首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 148 毫秒
1.
网箱养殖大黄鱼两种间距分级栅分级效果的比较   总被引:3,自引:0,他引:3  
宋利明 《水产学报》2006,30(6):785-790
对770尾网箱养殖大黄鱼的生物学参数体宽(B)、体长(L)与体重(W)进行测定,运用幂函数拟合方法获得体重与其他两个参数的关系方程。为了达到按重量300 g的分级要求,选择体宽为确定分级栅间距的依据,运用几何形态法、logistic曲线模型方法确定分级栅间距的理论值为34.66 mm,用幂函数拟合方法得理 论值为38.21 mm。分级试验采用平均间距为33.01 mm、37.95 mm二种规格分级栅,对大黄鱼分级,结果表明:经过5~10 min分级,间距33.01 mm分级栅留存的大黄鱼中,达到分级标准的鱼(W≥300 g)的最高比例为50.00%,平均为42.96%,留存下的鱼的平均体 重296 g;间距37.95 mm的分级栅,留存的渔获中,体重高于300 g的最大比例为73.33%,平 均为43.76% ,留存下的鱼的平均体重310 g。使用平均间距37.95 mm的分级栅,在周长为48 m的深水网箱中进行分级操作后,留存的大黄鱼中,最小鱼体重为320 g,分级效果良好。同时也表明用幂函数拟合方法计算分级栅间距比用几何形态法、Logistic曲线模型方法计算出的分级栅间距进行分级的效果要好。  相似文献   

2.
不同网箱饲养条件下湘云鲫生长的研究   总被引:2,自引:0,他引:2  
鲁双庆  刘臻 《淡水渔业》2003,33(6):23-25
在 6m× 4m× 2 5m、 2m× 2m× 2 5m的两组 6口网箱中按 195尾 /m2 、 15 0尾 /m2 、 115 /尾m2 三种密度投放湘云鲫 ,大、小网箱分别投喂含粗蛋白质为 35 2 %和 30 0 %的两种饲养。两个月的养殖试验表明 :大网箱的高、中、低密度养殖的平均增重倍数分别是 0 5 8、 0 81、 0 6 3,饲料平均转化效率分别是 4 4 %、 4 7%、4 3% ;小网箱的高、中、低密度养殖组的平均增重倍数分别是 0 2 5、 0 4 1、 0 34,饲料平均转化效率分别是4 3%、 4 4 %、 4 2 %。对比试验表明用粗蛋白质含量为 35 2 %的饲料投喂 ,密度为 15 0尾 /m2 左右的大网箱养殖效果最好  相似文献   

3.
2 0 0 1年设置 2m× 2m× 2 5m网箱 6只 ,其中 3只放养密度为 4 0 0尾 /m3 ,鱼种规格 2 2cm ;另 3只放养密度为 5 0 0尾 /m3 ,鱼种规格 2 7cm ,试验期 180d。 2 0 0 2年设置 2m× 3m× 3m网箱 6只 ,3只一组。一组放养密度为 375尾 /m3 ,鱼种规格 4 0cm ;另一组放养密度为 4 17尾 /m3 ,鱼种规格 6 5cm ,饲养期16 0d。 2 0 0 1年成鱼起捕平均规格为 0 17kg/尾 ,单位产量 6 2 6kg/m3 ,成活率 80 9% ,单位箱体纯收入996 6 7元 /m3 。 2 0 0 2年成鱼起捕平均规格为 0 2 4kg/尾 ,单位产量 87 1kg/m3 ,成活率 90 7% ,单位箱体纯收入 10 90 6元 /m3 。试验证明 :全雄太阳鲈适合高密度的网箱养殖。  相似文献   

4.
花鲈网箱养殖高产技术试验研究   总被引:1,自引:1,他引:0  
针对福建省网箱养殖的现状及存在的问题,通过改进网箱的设置和布局,在网箱间设置流水通道,以改善养殖系统的小生态环境;把3m×3m×4m或4m×4m×4m的网箱,改为6m×6m×5m的大规格网箱;制作软颗粒饲料投饵花鲈;改进日常管理操作如换网、洗网、点数的工具和方法;建立病虫害综合防治制度等技术:总结出了一套切实可行的花鲈网箱养殖的高产技术。2年的养殖实验结果表明,每个6m×6m×5m的网箱每年可养殖花鲈1225-1545kg,日平均死亡率小于1‰。  相似文献   

