面对大西洋鲭鱼过度捕捞危机，英国主要食品品牌正在改变产品配方。Princes和Lidl等罐头鱼品牌已将传统大西洋真鲭鱼替换为杰克鲭鱼，尽管产品标签清晰标注了这一变化，但专家和消费者质疑这构成了一种欺骗性的"缩水通胀"1。
营养价值的显著差异成为消费者关注的焦点。杰克鲭鱼的欧米伽-3含量仅为大西洋真鲭鱼的约一半1，而美食评测者Marcus Ansell对原产鲭鱼的评分为8分满分，杰克鲭鱼仅得3.5分1。尽管如此，这种替代品以相似的价格销售。根据成本数据，智利产杰克鲭鱼的成本约为大西洋真鲭鱼的三分之一1。消费者组织Which?将这一现象列为"缩水通胀"的典型案例1。
环保压力正推动零售行业做出调整。海洋管理委员会（MSC）已将东北大西洋鲭鱼评为"红色"等级，建议消费者避免购买1。去年，英国环保部门修改标签规则，允许杰克鲭鱼以该名义在市场销售1。面对这一压力，Waitrose超市今年因过度捕捞问题暂停了鲭鱼销售1。
UK canned fish brands including Princes and Lidl have begun replacing Atlantic mackerel with jack mackerel in their tinned products, responding to overfishing pressures on traditional mackerel stocks 1. Although the substitution is clearly labeled on packaging, consumer advocates and experts argue the swap constitutes a form of "shrinkflation," as jack mackerel contains roughly half the omega-3 content of Atlantic mackerel while commanding similar retail prices 1. Food critic Marcus Ansell rated traditional mackerel 8 out of 10, while assigning jack mackerel only 3.5 out of 10, highlighting the perceived quality gap 1.
The Marine Stewardship Council has designated northeast Atlantic mackerel as "red" status—fish to be avoided—due to overharvesting concerns 1. Jack mackerel, sourced primarily from Chile, costs approximately one-third as much as Atlantic mackerel, making it economically attractive to manufacturers despite its inferior nutritional profile 1. The UK's environmental authority modified labeling regulations last year to permit the species to be marketed as "jack mackerel" 1. Waitrose temporarily suspended mackerel sales this year as part of its response to unsustainable fishing practices 1. Consumer organization Which? has identified the product substitution as another example of shrinkflation affecting British households 1.
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