虾池海蜇巧混养

为探索在虾池中混养海蜇的可行性，２００２年６月份，日照市涛雒镇水产工作站选择了３个条件基本相同的海水虾池，分别进行了海蜇与梭子蟹、黑鲷、菲律宾蛤仔的混养试验。现将试验情况报告如下。一、准备工作１．虾池选择选择当地海水虾池３个，泥沙底质，进排水方便，最大水位１．８米，海水盐度２５‰左右。２．虾池改造海蜇放苗前对３个池塘进行了处理，清除了池底、池壁上的石块、木桩、铁丝等。用网眼１厘米、宽２米的鱼花网，离池壁１米，在池内环绕插一圈，以防止海蜇游到池边浅水区搁滩或在池壁上擦伤。二、幼蜇放养６月７日，由辽…     

海蜇混养试验

<正> 为探索在虾池中混养海蜇的可行性,2002年6月份,日照市涛雒镇水产工作站选择了3个条件基本相同的海水虾池,分别进行了海蜇与梭子蟹、黑鲷、菲律宾蛤仔的混养试验。现将试验情况报告如下。1 准备工作1.1 虾池选择 选择当地海水虾池3个,泥沙底质,进排水方便,最大水位1.8m,海水盐度25‰     

海蜇虾池混养试验

为探索在虾池中混养海蜇的可行性,2002年6月,日照市涛雒镇水产工作站选择了3个条件基本相同的海水虾池,分别进行了海蜇与梭子蟹、黑鲷、菲律宾蛤仔的混养试验。现将试验情况报告如下。     

海蜇养殖技术之三海蜇与对虾混养技术

2002年,辽宁省普兰店市开发养虾池混养海蜇12000亩,其中皮口镇养殖面积6500亩,总产量350吨,获产值380万元。这种养殖模式的开展,为今后北方地区养虾业发展,加快产业结构调整,降低养虾业风险,增加经济效益提供了新经验、新出路。一、混养池条件要求混养海蜇的虾池面积宜大不宜小,要求池底平坦,沙泥底质,保水性能良好,池底淤泥厚度不超过5cm。最好选择有淡水河流注入及岸边有虾场的虾池,水质要求肥沃无污染,海水盐度在20‰~26‰之间,进排水方便,虾池蓄水水位最低要达到1.5m以上。二、放苗前虾池处理虾池经过一个冬季冻晒后,要彻底清除池底及池…     

低产虾池混养海蜇关键技术

1 混养池的选择和技术要求 海蜇与对虾混养一般选择30亩以上直接纳潮的养虾池或盐厂一级蓄水池,盐度20-26之间,最低水位要达到1.5m以上,进排水方便,池壁陡峭,池底平坦较硬,无杂草。在下风头和不陡峭池坡内侧60cm水深处要设置合股线机织无结节(网目2cm)的挡网网墙,高于水面20cm。     

海蜇虾池高产养殖技术要点

海蜇养殖是一项投资少、见效快、效益高、风险小、适合大面积推广的新兴养殖业。辽宁省东港市近海是海蜇生长繁殖的原产地,也是虾池养殖海蜇面积最大的县,2005年养殖面积5万余亩,产量近6000t。为充分利用好虾池资源,大力推广海蜇高产养殖技术,提高虾池综合利用水平和经济效益,通过在东港地区5年虾池养殖海蜇的基础上,做了海蜇虾池高产养殖技术研究并获得成功,整理出海蜇虾池养殖高产技术要点,供广大养殖户参考。一、养殖池选择1.水源与水质养殖池应靠近海水水源,池塘进、排水方便,最好选择可以利用自然纳潮进、排水的池塘。另外,还应备有淡…     

鱼、虾、贝、海蜇同池混养技术

为了充分地发掘虾池资源潜力,使虾池的效益最大化,采用鱼、虾、贝、海蜇同池混养方式是一种有效途径.     

海蜇虾池高产养殖技术

为充分利用好虾池资源,大力推广海蜇高产养殖技术,提高虾池综合利用水平和经济效益,笔者在东港地区五年虾池养殖海蜇的基础上,做了海蜇虾池高产养殖技术研究并获得成功,整理出海蜇虾池养殖高产技术要点,供广大养殖户参考。一、海蜇养殖池选择1.水源与水质养殖池应靠近海水源,进     

池塘海参海蜇生态混养试验

为了充分利用养殖空间,实现渔业可持续健康发展,根据海参摄食底栖硅藻、海蜇摄食浮游动物的生态习性,2013年我们指导渔民开展了海参海蜇池塘生态混养模式的试验,海参年产量达到1 490kg/hm2,海蜇年产量达到3 300kg/hm2,经济效益显著。现将该技术模式总结如下。1池塘改造试验池塘面积约5.6hm2,长470m,宽120m,东西走向,距离海边较近,进、排水渠畅通,交通、电力方便,池底为沙泥质。     