5.
刘好 《海鲜世界》2002,(1):15-15
加州鲈又名大口黑鲈,是一种名贵淡水鱼类,具有适应性广、生长快、病害少、肉味美、营养丰富、商品价值高、养殖效益好等特点。现将加州鲈商品鱼网箱养殖技术介绍如下: 一、网箱规格 加州鲈商品鱼养殖网箱一般采用2×3或3×3聚乙烯线编织而成,为便于操作其设计规格为4m×5m×2m或4m×7m×2m,入水深1.5m。网目大小视鱼种放养规格  相似文献   

6.
试验总结了在网箱中用配合饵料养殖草鱼的技术,试验网箱5个,网箱规格6m×6m×3m ,网目3cm ,每箱投放16 .5~2 0cm的草鱼种30 0 0尾,经173d的饲养,共收草鱼17710kg ,获利2 .2 1万元,平均体重1.2 9kg ,成活率91.5 % ,投入产出比1:1.2。  相似文献   

7.
翘嘴红鱼白(Erythroculterilishaeformis)是丹江口水库的肉食性名贵鱼类,肉质鲜嫩深受消费者喜爱,由于捕捞强度及其他因素影响,天然资源日趋减少。而市场需求越来越旺。2000年至2001年我们进行了翘嘴红鱼白的网箱养殖试验,规格5~7cm的野生苗种两年养到1000g以上,取得了较好的经济效益。1网箱设置鱼种网箱为4m×4m×2m,由网目为0.8cm的无结节网片加工而成。网箱设置在丹江口水库库区淅川县水产局河套内的网箱基地。箱架用油桶钢管焊接成6m×6m框架,每12箱为一组。网箱区常年保持水深在4m以上。2鱼种来源从2000年6月20日至7月18日,用网目为0…  相似文献   

8.
缩短饲养周期,是降低集约化养鱼成本的重要途径之一。为此,1991年我们在达县市莲花湖水库和邻水县大洪河水库开展了鲤鱼苗当年养成食用鱼的网箱试验,获得了显著的效益。1 试验方法1.1 网箱设置不同饲养阶段选用不同的聚乙烯网箱(见表1)。网箱规格均为4m×4m×2m。以楠竹为框架支撑网箱,并将其固定于工作浮桥两侧,网箱间距2m。  相似文献   

9.
中华倒刺耙地方名青波、青板、乌鳞 ,属于鲤科、鲤亚科的鱼类 ,主要分布在长江上游的干、支流中。它个体大、生长快、食性广、耐低氧、抗病力强 ,喜欢生活在流水环境中。因肉质细嫩、味道鲜美、营养丰富深得人们喜爱。 2 0 0 3年我们根据中华倒刺耙的习性 ,结合本地区的气温 ,进行了网箱养殖中华倒刺耙的试验 ,取得了显著的经济效益。1材料与方法1 .1网箱的结构与设置网箱结构为 5m× 4m× 2 .5m双层结构 ,内层为无结聚乙稀网箱 ,四周网目为 0 .8cm ,外层为3m× 3m聚乙稀保护箱 ,网目为 3cm。网箱设置于黎城湖上游 ,避开主河道 ,设置点水深 …  相似文献   

10.
网箱培育鳜鱼种的驯食技术   总被引:2,自引:0,他引:2  
焦岗湖渔场是安徽省水产养殖的龙头企业 ,其中焦岗湖湖区有可养水面 4 0 0 0hm2 以上 ,围网养殖业十分普遍。近年来 ,又开展了网箱养殖鳜鱼、斑点叉尾鱼回等名优鱼类 ,取得了可喜的成绩。为满足湖区渔民对大规格鳜鱼种的需求 ,2 0 0 2年我们在湖区设置网箱培育鳜鱼种试验 ,通过精心驯养 ,获得成功。1 材料与方法1 1 试验材料1 1 1 水域选择试验点选在焦岗湖西湖区近岸一角 ,平均水深3 2m ,水体透明度 80cm左右 ,水质清新 ,水面开阔。1 1 2 网箱设置网箱总计 8只 ,闭口式 ,规格 2m× 2m× 2m ,网箱用毛竹设置成固定式 ,网箱上口高出水面5…  相似文献   

