Tài liệu miễn phí Ngư nghiệp
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Đánh giá hiệu quả của vaccine bất hoạt phòng bệnh mù mắt do liên cầu khuẩn gây ra ở cá bớp nuôi tại Khánh Hòa
Nghiên cứu được tiến hành nhằm đánh giá hiệu quả bảo vệ cá bớp khỏi bệnh mù mắt do vi khuẩn Streptococcus iniae gây ra ở cá bớp của vaccine bất hoạt.
5/5/2020 12:48:09 AM +00:00
Dẫn liệu thành phần loài cá ở hồ Tân Giang, tỉnh Ninh Thuận
Bài viết cung cấp dẫn liệu bước đầu về thành phần loài, cấu trúc các bậc phân loại cá hồ Tân Giang, tỉnh Ninh Thuận. Kết quả nghiên cứu xác định được 16 loài thuộc 13 giống, 8 họ của 6 bộ.
5/5/2020 12:48:02 AM +00:00
Growth and survival in nursery rearing phase of the Asian seabass (Lates calcarifer, Bloch) under different stocking densities in floating net cages
This study was conducted to study the effect of stocking density on growth and survival of seabass, Lates calcarifer in floating net cages in closed bay, Bapatla, Andhra Pardesh, India. Triplicate groups of seabass with an average initial weight of 1.29±0.12 g were randomly stocked in floating net cages (1m×1m×2m) at 20, 40, 60 and 80 fish/m3designated as SD20, SD40, SD60 and SD80 respectively. Seabass in the cages were fed with 45% CP formulated diet at 10% of body weight twice daily. Sampling was done weekly.
5/5/2020 12:13:58 AM +00:00
Emerging animal protein source to replace fish meal in the diets of nile tilapia (Oreochromis niloticus) fry
A 60 days feeding trial was performed to assess the potential use of shrimp head meal (SHM) as complete replacement of fish meal (FM) in commercial diets of Nile tilapia (Oreochromis niloticus) fry.Quadruple groups were fed each of five isonitrogenous (40%) diets were formulated to contain graded levels of SHM at 0% (control diet, T1), 25% (T2), 50% (T3), 75% (T4) and 100% (T5), respectively.
5/5/2020 12:09:03 AM +00:00
Effect of microsporidian parasite Enterocytozoon hepatopenaei (EHP)on pond profitability in farmed pacific white leg shrimp Litopenaeus vannamei
In recent years, a number of diseases have been negatively effecting on shrimp aquaculture. More recently, Enterocytozoon hepatopenaei (EHP), a microsporidian parasite causes Hepatopancreatic Microsporidiosis (HPM) to be associated with white feces syndrome (WFS) and slow (retarded or stunted) growth in farmed L. vannamei (pacific white leg shrimp) in many of the shrimp growing countries in Asia, also in India. Numerous studies revealed that the pathogen causing significant economic losses to the shrimp industry. So, to evaluate the economical importance of this parasite on pond profitability, five (5) farm pond production effected by both EHP and white feces syndrome were compared with five (5) normally performed shrimp population with biosecured environment by adopting best management practices (BMPs).
5/5/2020 12:04:47 AM +00:00
Storage stability of artificial dry fish bait
Processing of seafood generates a huge quantity of wastes that are often diverted to fish meal production. Long line and trap fishing require live bait everyday to capture fishes. Small squids, sardines and trash fishes are generally used as live baits. Availability of live baits during all seasons and even the cost factor hinder the fishing quite often. As an alternative, development of “artificial dry bait” is gaining importance in recent years. In this study, artificial dry baits are prepared using tuna red meat discarded as waste by the tuna processing plant along with a suitable natural binder by single screw extrusion. The stability of the artificial bait in seawater was studied examine suitability as a bait.
5/5/2020 12:03:51 AM +00:00
Constraints faced by the fishery enterprises: A SWOC analysis
Fisheries enterprise plays an sustainable role in Indian agriculture not only generating high income in the rural areas, but also for earning their livelihood along with securing nutritional securities. Even fisheries play a significant role in food production sector, agricultural exports and involvement of large number of people for different activities in the sector.
5/5/2020 12:02:14 AM +00:00
Study of fish diversity in Vaitarna river of Wada taluka of Palghar district in Maharashtra, India
Study of biodiversity has become very essential for scientific data banking as unexpected abrupt climatic changes occurring regularly. This is mainly due to unchecked anthropogenic activities happening in the name of development. Riverine fishery is livelihood of many and also fish diversity of any region has great significance in environmental assessment of that region. The present research work was carried out to assess the fish diversity at Vaitarna River flowing in Wada Taluka region of Palghar district in Maharashtra. For the present study river water analysis of six villages and its fish diversity was accounted in context to the developments in the area such as industries, warehouses, etc.