海蜇人工养殖技术要点

海蜇是一项投资少、见效快、效益高、风险小、值得推广的养殖品种之一。海蜇以小型浮游生物为食,具有经济价值高、营养丰富、生长速度快等特点,2～3cm的海蜇苗,2个月左右体重碍达8～10kg。 辽宁省丹东市有虾池面积8000hm~2,2002年虾池海蜇养殖面积1133hm~2,产量1500t,取得较好效益。为充分利用好虾池资源,大力推广海蜇养殖,提高虾池综合利用水平和经济效益,笔者在丹     

Atlantic Fisheries Technological Conference,Moncton, NB,August 21, 1995

No abstract available for this article.     

Anguilla huangi Teng, Lin, and Tzeng, 2009, is a junior synonym of Anguilla luzonensis Watanabe, Aoyama, and Tsukamoto, 2009

Anguilla luzonensis and A. huangi were each described in 2009 using eels obtained from northern Luzon Island. We examined the taxonomic status of these two groups of eels using morphological and molecular genetic characters. There were no significant differences in two vertebrae counts between eels of A. luzonensis and A. huangi. Mitochondrial 16S ribosomal RNA and cytochrome b genes sequences were obtained and compared among 28 specimens of A. luzonensis, the holotypes of A. luzonensis and A. huangi, and one specimen of the other 15 anguillid species. The specimens of A. luzonensis exhibited almost identical sequences, including the holotype, with only a few site differences, and the genetic difference between the holotypes of A. luzonensis and A. huangi was within the range of differences of specimens of A. luzonensis. The other anguillid species were genetically very different from A. luzonensis and A. huangi, although A. interioris is a closely related species. It is clear that A. luzonensis and A. huangi are the same species, and according to the principle of priority in zoological nomenclature, A. luzonensis Watanabe, Aoyama, and Tsukamoto, 2009 is the valid species name, and A. huangi Teng, Lin, and Tzeng, 2009 is a junior synonym of A. luzonensis.     

Age,growth, maturity and the overfishing of the iconic sciaenid,Argyrosomus japonicus,in south-eastern,Australia

Mulloway (Argyrosomus japonicus) occur in estuarine and coastal waters surrounding Australia, Africa, India, Pakistan, China, Korea and Japan, where they are important in fisheries. This study identified that mulloway in south-eastern Australia had similar growth rates, but matured at smaller lengths and younger ages, to those in South Africa and Western Australia. Growth of both sexes was similar to about 5 years, after which females grew faster and attained a greater maximum length than males. Female mulloway matured at 4–5 years of age with a L₅₀ of 68 cm, whereas males matured at 2–3 years of age with a L₅₀ of 51 cm. The commercial fishery in New South Wales was characterised by declining catches and a reduction in the proportion of mulloway of mature lengths in landings. During 2002–2005 commercial landings were dominated (83%) by fish within 15 cm of the current minimum legal total length of 45 cm and aged 2 and 3 years (>80%), even though mulloway can attain lengths of 200 cm and live >30 years. Estimates of the rates of instantaneous total mortality ranged between 0.34 and 0.45, whilst the rate of instantaneous natural mortality (M) was estimated to be approximately 0.12. Yield-per-recruit analyses indicated that mulloway in New South Wales are being growth overfished and substantial increases in yield could be achieved by increasing the length at first harvest. Values of the spawning potential ratio were below 0.2 under a range of mortality estimates, suggesting that mulloway are at risk of recruitment overfishing. These results suggest that the spawning stock of mulloway in south-eastern Australia has been depleted and that remedial management action is required to protect this iconic species.     

Surface disinfection of Pacific threadfin, Polydactylus sexfilis, and amberjack, Seriola rivoliana, eggs

The effects of exposing the eggs of Pacific threadfin and amberjack eggs (AEs) to different concentrations of hydrogen peroxide for 5 min on hatch rate and survival were assessed in a series of experiments using a petri dish model rearing system. Despite significant inter‐batch variation in hatch rate, it was shown that eggs of both species could be safely exposed to up to 11 340 mg L⁻¹ H₂O₂ for 5 min. Exposure to 34 230 mg L⁻¹ H₂O₂ for 5 min was shown to be lethal to AEs at a late stage of development. In two further experiments, it was demonstrated that Pacific threadfin eggs were resistant to all tested concentrations of a range of polyvinylpyrrolidone iodine (PVP‐I) concentrations and contact times (up to 1000 mg L⁻¹ PVP‐I for 10 min). The level of bacteria adhering to the eggs of both species was highly variable. Where eggs were heavily colonized (>10⁴ cfu egg⁻¹), hydrogen peroxide concentrations of at least 11 340 mg L⁻¹, or PVP‐I concentrations higher than 500 mg L⁻¹ for 10 min, were required for effective sterilization. In less colonized batches, rinsing in sterile seawater or exposure to lower (550 mg L⁻¹) concentrations of H₂O₂ was sufficient to result in high apparent levels of surface sterility (<1 cfu egg⁻¹).     

