Exploring the economic efficiency of trout farms: The dual impact of temperature and dissolved oxygen at high altitudes

IF 3.2 3区 农林科学 Q2 FISHERIES
Hiva Asadikia, Seyed Habibollah Mosavi, Tannaz Alizadeh Ashrafi, Michael R.Reed, Shraddha Hegde, Hamed Najafi Alamdarlo, Sadegh Khalilian
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Abstract

Rainbow trout (Oncorhynchus mykiss) are one of the most widely farmed fish species in aquaculture both globally and in Iran. While high-altitude trout farms benefit from colder temperatures favorable to trout farming, they also face challenges due to lower dissolved oxygen (DO) levels inherent to higher elevations. The overall impact of altitude on economic efficiency (EE) remains unclear. This study aims to fill this gap by analyzing the relationship between altitude and EE in trout farming, providing novel insights through the assessment of EE while exploring the effect of altitude in selected high-altitude aquaculture systems in Mazandaran, Iran. Using primary data collected from 25 trout farms in Mazandaran, we calculated EE scores through Data Envelopment Analysis (DEA) and assessed the impact of altitude using the Tobit model. Results indicate an average EE score of approximately 43%, despite subsidies supporting foreign trout egg imports. Findings from the Tobit model reveal that altitude negatively impacts EE, as the reduction in DO levels outweighs the benefits of cooler temperatures. These findings are specific to Mazandaran and may not apply to other regions. Our results suggest that genetic improvements alone (enhancing feed conversion ratios) are insufficient to improve EE in high-altitude farms in Mazandaran. Instead, reallocating subsidies from foreign trout eggs to investments in pressure swing adsorption (PSA) technology can significantly enhance EE by ensuring adequate DO levels. Implementing subsidized PSA equipment offers a practical and policy-relevant strategy to improve EE in high-altitude trout farms in Mazandaran. Future research should also incorporate additional confounding variables—such as broader genetic traits beyond feed conversion ratios (FCR), feed quality, and husbandry practices—to more comprehensively evaluate the drivers of economic efficiency.

Abstract Image

探索鳟鱼养殖场的经济效益:高海拔地区温度和溶解氧的双重影响
虹鳟(Oncorhynchus mykiss)是全球和伊朗水产养殖中最广泛养殖的鱼类之一。虽然高海拔鳟鱼养殖场受益于有利于鳟鱼养殖的较冷的温度,但由于高海拔固有的较低的溶解氧(DO)水平,他们也面临挑战。海拔对经济效率(EE)的总体影响尚不清楚。本研究旨在通过分析海拔与鳟鱼养殖中EE之间的关系来填补这一空白,通过评估EE提供新的见解,同时探索海拔对伊朗Mazandaran选定的高海拔水产养殖系统的影响。利用Mazandaran 25个鳟鱼养殖场的原始数据,通过数据包络分析(DEA)计算EE得分,并使用Tobit模型评估海拔的影响。结果表明,尽管有补贴支持进口国外鳟鱼卵,但平均EE得分约为43%。Tobit模型的研究结果表明,海拔高度对EE有负面影响,因为DO水平的降低超过了较低温度的好处。这些发现是Mazandaran特有的,可能不适用于其他地区。我们的研究结果表明,仅靠遗传改良(提高饲料系数)不足以改善马赞达兰高原农场的粗脂肪。相反,将外国鳟鱼卵的补贴重新分配给变压吸附(PSA)技术的投资,可以通过确保足够的DO水平显著提高EE。实施补贴的PSA设备为改善Mazandaran高海拔鳟鱼养殖场的EE提供了一项实用且与政策相关的策略。未来的研究还应纳入其他混杂变量,如饲料转化率(FCR)、饲料质量和饲养实践之外的更广泛的遗传性状,以更全面地评估经济效率的驱动因素。
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来源期刊
CiteScore
5.90
自引率
7.10%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of the World Aquaculture Society is an international scientific journal publishing original research on the culture of aquatic plants and animals including: Nutrition; Disease; Genetics and breeding; Physiology; Environmental quality; Culture systems engineering; Husbandry practices; Economics and marketing.
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