5/4/2020 11:58:32 PM +00:00
First record of anophthalmic large scaled terapon, Terapon theraps Cuvier 1829 in trawl landings from versova, Mumbai, India
Anophthalmia is recorded for the first time in Terapont heraps. The specimen was caught by trawl net at Versova, northwest coast of India. Mature female Terapont heraps weighing 58.78 gm and 13.06 cm total length. Comparison of anophthalmic specimen with a normal specimen could not show significant variation in morphometric and meristic traits and the deformity may be congenital which has not affected growth and physiology of fish.
5/4/2020 11:56:38 PM +00:00
Antibacterial activity of fresh garlic juice against vibrio sp. Isolated from shrimp farm water: An in vitro study
Antibacterial activity of garlic was investigated on inhibition of Vibiro sp. isolated from shrimp farm water samples by well diffusion method. 100%, 50%, 25%, 10%, 5% of Fresh garlic juices were prepared from 100g garlic bulbs. Results indicated that the isolated Vibrio sp. showed different levels of sensitivity to different concentrations fresh garlic juice. The zone of inhibition of the bacterial growth increased with increasing concentration of fresh garlic juice. The results revealed that fresh garlic juice was effective against the test organism.
5/4/2020 11:50:10 PM +00:00
Decision-making and economics of adaptation to climate change in the fisheries and aquaculture sector
With increased international finance for climate change adaptation, and the emergence of national adaptation plans and adaptation projects, there is a greater focus on the economic appraisal of adaptation. Economic appraisal is standard practice in public-sector investment decisions in many countries, as well as in international development finance and overseas development assistance. It provides support to decision makers to help ensure the appropriate use of available resources, and to assess the options available for meeting objectives, by assessing costs, benefits and performance against other decision criteria. This publication reviews available information on the costs and benefits of climate change adaptation in the fisheries and aquaculture sector.
5/4/2020 11:48:12 PM +00:00
Aquafeed value chain analysis and a review of regulatory framework of striped catfish farming in Viet Nam
This study, and the publication of this document, was funded under the auspices of the project “FMM/BGI/ARI under Blue Growth Initiative (BGI) in Support of Food Nutrition Security, Poverty Alleviation and Healthy Oceans [FMM/GLO/112/MUL Baby 4 (Blue Growth)].
5/4/2020 11:48:06 PM +00:00
Studies and reviews 97: Allocated zones for aquaculture a guide for the establishment of coastal zones dedicated to aquaculture in the Mediterranean and the Black Sea
This guide is a collection of concepts and practical information aimed at facilitating the establishment of AZAs in the Mediterranean and the Black Sea. It provides detailed information on the process involved in the establishment of an AZA and it is intended as a practical and comprehensive tool to better understand site selection and planning for aquaculture.
5/4/2020 11:47:46 PM +00:00
The state of the world’s aquatic genetic resources for food and agriculture
The state of world aquaculture and fisheries; the use and exchange of aquatic genetic resources of farmed aquatic species and their wild relatives within national jurisdiction; drivers and trends in aquaculture: consequences for aquatic genetic resources within national jurisdiction; In situ conservation of farmed aquatic species and their wild relatives within national jurisdiction; ex situ conservation of aquatic genetic resources of farmed aquatic species and their wild relatives within national jurisdiction.
5/4/2020 11:46:30 PM +00:00
Nghiên cứu một số đặc điểm bệnh u nang bã đậu trong ruột cá chép do bào tử sợi gây ra tại Hải Dương
Hải Dương là một tỉnh có diện tích nuôi trồng thủy sản nước ngọt phát triển nhất ở các tỉnh phía Bắc, Việt Nam, trong đó cá chép là đối tượng được nuôi ngày càng nhiều. Tuy nhiên, trong những năm gần đây, dịch bệnh liên tục xảy ra trên đối tượng cá nuôi này, gây nhiều thiệt hại cho người nuôi, điển hình là bệnh u nang bã đậu ở ruột do bào tử sợi gây ra. Bài báo này cung cấp thông tin về đặc điểm bệnh học trên cơ sở điều tra 212 hộ nuôi cá với 257 ao nuôi tại 4 huyện trong tỉnh. Mẫu cá bệnh được thu thập, mổ khám và phân tích để xác định đặc điểm, triệu chứng bệnh, bệnh tích đại thể và vi thể bào nang.
5/4/2020 10:00:27 PM +00:00
Nghiên cứu bệnh đốm trắng ở cá cảnh biển
Nghiên cứu được thực hiện trên 15 loài cá cảnh biển phổ biến với số lượng mẫu là 211 con, được thu gom 3 đợt từ tự nhiên ở vùng biển Hạ Long, tỉnh Quảng Ninh; Nha Trang, tỉnh Khánh Hòa và được đưa về thủy cung Time City, Hà Nội trong giai đoạn từ tháng 2 đến tháng 10 năm 2016.
