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1.
Roy Endré Dahl Muhammad Yahya 《Aquaculture Economics & Management (Blackwell Science)》2019,23(3):321-340
AbstractIn this paper, a time-varying student-t copula is used to capture information on price volatility dependence in the short-, medium-, and long-run horizon in the US market for frozen and fresh salmon, trout, tilapia and catfish. Using monthly data from July 1992 to March 2017, the volatility dynamics for these aquaculture species are assessed. The analysis allows indicating significant differences in the volatility relationships, depending on time-frequency. While short-run volatility has limited dependency, there is significant dependency in both the medium- and long-run, indicating that market integration is stronger in the long-run. The information is particularly important to buyers and producers utilizing the futures markets, as contracts are typically traded using a set of frequencies, and may help them manage and reduce price risk. 相似文献
2.
Jie-Min Lee Tsorng C. Hwang 《Aquaculture Economics & Management (Blackwell Science)》2013,17(1):47-57
ABSTRACT Policy decisions on what aquaculture products to develop require information on consumer demand for cultured species. However, information on the structure of demand for aquaculture products is limited and what few studies there are in Taiwan, where aquaculture is a major industry, suffer from methodological problems. To clear up some of these problems, we used modified nonnested testing techniques and performance forecasting to determine which generalized models could best estimate the demand for Taiwanese aquaculture products. The results of modified nonnested testing of the aquaculture demand system showed that prices predetermined and quantities predetermined could be used to estimate demand. The generalized ordinary demand model was able to better forecast performance than the generalized inverse demand model. We used the likelihood ratio test to discriminate among the four competing models for the generalized ordinary model; the AIDS model could be more suitably applied to the data. A more general model that is able to incorporate different dynamic structures (partial adjustment, first autoregressive, and static). This general framework is applied to the AIDS model. The first autoregressive AIDS model we used to calculate the own and cross-price elasticities for milkfish, tilapia, shrimp, shellfish, and carps found that price elasticities varied across fish type, that some products had high long-run own price elasticities, and that the demand for aquaculture products was largely determined by inertia. 相似文献
3.
Esther Regnier 《Aquaculture Economics & Management (Blackwell Science)》2013,17(3):355-375
ABSTRACTAquaculture is contributing at an increasing rate to the world seafood supply. The interaction between fisheries and aquaculture is especially important for the seafood market where supply of wild and farmed fish can affect price dynamics. We examine market interactions in the French fresh sea bass and sea bream markets. We test for long-term price parity between farmed and wild products for these two species, applying a bivariate cointegration approach to market delineation. We also conduct the Law of One Price (LOP) test between price series. Our data base consists of monthly domestic price series for fish purchased by French households from 2007 to 2012. Our empirical results show that the fresh fish markets for whole wild and farmed sea bream are partially integrated, yet those for whole wild and farmed sea bass are not integrated. The substantially higher price for wild sea bass relative to farmed sea bass suggests that consumers may be more sensitive to seafood production processes when it comes to higher-value species. 相似文献
4.
《Journal Of Applied Aquaculture》2013,25(2):3-14
A mail survey was conducted in 1991 to identify barriers-to-entry into the Florida aquaculture industry. The survey was administered to all 586 individuals on the Florida Agricultural Statistics Service aquaculture industry participant mailing list. Two hundred twenty of the 227 returned questionnaires were complete. Of these, 175 respondents currently owned an aquaculture business; 141 reported producing only one species (defined in this study to be the general collection of species such as ornamental fish or aquatic plants rather than specific species within these groups), 29 reported producing two different species, and four reported producing three or more species. In order to analyze the data by species; only those aquaculturists producing single species were included in the final analyses. The survey results showed that economic factors (financial and marketing) presented the greatest barriers-to=entry into the Florida aquaculture industry, while regulatory barriers were relatively less problematic. Barriers were found to be highest for catfish culturists, followed by ornamental fish, bivalves, aquatic plants and alligators. 相似文献
5.
S. Benjamin Scuderi Xuan Chen 《Aquaculture Economics & Management (Blackwell Science)》2018,22(1):112-130
In 2003, the United States adopted anti-dumping tariffs for Vietnamese catfish products entering the country. This study examines how these tariffs have impacted the price relationship between domestically produced and imported catfish products. Cointegration tests confirm a long-run price relationship between domestic and imported catfish, which has persisted despite the anti-dumping tariffs. However, imports are composed of catfish from Vietnam and other countries, with only the former subjected to tariffs. Results from vector error correction models suggest that Vietnamese catfish prices do not significantly influence domestic prices. Conversely, the price of catfish from countries other than Vietnam continues to impact prices received by domestic catfish farmers and processors. The domestic catfish industry is still affected by lower-priced imports from countries other than Vietnam, although some of these may be transshipments that truly originate in Vietnam. This research methodology could be adapted to investigate trade and price interactions among other aquacultured species, which will become increasingly important as global aquaculture expands. 相似文献
6.