11.
分级对银鲫生长和个体大小差异的影响   总被引:1,自引:0,他引:1  
熊瑛  王岩  李翠 《水产学报》2007,31(2):220-225
在室内水槽进行12周的饲养实验以检验分级对银鲫生长和鱼群内个体大小差异的影响。用隔网将实验水槽分为两部分,每个水槽内放养10尾大鱼(体重8.0~9.0 g)和10尾小鱼(体重6.5~7.5 g),分级时将个体大小相近的10尾鱼分布在隔网同一侧。实验中,3组鱼分别隔1周、2周或4周分级1次,1组鱼不进行分级作为对照。鱼摄食率和生长率随分级间隔时间缩短而降低。实验结束时,隔1周分级1次的鱼体重低于对照组,隔4周分级1次的鱼体重与对照组无显著差异。实验结束时被分级的鱼群中大鱼体重的变异系数高于小鱼,表明大鱼对分级操作更敏感。本实验结果表明,分级未能明显提高银鲫生长速度和降低鱼群内个体大小的差异程度。  相似文献   

12.
淡水鲨鱼形态性状与体质量关系的初步研究   总被引:1,自引:0,他引:1  
选取1龄淡水鲨鱼(Pangasias sutchi Fowler)30尾,测量其体质量、全长、体长、体高、体宽、眼间距、头长、头高、头宽、吻长、尾柄长和尾柄高等12个形态性状,采用相关分析、通径分析和逐步回归分析的方法研究了各性状对体质量的影响效果。结果表明,(1)经相关分析,淡水鲨鱼各形态性状(除吻长)与体质量的相关系数均达到极显著水平;(2)经通径分析,保留了全长、头宽、体宽和尾柄高4个达到显著水平的形态变量,所得相关指数为:R2=0.939;(3)经逐步多元回归分析,建立最优回归方程为:Y=-458.204+0.997X1+6.610X8+2.506X4+2.825X11,式中X1、X8、X4、X11分别为全长(mm)、头宽(mm)、体宽(mm)和尾柄高(mm),为淡水鲨鱼的育种工作提供了重要的理论依据。  相似文献   

13.
海水网箱养殖长鳍篮子鱼的摄食与生长特性   总被引:4,自引:1,他引:3  
于2005年10月至2006年5月对海水网箱养殖长鳍篮子鱼(Siganus canaliculatus)的摄食与生长特性进行了研究。结果表明,长鳍篮子鱼主要栖息于水体中下层,喜结群,易受惊,活动能力较强,具有争抢食物的习性,喜摄食网衣上附着的藻类。初始体重17.8±3.2 g的长鳍篮子鱼经187 d养殖,平均体重达68.4 g,日均增重0.27 g,平均瞬时增重率为0.72%。长鳍篮子鱼的生长速度受水温影响明显,采样阶段平均水温23.0℃时瞬时增重率达到最高值2.10%,当水温降到16.0℃以下时,瞬时增重率出现最低值0.22%。长鳍篮子鱼的全长与体长呈线性关系,相关方程式为:LT=0.7228LB+5.6424;体长与体重呈幂函数关系,相关方程式为:W=0.00002L3.0559,其生长属于等速生长类型。  相似文献   