5/4/2020 9:58:20 PM +00:00
Khảo sát tỷ lệ nhiễm và phân tích gen SSU RRNA của vi bào tử trùng gây bệnh trên tôm nuôi nước lợ
Tổng số 238 mẫu tôm, trong đó có 52 mẫu tôm giống (post-larva) và 186 mẫu tôm thương phẩm đã được thu thập từ các ao nuôi tôm nghi mắc bệnh do vi bào tử trùng tại ba tỉnh Ninh Thuận, Kiên Giang và Bạc Liêu để sử dụng trong nghiên cứu này. Áp dụng phương pháp PCR với cặp mồi đặc hiệu EHP-510F/ EHP-510R để xác định tỷ lệ nhiễm vi bào tử trùng EHP từ số lượng mẫu nêu trên. Kết quả PCR cho thấy tỷ lệ tôm bị nhiễm bệnh ở 3 tỉnh Ninh Thuận, Kiên Giang và Bạc Liêu.
5/4/2020 9:56:27 PM +00:00
A study on soldier cap disorder in penaeus vannamei from culture ponds of Andhra Pradesh, India
Pacific white shrimp, Penaeus vannamei is the most extensively farmed crustacean species in the world as well India.In India, Andhra Pradesh state is occupying first place in culture production of vannamei shrimp. In recent years, P. vannamei faming in Andhra Pradesh is being encountered with multiple diseases such as running mortality syndrome (RMS), white spot syndrome virus (WSSV), white faeces/ white gut syndrome and severe retarded growth due a microsporedian, Enterocytozoon hepatopenaei (EHP) infection causing catastrophic influence on economy. Besides these diseases, cultured P. vannamei in Andhra Pradesh is being affected with soldier cap disorder with a clinical symptom of carapace folding out from the gill region at both sides, leading to moulting problem and poor growth rate in shrimp.
5/4/2020 9:35:40 PM +00:00
Prevalence of parasitic infestations in the freshwater fish, channa punctatus (Bloch) from Rajshahi Metropolitan, Bangladesh
Channa punctatus is one of the most delicious and demandable freshwater fishes of the country because of its high nutritional value, cheap cost and availability in the local markets. These fishes are often infected by parasites, which decrease the rate of growth as well as the reproduction rate of the host fishes, resulting in deteriorating the food value of fishes and economic loss to the culturists. Study of parasites is therefore an urgent necessity today. The prevalence of parasites in Channa punctatus was studied from different regions of Rajshahi Metropolis during July 2013 to April 2014. A total of 368 parasites were collected from the skin, gill, fin, intestine and stomach of 74 host species from 102 experimental fishes.
5/4/2020 9:34:22 PM +00:00
Fabrication and performance evaluation of improvised solar drier for preservation of fish
A study was carried out to compare the change in various quality parameters of Bombay duck (Harpadon nehereus) fish under conventional sun drying and improvised solar drying method using concentrating solar (CS) technology during storage at room temperature under aerobic packaging conditions in Sunderban area of West Bengal. The results of the current study revealed that there were no significant differences in the various quality parameters of dried fish samples in both the drying methods.
5/4/2020 9:18:39 PM +00:00
Observations on catch composition of conventional estuarine set bag nets (CESBN) Operated in Hoogly - Matlah Estuary, West Bengal, India
Preliminary studies on conventional estuarine set bag net (CESBN) were carried out during 2016-17 to know the current catch composition. The set bag net is locally fabricated fixed net, normally operated in estuarine region during winter season. The fishing trials were carried out in day time with soaking period of six hours excluding time of setting and hauling. Total of twenty cruises were made for the entire period of study. Results revealed that locally rigged set bag net with 20mm bar mesh size at cod end landed average catch composition of 23.15 kg/haul.
5/4/2020 9:18:33 PM +00:00
Histological alterations in the hepatopancreas and Growth Performance of pacific white shrimp (Litopenaeus vannamei, Boone 1931) reared in potassium fortified inland saline ground water
Study was conducted to determine the effect of potassium fortification on histological alterations of hepatopancreas and growth performance of pacific white shrimp, Litopenaeus vannamei, reared in different salinities of inland saline ground water (ISGW).
5/4/2020 9:17:02 PM +00:00
Induction of spontaneous captive spawning, embryonic development and larval rearing in Mystus cavasius
We report induction of spontaneous spawning in Mystus cavasius in glass aquaria provided with water hyacinth for egg attachment. The brooders (20 to 25g) were injected intramuscularly with Ovatide™ at the rate of 0.2 millilitre/Kilogram body weight and introduced into the spawning tanks in the evening. Maximum spawning response was obtained when two pairs of brooders were housed in one tank.