Rasmus Nielsen Max Nielsen Tenaw Gedefaw Abate Benni Winding Hansen Per Meyer Jepsen Søren Laurentius Nielsen Josianne Gatt Støttrup Kurt Buchmann 《Aquaculture Research》2017,48(6):2623-2641
This article analyses the challenges of different live‐feed regimes for the rearing of marine finfish larvae and discusses the potential alternative live feeds to avert a future live‐feed trap. Live feeds are indispensable for the successful rearing of larvae of most marine fish species. Brine shrimps (Artemia) and rotifers comprise the live feeds of choice in marine aquaculture today. However, their nutritional composition is deficient in especially essential fatty acids, and enrichment with fish oil is needed. Fish oil is considered a limited resource owing to its origin in fully exploited wild fish stocks. Moreover, fluctuations of the natural population of Artemia will, most likely, influence future availability and prices. This emphasizes the need for optimal exploitation of available live‐feed resources and development of new sustainable alternatives, such as copepods. An array of solutions to these problems are presented to avoid a future live‐feed trap and to reduce dependence on limited resources that influence future production possibilities, species diversification, price volatility and productivity in the aquaculture sector. 相似文献
7.
Peggy Schrobback Sean Pascoe Louisa Coglan 《Aquaculture Economics & Management (Blackwell Science)》2013,17(3):248-272
Economic competition between introduced and native aquaculture species is of interest for industry stakeholders since increased production can affect price formation if both aquaculture species are part of the same market or even substitutes. In this study, we focus on the Australian edible oyster industry, which is dominated by two major species—the native Sydney rock oyster (grown mainly in Queensland and New South Wales) and the non-native Pacific oyster (grown mainly in South Australia and Tasmania). We examine the integration of the Australian oyster market to determine if there exists a single or several markets. Short- and long-run own, cross-price and income flexibilities of demand are estimated for both species using an inverse demand system of equations. The results suggest that the markets for the two species are integrated. We found evidence that the development of the Pacific oyster industry has had an adverse impact on Sydney rock oyster prices. However, our results show that both species are not perfect substitutes. Demand for Sydney rock oysters is relatively inelastic in the long run, yet no long-run relationships can be identified for Pacific oysters, reflecting the developing nature of this sector. 相似文献
8.
Annabelle Oronti Andy J. Danylchuk Christina E. Elmore Rocco Auriemma Giusto Pesle 《Aquaculture International》2012,20(2):295-303
Sponge harvesting was a significant part of the Bahamian economy until the late 1930s when disease, hurricanes, and unsustainable
harvesting practices reduced the viability of the sponge industry. Current international demands for natural products, increasing
regional needs for economic diversification, and the historical foundation of sponging in The Bahamas makes sponge aquaculture
a desirable candidate as a sustainable industry. To determine the feasibility of sponge aquaculture in The Bahamas, we deployed
growout arrays between February 2006 and September 2009 at two sites off South Eleuthera to examine the survival and growth
rates of grass sponge (Spongia tubulifera) and hardhead sponge (Spongia pertusa) cuttings. Complete skin regeneration occurred for both species by the second week following deployment. Following 43 months
of growout, both grass and hardhead sponges showed significant positive growth, with cuttings of both species exhibiting faster
growth trajectories at the more protected site (Site A) when compared with the site further from shore (Site B). The proportion
of sponge cuttings lost during the course of the study was also considerably less for both species at Site A, as was the amount
of required maintenance for the arrays. The initial deployment of larger sponge cuttings could help reduce the overall growout
period, as would the selection of sites that offered more protection for growout. Based on these results, sponge aquaculture
could prove to be a sustainable low-cost industry in The Bahamas; however, further research on site selection, regulations,
and market acceptability remains to be done. 相似文献
9.
