共查询到20条相似文献，搜索用时 468 毫秒
1.
引进杂交鲆苗种在宁德市三都海区,经过385d的网箱养殖,达到商品规格,平均全长36.3cm,平均体重606g,成活率达71%,饵料系数为8.3.研究表明,杂交鲆在生长速度、抗逆性、适应性等方面有较明显的优越性,能适应闽东海域夏季高温和冬季持续的低温.以Keys氏公式W=aLb,拟合养殖13个月杂交鲆的平均全长L(cm)... 相似文献
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为探索斑石鲷(Oplegnathus punctatus)养殖技术,引进斑石鲷(体长6 cm、体质量约6 g)进行室内水泥池的幼鱼培育和海区网箱养殖,经过六个月的养殖试验,结果表明:经125 d的室内水泥池幼鱼培育,斑石鲷幼鱼平均体质量达120.3 g/尾,日增重0.91 g;移至海区网箱养殖61 d后平均规格达243... 相似文献
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2008年4月21日在4口共80m2网箱养殖巴西鲷,放养平均规格11.5g/尾鱼种2万尾,经过178d的养殖,10月16日收获商品鱼6940.6kg,平均单产86.8kg/m2,成活率95.6%,饵料系数1.73,平均利润593.9元/m2,投入产出比为1∶1.84。 相似文献
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利用传统渔排网箱和深水网箱养殖卵形鲳鲹,从生长、收获及经济效益方面对比其养殖效果。养殖124d的结果如下：传统网箱养殖卵形鲳鲹鲂收获时的平均体重、饵料系数、成活率和单位产量分别为350．2g/尾、2．26、80．3％和12．98kg／m^3,深水网箱分别为421．1g/尾、2．05、91．2％和17．28kg/m^3。养殖成本传统网箱和深水网箱分别为17．93元,kg和17．10元／kg,产值分别为264．6元/m^3和346．0元／m^3,开4润分别为31．9元/m^3和50．4元,m^3。试验结果表明,深水网箱养殖卵形鲳鲹比传统网箱生长快,饵料系数低,成活率较高,经济效益也优于传统网箱。 相似文献
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试验采用鸡肝在网箱中饲喂野生长吻鮠。放养的6338尾长吻鮠鱼种的平均体长为14cm,平均尾重65g,经过196~204d的饲养,共收获长吻鮠6002尾,总产4513.5kg,平均体重0.752kg/尾,成活率94.7%,饲料系数5.1,投入产出比1∶1.65。 相似文献
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利用山涧水开展流水养殖黑脊倒剌鲃,在128m2水泥池中放养规格为10-11尾/kg的鱼种1042kg(10560尾),养殖密度82尾/m2.经271d养殖,收获平均体重511g的倒剌鲃商品鱼5039kg,净产量3997kg;饵料系数2.58,养殖成活率93.34%,净单产31.24kg/m2,利润119.05元/m2,投入产出比为1∶1.78,取得较好的经济效益. 相似文献
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自广东省中山市购入史氏鲟空运至青岛市城阳区进行放养，经过120天的饲养管理，结果平均体长61.5cm，平均体重967g，成活率95％以上，饵料系数为1.9，为淡水养殖结构调整提供了新品种。 相似文献
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通过对均重1225g的大规格高体鰤苗种进行252天的深水网箱养殖，高体鱼师的平均体重由1225g增至3350g，共收成鱼5521尾，养殖成活率92．02％，杂鱼饵料系数7．76。 相似文献
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雪野水库网箱养鳜鱼试验 总被引：2，自引：0，他引：2
１９９７年７￣１０月在莱芜市雪野水库设置２７只网箱,进行鳜鱼养殖试验。总产鱼１２９５９．３ｋｇ,平均尾重１．２ｋｇ,商品率８６．５％,平均单产１９．２ｋｇ／ｍ＾２,最高单产２３ｋｇ／ｍ＾２,投入产出比为１：２．５７。试验认为,饵料鱼规格应控制在鳜鱼体长的４０％￣５５％,在网箱中设置隐蔽物,采用饱食投喂法,可以提高成活率,降低饵料系数。 相似文献
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比较投饵率水平分别为3%、4%、5%、6%时,对暗纹东方鲀幼鱼生长、饲料效率的影响,以确定暗纹东方鲀幼鱼阶段的适宜投饵率。在23℃下,对规格为3.45～3.56g的暗纹东方鲀幼鱼进行30d的生长实验,结果表明:不同投饵率对暗纹东方鲀幼鱼的特定生长率、质量相对增加率、饲料效率、存活率均有显著影响(p<0.05);暗纹东方鲀幼鱼的适宜投饵率为4%,在投饵率为4℅时,质量相对增加率为116.04±0.04%,饲料效率达83.70±0.02%,特定生长率为111.49±0.03%/d,存活率为84.44±0.02%。 相似文献
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《Journal Of Applied Aquaculture》2013,25(3-4):73-82
Abstract Rainbow trout, Oncorhynchus mykiss, were raised in culture cages (1 m3) to determine the effect of stocking density on growth, survival, and percentage of market-size fish. Large fingerling rainbow trout (20-25 cm, 232 g average weight) were stocked into six cages located in a 0.4-ha pond. Two stocking densities (100 or 200 fish/cage) were used, and fish were grown for 140 days (2000-April 2001). Average total harvest weight (35.0 kg) in the low-density cages was approximately one-half the average total harvest weight (61.2 kg) in the high-density cages. Average weight gain (11.7 kg to 15.1 kg) and feed conversion (1.2 to 1.5) were also smaller for the low-density cages. Average survival was 96.7% for the low-density cages and 94.2% for the high-density cages, with the percentage of market-size fish (< 29 cm) averaging 50.3% and 52.0%, respectively. Production costs for the actual experiment and the revenues from fish sold at the end of the study were collected. An enterprise budget based on the experimental results for the two densities was developed to determine if a culture operation of this size would produce a net return. Production costs and revenues from the experiment resulted in a large negative return (-$3,124) and high breakeven price ($13.53/kg). 相似文献