5/4/2020 6:34:38 PM +00:00
Enhancement of growth, immunity, resistance and survival of freshwater prawn, macrobrachium rosenbergii against white muscle disease (WMD) due to dietary administration of probiotic and biogut
The effect of oral administration of probiotic, biogut on growth, survival, and immuno response and disease resistance against white muscle disease was examined in freshwater prawn, M. rosenbergii. Biogut was administered to prawn through the diet at 1%, 1.5% and 2.0% body weight/day for a period of 90-day in recirculatary rearing system. The prawns were sampled on 90 day and challenged with white muscle disease virus, which is highly potential disease to prawn through injection route at 50 μl / juvenile.
5/4/2020 6:31:17 PM +00:00
Status of valuable components from pangasius: A review
Pangasius catfish is one of the world‟s fastest growing fresh water species in aquaculture. Different research findings have revealed development of various value added products from pangasius having global acceptance and commercial potential. The industry has expanded in terms of production and trade. Basa is being the preferred imported variety of Pangasius. It is now traded to well over 100 countries worldwide due to its mild flavor, whiter meat color and flaky cooked texture. The fish farmers practicing aquaculture have reported reduced profit margin.
5/4/2020 6:26:58 PM +00:00
Sử dụng domperidon và 17, 20 P kích thích cá trê vàng (Clarias macrocephalus Gunther, 1864)
Nghiên cứu này nhằm đánh giá ảnh hưởng của domperidon và 17, 20 P đối với sự thành thục và rụng trứng của cá trê vàng (Clarias macrocephalus Gunther, 1864).
5/4/2020 5:11:07 PM +00:00
Đánh giá khả năng bổ sung bột đậu nành trong nuôi tôm thẻ chân trắng theo quy trình Biofloc
Đề tài nghiên cứu nhằm mục tiêu đánh giá khả năng thay thế hoàn toàn hoặc một phần thức ăn cho tôm bằng bột đậu nành.Thử nghiệm được bố trí hoàn toàn ngẫu nhiên trong thời gian 63 ngày với bảy nghiệm thức và ba lần lặp lại. Tôm giống thả nuôi có trọng lượng ban đầu là 0,7±0,015 g/con trên bể composite 0,5 m3 với mật độ thả nuôi 150 con/m3.
5/4/2020 5:11:01 PM +00:00
Đánh giá yếu tố kỹ thuật và hiệu quả tài chính trong nuôi tôm thẻ chân trắng theo quy trình Biofloc tại Thạnh Phú, tỉnh Bến Tre
Nghiên cứu được thực hiện nhằm so sánh một số yếu tố kỹ thuật và hiệu quả tài chánh của mô hình nuôi tôm thẻ theo quy trình biofloc và nuôi theo quy trình truyền thống. Đề tài được thực hiện tại xã An Nhơn, huyện Thạnh Phú tỉnh Bến Tre, trên 6 ao nuôi với diện tích 0,3 ha/ao, trong đó ba ao nuôi theo quy trình biofloc và ba nuôi theo mô hình truyền thống (đối chứng, trong cùng một trang trại, và khảo sát 15 nông hộ nuôi tôm thẻ xung quanh).
5/4/2020 5:08:58 PM +00:00
Ảnh hưởng của thức ăn có hàm lượng đạm khác nhau lên tăng trưởng và tỷ lệ sống của cá trê vàng (Clarias macrocephalus) giai đoạn cá bột lên cá giống
Mục tiêu nghiên cứu nhằm xác định nhu cầu đạm trong thức ăn của cá Trê vàng (Clarias macrocephalus) giai đoạn cá bột lên cá giống. Nghiên cứu được thực hiện tại trại sản xuất giống thủy sản phường Phú Thứ, quận Cái Răng, thành phố Cần Thơ. Thí nghiệm được bố trí hoàn toàn ngẫu nhiên với 03 nghiệm thức, mỗi nghiệm thức được lặp lại 03 lần. Cá Trê vàng (18,1 mg) được ương trong thùng nhựa chứa 25 lít nước với mật độ 5 con/lít trong thời gian 10 tuần. Trong thí nghiệm này, ba loại thức ăn tương ứng với ba hàm lượng đạm (30%, 35% và 40%) được thí nghiệm nhằm đánh giá ảnh hưởng của thức ăn có hàm lượng đạm khác nhau lên tăng trưởng và tỷ lệ sống của cá Trê vàng.
5/4/2020 5:08:28 PM +00:00
Ảnh hưởng của độ mặn đến một số chỉ tiêu sinh lý và tăng trưởng cá rô đồng (Anabas testudineus)
Nghiên cứu được thực hiện nhằm xác định ảnh hưởng của độ mặn lên các chỉ tiêu sinh lý, sinh thái cá rô đồng (Anabas testudineus). Phương pháp truyền thống sử dụng bình kính nghiên cứu các chỉ tiêu sinh lý được sử dụng cho nghiên cứu này.
5/4/2020 5:06:02 PM +00:00