随着全球水产品养殖产量快速增长，水产养殖业在近二十年间正快速替代捕捞业，成为满足人类对优质蛋白需求极具潜力的生产活动。世界水产品消费量近几十年来快速增长，水产品在人类食物系统中具有越来越重要的地位。遗传改良作为发展水产养殖业的关键环节而备受关注，长期以来，以选择育种和杂交育种为主要的育种方法，以生长速度、成活率等经济性状为主要改良的目标性状，对世界水产养殖业的发展发挥了基础性、先导性和战略性作用。随着人们对优质蛋白需求的不断增加以及“大食物观”概念的广泛普及，将水产品打造为更加高效的食物生产系统是大势所趋。但纵观全球，水产养殖业存在遗传改良种类不多、覆盖面不广、改良性状滞后于产业发展需求等问题，需要加强水产育种技术创新和品种培育，培育更多的遗传改良种，推进水产养殖业高质量发展。本文基于已有研究结果，结合渔业各类统计数据，对世界水产养殖业发展概况、重要养殖种遗传改良情况、水产育种技术应用、目标性状改良以及部分主要人工改良种产量数据进行整理概述，总结发展状况，分析存在问题，以期为水产种业研究以及产业高质量发展提供参考。 相似文献
10.
11.
Frank Asche Marius Sikveland 《Aquaculture Economics & Management (Blackwell Science)》2015,19(3):301-315
It is well known that salmon aquaculture is a cyclical industry with substantial price volatility. However, limited attention has been given to the economic performance of the firms in the industry or their valuation. In this article we look closer at earnings before interest and tax (EBIT) in the Norwegian salmon farming industry. This is among the most common accounting measures of firm performance, and it is also used extensively in firm valuations. We find that the components of earnings have different time series behavior. Our empirical analysis shows that earnings from the Norwegian salmon farming industry can be characterized as a random walk. However, earnings/kg of fish sold is a more predictable variable and is mean reverting with clear cycles. 相似文献
12.
Pressure Induced Triploidy in Hybrid Lepomis 总被引：1，自引：0，他引：1
Paul S. Wills John M. Paret Robert J. Sheehan 《Journal of the World Aquaculture Society》1994,25(4):507-511
Worldwide expansion of aquaculture will require identification of species more adapted to localized conditions and less likely to affect genetic diversity of natural populations in the event of escape. Hybrids of Lepomis sunfish have the potential as an alternative for aquaculture in regions of North America where the growing season is unsuitable for production of traditional coldwater and warm-water species. Triploidy was induced in hybrids of green sunfish Lepomis cyanellus males and bluegill L. macrochirus females using hydrostatic pressure shocks. A total of 27 combinations of pressure (41,369, 48,264, and 55,158 kPa), duration (2, 3, 4 min), and post-fertilization time of shock initiation (2, 3, 4 min) were tested to identify those which were most efficient for inducing triploidy. Several of the shock regimes produced 100% triploid hybrid sunfish with at least 90% survival relative to unshocked controls. The two shock treatments deemed best overall were: 1) 48,264 kPa for 4 min begun 2 min after fertilization; and 2) 41,369 kPa for 2 min begun 3 min after fertilization. 相似文献
13.
Bashar Abul Heal Richard D. Hasan Neaz A. Salam Md. Abdus Haque Mohammad Mahfujul 《Fisheries Science》2022,88(6):767-786
Shrimp farming is fundamental to the national economy of Bangladesh, particularly through earning foreign currency. The nationwide lockdown and international cargo restriction jeopardized the sector and breaking its marketing chain. Assessing the degree of farming socio-economic peril from COVID-19 and suggesting early coping strategies and long-term mitigation measures are pressing to build resilience for this food production sector. To collect survey data, two key-informant face-to-face surveys with 51 shrimp farmers and 62 consumers in southwest Bangladesh were accomplished. As national lockdowns restricted access to export markets and movements within the country, farm incomes decreased against rising production costs. To compensate, farmers reduced their workforce (29.4%), but even with the sale of co-cultured finfish still suffered from large drops in revenue (42.8% average profit reduction). Furthermore, we present evidence that shrimp farmers should consider diversification of aquaculture product type as co-culture of additional shrimp species was a poor mitigation strategy against large market price fluctuations. Product price reductions were passed on to the consumer, who enjoyed falling product prices including more expensive shrimp products, but the markup for nearly all aquaculture products increased. The current jeopardy and consequences of shrimp farming future are discussed, including coping strategies to help policymakers in building resilience against future uncertainties.
相似文献14.
15.
