Improved upper thermal tolerance in rainbow trout

提高虹鳟鱼的上部耐热性

• 批准号: 506290-2017
• 负责人: Danzmann, Roy
• 金额: $ 11.73万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=642134
• 关键词: Improved; upper; thermal; tolerance; rainbow

Aquaculture is recognized as a growing source of employment and offers the possibility for social and economic improvements in communities with limited industrial alternatives. Ontario is the major Canadian producer of rainbow trout for human consumption. Young trout (called seedstock) are produced from adult breeders (broodstock) and reared for several months in land-based hatcheries. They are then transported to cages in Georgian Bay and the North Channel of Lake Huron where they are grown over the summer and harvested. Even though market demand and consumer acceptability for Ontario trout is very strong, imports of farmed fish products dominate the marketplace. The major producer of seedstock in Ontario (Lyndon Fish Hatcheries Inc., New Dundee, Ontario) is unable to meet the demand for seedstock to be grown in cages. The development of Canadian trout aquaculture is limited by the ever increasing summer temperatures that the fish are being exposed to in the cages. Increased water temperatures lead to stress and as a result the fish do not feed and grow for four weeks or more - fillet yield can be reduced by up to 25%. Our proposed research will use two inter-related strategies expedite the development and availability of rainbow trout that are suited to culture at higher water temperatures. First, we will identify genetic markers that are associated with increased tolerance to thermal stress. This will facilitate the genetic improvement of the Lyndon rainbow trout broodstock and thus increase productivity of the Ontario industry. Second, we will explore a novel approach where young fish are pre-conditioned to mild thermal stress and test whether they are able to resist stress when they are older. This project involves groups from two Canadian universities and two supporting organizations. This concerted effort is an example of an advanced biotechnology being applied to enhance the capability of one of Canada's resource based industries, namely aquaculture.

水产养殖被认为是一个不断增长的就业来源，并为工业替代品有限的社区提供了社会和经济改善的可能性。安大略省是加拿大供人类消费的虹鳟鱼的主要生产地。幼鳟鱼（称为苗种）是由成年繁殖体（亲鱼）生产出来的，并在陆上孵化场培育数月。然后，它们被运送到乔治亚湾和休伦湖北部的网箱中，在那里在夏季生长并收获。尽管安大略鳟鱼的市场需求和消费者接受度非常强劲，但进口养殖鱼产品在市场上占据主导地位。安大略省主要苗种生产商（安大略省新邓迪的 Lyndon Fish Hatcheries Inc.）无法满足网箱养殖苗种的需求。加拿大鳟鱼水产养殖的发展受到夏季气温不断升高的限制，鱼在网箱中所面临的温度不断升高。水温升高会导致压力，导致鱼在四个星期或更长时间内无法进食和生长 - 鱼片产量最多可减少 25%。我们提出的研究将使用两种相互关联的策略来加快适合在较高水温下养殖的虹鳟鱼的开发和可用性。首先，我们将确定与增加热应激耐受性相关的遗传标记。这将促进林登虹鳟亲鱼的遗传改良，从而提高安大略省产业的生产力。其次，我们将探索一种新方法，让幼鱼预先适应温和的热应激，并测试它们在长大后是否能够抵抗压力。该项目涉及来自两所加拿大大学的小组和两个支持组织。这一共同努力是应用先进生物技术来增强加拿大资源型产业之一（即水产养殖）能力的一个例子。