in 5% of ponds. Best survival resulted when larvae were stocked within 2 days after pond filling was started and at hatcheries with relatively low application rates of fertilizers during the prestocking interval. No survival was evident in ponds with pH >9.0 in the week after stocking. High pH's and probably toxic concentrations of un-ionized ammonia were related to water being in ponds for too long prior to stocking and to high applications of fertilizers. Examination of samples of larvae collected at stocking and the week after stocking documented a problem with swim bladder inflation. When larvae were stocked at D5 or D6 (Dl is day of hatch), inflation success averaged 91%: when stocked at ≥D7. inflation success averaged 60%. Measures proposed to improve production include: (1) Stock larvae prior to the critical period of swim bladder inflation(D4-D5). (2) Start filling ponds as close to stocking as is feasible (filling can be completed after stocking). (3) If the concentration of available nitrogen is low, apply no more than 300 µg/L of nitrogen in the prestocking interval. (4) Add phosphorus as needed, but avoid pH>8.5 until larvae are D14.