This paper looks at price integration in the aquaculture and wild-harvested African catfish market channels in Uganda. The issue of integration between the two market channels is important because African catfish has become an important traded species in Uganda with exports to regional markets rising even faster than production, yet limited research has been undertaken to understand price formation in the supply chain. The analysis draws on monthly price data from January 2006 to August 2013, and applies threshold autoregressive approaches to test for the existence of a long-run relationship and price asymmetry and to determine the time path needed for shocks to be transmitted from one market channel to the other. The results show that, over the studied period prices in both market channels are linked in the long-run, implying that farm-raised catfish forms part of the same market as wild-harvested catfish in the country. The findings have strong implications for aquaculture producers and artisanal fishers as they can serve as a basis for more efficient farm management and marketing decisions. 相似文献
16.
Jonathan F. McKenzie 《Journal Of Applied Aquaculture》2013,25(4):205-214
The production and livelihood of aquaculture facilities depend on increased growth of species being harvested. Only 15%-25% of nitrogen and phosphorus are retained in farmed fish even when all feed is consumed. In both marine and freshwater aquaculture systems, bivalves have proven to be an inexpensive method for controlling algal growth through suspension feeding. With 25% of the native U.S. freshwater mussel species under federal protection, their use in aquaculture ponds could lead to further propagation and restoration of natural populations. Elliptio complanata is an important species in Delaware rivers and connected estuaries; a recent two-year study by the United States Geological Survey found that 98% of mussels found in the Delaware River were Elliptio complanata. The objective of this study was to calculate the clearance rate of E. complanata in a laboratory study. This would help us determine if mussels can serve as an addition to chemical and mechanical filtration regiments and thrive in an aquaculture setting. Using feeding chambers we investigated the effect of E. complanata on algae grown from an aquaculture pond and on a cultured alga over a four-hour period. Temperature, dissolved oxygen, and pH were monitored, and samples were than analyzed for total chlorophyll-α. The average of both the single cell using Chlorella vulgaris and mixed assemblage treatments chlorophyll-α clearance rate was 0.187 liters per hour per mussel. Prior to this experiment, these mussels were held for a period for two months in the holding system in the laboratory. The resulting low clearance rate as compared to the previous studies in the field is possibly due to the stress from holding these mussels. However, our study demonstrated that mussels have the potential to be used in an aquaculture setting and/or recreational ponds to help reduce algae populations that can occur as a result of eutrophication. 相似文献
17.
T. A. Borisova G. E. D'Souza D. Miller 《Aquaculture Economics & Management (Blackwell Science)》2013,17(1):73-98
Aquaculture industry development has been recognized to be an important step in improving a state's economy. However, local producers are facing significant competition from international, national, and other state producers. In this paper, the focus is on competition among local producers. The objective is to examine how interactions among industry participants determine prices and profitability of individual fish growers. The application involves the trout sector of the West Virginia aquaculture industry. Using a game theoretic framework, the Bertrand oligopoly model, and a combination of data from primary and secondary sources, price competition among producers is modeled under different supply and demand scenarios. Factors such as production volume and cost, location relative to market outlets, supply dependability, and proximity to other competitors and markets influence the profitability and competitive position of individual producers. Results also show that, as expected, the entrance of new growers results in a reduction of the sales price, and creates more favorable conditions for sales outlets. In contrast, the appearance of new sales outlets results in an expected increase in sales prices and producers' profits. Implications are derived for the West Virginia aquaculture industry and for other areas where an abundant natural resource base combined with a rapidly growing aquaculture industry are linked to a growing competition for markets and, hence, producer profitability and survival. 相似文献
18.
鲆鲽类苗种技术创新与推广对策——基于生产者技术需求调研的思考 总被引：1，自引：0，他引：1
苗种是水产养殖生产的基础资料,苗种科技创新与推广的有效程度直接影响到产业可持续发展。以作为我国海水鱼类代表的鲆鲽类养殖业为例,基于养殖生产者的技术需求调研结果,提出了该产业苗种技术创新与推广的策略,即以市场为导向,始终将苗种科技创新作为重要的产业发展战略;密切结合产业发展转型战略,有效对接产业差别化需求,有差别地重点推进快速生长苗种、强抗逆性苗种以及全雌化优质苗种的培育与推广;因地制宜推进特色品种苗种培育,为塑造区域性鲆鲽类产品品牌提供支撑;认真做好战略储备性品种的苗种培育,切实推进产业的梯度发展;密切关注我国近海渔业资源修复之需求,培育适于增殖放流的鲆鲽类苗种。 相似文献
19.