Effects of Mosquitofish,Gambusia affinis,on Channel Catfish,Ictalurus puncatatus,Production Ponds

Mosquitofish, Gambusia sp., have been spread throughout the world to biologically control mosquitoes. However, the fish has gained a reputation as an invasive species and has been implicated in displacing native aquatic species. Gambusia affinis are native to the southeastern United States and commonly occur in commercial channel catfish, Ictalurus punctatus, production ponds. We investigated effects of mosquitofish presence on zooplankton populations, water quality, disease occurrence, and fish production in experimental ponds. There were no differences between ponds with or without mosquitofish in numbers of calanoid copepods, cyclopoid copepods, total copepods, Bosmina sp., Ceriodaphnia sp., Moina sp., Daphnia sp., or total cladocerans. There were also no differences in copepod and cladoceran sizes. Copepod nauplii were more numerous during the summer months in ponds with mosquitofish. There were no differences in water quality variables (soluble reactive phosphorus, nitrate, nitrite, ammonia, total nitrogen, total phosphorus, pH) or phytoplankton density between ponds stocked with and without mosquitofish. Catfish production and disease occurrence were also similar between ponds with and without mosquitofish. Although mosquitofish may cause problems when stocked outside their native range, there does not appear to be any adverse effects of mosquitofish presence in catfish production ponds.     

Compositional differences,antioxidant activity,angiotensin-converting enzyme inhibition,and sensory characteristics of kamaboko fermented in wheat,rice, brown rice,and soybean koji

Fisheries Science - Fermentation of kamaboko in koji with wheat (KW), rice (KR), brown rice (KB), or soybean (KS) was performed by simulation of tofuyo processing. Moisture and protein content...     

Sperm Motilities in Waigieu Seaperch,Psammoperca waigiensis: Effects of Various Dilutions,pH, Temperature,Osmolality, and Cations

The objectives of this study were to evaluate the effects of varying dilutions, pH, temperature, osmolality, and cations on sperm motility parameters in waigieu seaperch, Psammoperca waigiensis. The maximum velocity of average in path (VAP), percentage of motile cells (MOT), and duration of sperm motility (DSM) were observed when semen was diluted in artificial seawater (ASW) at a ratio of 1:100 (144.9 ± 0.6 µm/sec, 95.6 ± 0.4%, and 230.3 ± 2.3 sec, respectively), at 30 C (142.0 ± 0.6 µm/sec, 93.6 ± 0.4%, and 238.3 ± 0.9 sec, respectively), and pH 8 (144.8 ± 0.6 µm/sec, 93.3 ± 0.4%, and 234.0 ± 1.5 sec, respectively). Maximum VAP, MOT, and DSM were obtained in each solution containing 0.6 M NaCl (143.8 ± 1.0 µm/sec, 91.3 ± 2.0%, and 230.6 ± 4.2 sec, respectively), 0.6 M KCl (135.1 ± 3.1 µm/sec, 91.1 ± 3.1%, and 230.3 ± 3.7sec, respectively), 0.2M CaCl₂ (105.3 ± 4.7μm/sec, 47.9 ± 2.7%, and 120.7 ± 1.3 sec, respectively), 0.2 M MgCl₂ (107.3 ± 3.0 m/s, 42.1 ± 3.3%, and 120.3 ± 4.8 sec, respectively), and osmolality of 400 mOsm/kg (145.1 ± 2.5 µm/sec, 93.0 ± 2.1%, and 346.5 ± 4.4s, respectively). We used these mediums as artificial insemination media for fertilizing matured eggs. The results showed that the fertilization and hatching rates in 0.6 M NaCl (75.3 ± 0.6% and 57.0 ± 2.4%, respectively), ASW (70.8 ± 1.2% and 51.2 ± 1.8%, respectively), or 400 mOsm/kg (72.9 ± 1.8% and 55.3 ± 1.6%, respectively) were higher than that in seawater (63.9 ± 1.2% and 39.2 ± 3.9%, respectively). In conclusion, using 0.6 M NaCl, ASW, or 400 mOsm/kg as an artificial insemination medium is effective for fertilizing of waigieu seaperch.