14.
为探究马口鱼(Opsariichthys bidens)形态性状与体质量之间的相关程度,对4月龄马口鱼的14个形态性状(全长X1、体长X2、叉长X3、体高X4、体宽X5、头长X6、头宽X7、头高X8、吻长X9、眼后头长X10、眼径X11、眼间距X12、尾柄长X13、尾柄高X14)和体质量(Y)进行了相关分析、通径分析及回归分析,并建立了多元线性回归方程及最佳拟合模型方程。结果显示,4月龄马口鱼体质量与14个形态性状呈正相关,相关性全部达到极显著水平(P<0.01);通过通径分析发现全长对体质量的直接作用最大(0.380);决定系数分析显示5个性状对体质量的共同决定系数总和为0.972,说明全长、体长、体高、体宽和头长对4月龄马口鱼体质量具决定作用;通过多元回归分析,构建了以全长、体长、体高、体宽和头长为自变量,体质量为因变量的回归方程:Y=-17.814+0.123X1+0.132X2+0.324X4+0.288X5-0.209X6。结果表明,马口鱼的全长、体长、体高、体宽和头长等5个形态性状对体质量直接作用达极显著水平。  相似文献   

15.
为解决浅海围网设施养殖鱼类的捕捞和分级,以浮绳式围网养殖为研究对象,根据养殖围网设施的结构和大小、敷设技术和主要性能,结合围网养鱼方式和养殖生产的特点,设计并制作了一种分级捕捞网箱。网箱由框架钢筋、网衣、绳索、分级栅等构件制作而成,网箱网身呈圆柱形,顶部呈倒圆台形,整体高1 515 mm,体积约为1 m3,分为入鱼口、分级栅、取鱼口等3部分。在实验室用鲫鱼对分级栅进行了试验,结果表明,分级栅间距为15 mm和20 mm时,小规格鱼残留率平均为7.78%和4.75%,大规格鱼逃逸率平均为2.38%和3.00%。海上试验结果显示,大规格鱼捕获率90%以上。研究表明,通过日常投饵养鱼驯化将养殖鱼引诱至网箱内,通过提升网箱、驱使箱内小规格鱼群从分级栅游离,剩下的大规格鱼提出水面后迅速放入活鱼舱,从而达到捕大留小的目的。  相似文献   

16.
Heritability estimates with a microsatellite parentage assignment based pedigree are of special interest in common carp cultured under traditional pond conditions. This method reduces common environment effects as all families can be grown immediately after hatching mixed in the same pond. We applied this method to study genetics of growth and processing traits in common carp at market size (1.5 kg and more). The experimental progeny was established by crossing 147 two-year old males and 8 females (six to eight-year old) of Hungarian synthetic mirror carp population. The fish grew up through three vegetation seasons and at the end a sample of 331 fish was examined for biometrical traits (standard length, body weight, relative head length, relative body height, relative body width), percent fat and processing traits (% processed body, % fillets with skin, % fillets without skin). It was shown that sex had a significant effect on most traits: females were larger and fatter than males, and they had both higher percent processed body and percent fillet with skin. Standard length, body weight, percent fat and relative head length had a high heritability (> 0.5), while relative body height, relative body width, percent processed body and fillet yields had a medium heritability (0.2–0.5). We found relatively high positive genetic correlations between body size (standard length and body weight) and percent fat (0.71 and 0.59, respectively), favourable genetic correlations between body size and percent processed body (0.69 for standard length and 0.74 for body weight) and between body size and fillet yields (0.50–0.77). Genetic correlations between body size and body shape (relative head length, relative body height and relative body width) were weak to moderate, thus selection for better growth should have little impact towards more rotund shape. Relative head length had strong negative correlation (− 0.7 to − 0.9) with percent fat, percent processed body and percent fillet yields. This means that indirect selection for reduced relative head length should be effective in improving of fillet yield.  相似文献   

17.
近年来,张网渔具渔获中幼鱼比重大的问题突出,而使用放大网目等传统手段在一些场合下并不适用。本研究设计制作了一种新型刚性幼鱼释放装置,该装置由3个框架组合构成、框架使用铰链连接、外型呈Y型,并通过2014年冬季海上测试,分析这一装置对幼鱼的释放效果。海上对比试验结果显示,安装于张网囊头网部、不锈钢材料、栅栏间距2 cm、分隔框架与来流方向呈60°的装置能释放90%的幼鱼并同时保留大部分大个体渔获。该Y型幼鱼释放装置角度可调等特点使其功能得以扩展、适用性增大,可为今后开展过滤性渔具幼鱼释放研究提供参考。  相似文献   