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在盐度28~30、水温23.6~25.8℃下,将54只初始体质量(34.82±3.79)g的健康短蛸放入500mL矿泉水瓶中,瓶体周身均匀钻直径5mm小孔约80个,每瓶1只,悬挂在4.1m×6.6m×1.4m养殖池中,投喂菲律宾蛤仔、缢蛏和肉球近方蟹3种饵料,每种饵料3个平行组,比较分析3种饵料对短蛸生长的影响。28d的饲养表明,3个饵料组的成活率均为100%,但投喂肉球近方蟹的短蛸特定生长率(1.67%/d)和饵料转化效率(33.46%)显著高于投喂缢蛏(1.33%/d,14.01%)和菲律宾蛤仔(1.31%/d,19.57%)的短蛸(P0.05)。试验结果表明,蟹类是短蛸养成阶段较理想的饵料。 相似文献
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An experiment was conducted in a randomized block design to compare growth and economic performance between monosex and mixed-sex culture of red mud crab ( Scylla olivacea Herbst, 1796) fed with trash fish at 5–10% body weight per day in the mangrove tidal flat at Burigoaliny Union of Satkhira District, Bangladesh. The experiment had three treatments in triplicate each: (a) all-male culture, (b) all-female culture and (c) mixed-sex culture. Crabs of 80–120 g in size were stocked at a density of 0.5 crab m−2 and cultured for 100 days. Specific growth rates (SGRs) by weight and internal carapace width (ICW) in the all-male culture were significantly higher than those in the all-female culture ( P <0.05), while SGRs in the mixed-sex culture showed no significant differences from those in the all-male and all-female culture ( P >0.05). No significant differences in final mean body weight, ICW, daily weight gain, survival rate, gross and net yields were found among all the treatments ( P >0.05). The area of high water level with mangroves gave significantly better results in terms of feed conversion ratio, survival rate, gross and net yields than the area of low water level ( P >0.05). The experiment suggests that the all-female culture in the area of high water level with mangroves could be suitable in developing commercial pen culture of red mud crabs in Bangladesh. 相似文献
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2016年3月6日—5月3日,在福建省漳浦县霞美镇浮头湾外海域进行三种不同结构鲍匍匐基养殖对比试验。三种鲍匍匐基分别为扣箱式(有效匍匐面积1.072 8 m2)、双层斜板式(有效匍匐面积1.993 5 m2)和传统养殖盆(有效匍匐面积0.413 3 m2),试验对象为皱纹盘鲍杂交鲍(Haliotis discus hanai)。试验结果如下:1)扣箱式鲍壳长日增长为0.131mm,日增重为0.129 g,存活率为98.44%,饲料转化率为3.38%;2)双层斜板式鲍壳长日增长为0.098 mm,日增重为0.096 g,存活率为99.38%,饲料转化率为4.29%;3)传统养殖盆式鲍壳长日增长为0.115 mm,日增重为0.103 g,存活率为98.00%,饲料转化率为5.37%。试验设施未受到湾外海况影响破坏。结果表明扣箱式鲍匍匐基整体性能较好,基于该匍匐基的鲍养殖网箱在经济型吊杆辅助作业下具有养殖效率高、抗风浪流性好、劳动强度低、所需劳动力少等优点,适合应用于湾外养殖。 相似文献
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池塘网箱养鱼的可行性及技术研究 总被引：1，自引：0，他引：1
１９９５、１９９６年在精养成鱼塘设置网箱养殖商品湘鲫与乌鳢鱼种，采取灌排水形成微流、启动增氧机、投放耐低氧吃食性鱼类、投喂颗粒馈料和动物肉、勤刷钢箱养措施，结果：湘鲫养殖１３６天，从１５０ｇ长到６７０ｇ，平均日增重３．８２ｇ，２５ｍ＾２的网箱产成鱼３３４．３３ｋｇ。平均１３．３ｋｇ／ｍ＾２，成活率９９．８％，乌鳢种培育４２天，由体长１ｃｍ到１０ｃｍ，平均日增长２．１４ｍｍ，２０ｍ＾２的网箱，共育鱼 相似文献
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This research was conducted to investigate the effect of stocking density on the growth performance and yield of Oreochromis niloticus in cage culture in Lake Kuriftu. The treatments had stocking densities of 50 (50F), 100 (100F), 150 (150F), and 200 (200F) fish per m?3. All treatments were in duplicate. Juveniles with an average weight of 45. 76±0.25 g were stocked in the treatments. The fish were fed a composite mixture of mill sweeping, cotton seed, and Bora food complex at 2% of their body weight twice per day using feeding trays for 150 days in powdered form. The growth performance of O. niloticus was density dependent. The final mean weight of O. niloticus ranged 147.76±0.28–219.71±1.42 g and the mean daily weight gain was 0.69±0.01–1.15±0.02 g day?1. Fish held in cages with lower density were heavier than the ones held at higher densities, and showed higher weight gain and daily weight gain. The most effective stocking density, in terms of growth parameters, was 50 fish m?3. The gross yield (4.5–20.55 kg cage?1) showed a significant difference with increasing stocking density (P<0.05). Moreover, the apparent food conversion ratio (2.48–7.22) was significantly affected by stocking density (P<0.05). However, survival rate was not affected by stocking density (P>0.05). It can be concluded that the most effective stocking densities were at 50 fish m?3 cage for larger size fish demand in a short period and 200 fish m?3 for higher gross production with supplementary feed. 相似文献
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J. Estefanell J. Roo H. Fernández‐Palacios M. Izquierdo J. Socorro R. Guirao 《Journal of the World Aquaculture Society》2012,43(1):63-72
Recently most research on cephalopod culture has focused on the development of new specific enrichments for paralarvae and compound feeds for juveniles and sub‐adults. However, little research has been conducted in order to test new rearing systems, specifically designed to meet the particularities of these species. This experiment was set to compare the biological performance of Octopus vulgaris reared under traditional group conditions in floating cages (5 m3) and individually in net cages (80 L), in two successive ongrowing trials. Octopuses (1565 ± 263 g) were fed a mixed diet containing crab and fish during 60 d. In general, higher mortality was observed in octopus reared under group conditions (28.1–36.7%) rather than individually (0–12.5%), related to breeding behavior and to weight dispersion along both trials. This led to highest biomass increment in octopus reared individually. However, the group rearing system had a positive effect on growth, reflecting in higher biomass increment and food conversion rates until 40–50 d of rearing. Accordingly, in order to maximize profitability of traditional group on growing, periodic grading and selection of males during the reproductive period are recommended. In addition, no difference in proximate composition and fatty acid profile was found in muscle regardless of rearing system. 相似文献
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于2009年4月至2010年11月在平均水深18m、流速0.7m/s的福建省罗源湾岗屿海区,采用2口(c/)12.8m、入水深10m的深水网箱放养 110.3g/尾规格鱼种进行大黄鱼养殖试验.经19个月养殖,平均规格达到597.5g/尾,养成成活率约43.7％.试验结果表明:相对小网箱养殖,大黄鱼深水网箱养殖成品鱼体色... 相似文献