18.
The System of Unwants Ramp-way Filtered-Bycatch Reduction Device (SURF-BRD) was developed to reduce shrimp bycatch in a shrimp beam trawl. It consists of a pair of rectangular net panels, namely, the front panel (FP) and rear panel (RP), and two fish escape vents. In this study, numerical models for expressing available selection by the SURF-BRD were proposed and assessed in several fishing experiments conducted using two types of the BRD: a prototype and an improved type with the BRD attached at a higher point on the side-nets . Contact probability and selectivity parameters of the FP and the RP for four major species were estimated for each BRD type. The improved type with the higher BRD showed a larger contact probability for the FP. Size selectivity of the FP and RP for two species (cinnamon flounder and spotted swimming crab) was almost equivalent to the mesh selectivity of the net panel, but that for lizard fish seemed to depend not on mesh size of the FP but on the swimming behavior of the fish. These results suggest that the smaller mesh size of the RP would be helpful for releasing more fish of smaller size and to exclude more spotted swimming crab, which hinder on-deck sorting by fishermen.  相似文献   

19.
Effects of daily feeding frequency, water temperature, and stocking density on the growth of tiger puffer, Takifugu rubripes, fry were examined to develop effective techniques to produce tiger puffer in a closed recirculation system. Fish of 4, 14, and 180 g in initial body weight were fed commercial pellet diets once to five times a day to apparent satiation each by hand for 8 or 12 wk at 20 C. Daily feeding frequency did not affect the growth of 14‐ and 180‐g‐size fish. However, the daily feed consumption and weight gain of the 4‐g‐size fish fed three and five times daily were significantly higher than those of fish fed once daily (P < 0.05). Fish of 4 and 50 g in initial body weight were reared with the pellet diet at 15–30 C for 8 wk. The weight gain of fish increased with increasing water temperature up to 25 C and decreased drastically at 30 C for both sizes. Similar trends were observed for feed efficiency, although 4‐g fish had highest efficiency at 20 C. Effects of stocking density on growth were examined with fish of 8, 13, and 100 g in initial body weight. Fish were reared with the pellet diet for 8 or 16 wk at 20 C. Fish were placed in floating net cages in the culture tank, and the stocking density was determined based on the total weight of fish and volume of the net cage. Fish of 8 g in body weight grew up to 35–36 g during the 8‐wk rearing period independent of the stocking density of 8, 15, and 31 kg/m3 at the end of rearing. Final biomass per cage reached 32, 60, and 115 kg/m3 for 13‐g‐size fish, and 10, 18, and 35 kg/m3 for 100‐g‐size fish, and the growth of the fish tended to decrease with increasing stocking density for both sizes.  相似文献   

20.
In an attempt to identify appropriate times for initial application of supplemental feed in polyculture fertilized fish production earthen ponds, a study was conducted for 19 wk to establish the growth performance, yield, survival, and body composition of Nile tilapia, common carp, and silver carp as influenced by four different feeding regimens (treatments). The four treatments were: 1) supplemental feeding beginning at onset of the experiment (T-I) (control treatment); 2) 6-wk delay of feeding after fish stocking (T-II); 3) 13-wk delay of feeding after fish stocking (T-III), and 4) no supplemental feed application (T-IV). Two ponds were assigned to each treatment and each pond was stocked with a similar number and weight of each fish species. A commercial pelleted fish feed (25% protein) was used to feed fish in T-I, T-II, and T-III at 3% of their body weight, twice a day. At the end of the experiment, fish species (except for silver carp) in T-II showed weight gain, growth rates, and yields significantly higher than fish in T-III or T-IV. Also, the total fish production and net profit in T-II were significantly higher than in T-III or T-IV. Fish species in T-II showed weight gain, growth rates, survival rates, and yields similar to those of T-I (control treatment) with no significant differences. The amount of feed consumed by fish in T-II was reduced by approximately 7.3% compared to that consumed by fish at T-I. Moreover, there was increase in th net profit in T-II by 4.8% over that achieved in T-I. Therefore, T-II appears to be the most appropriate among the tested feeding treatments and recommended for use in order to achieve the best growth, production, and net profit.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号