New Zealand seafood giant Sanford is warning investors that the second half of 2021 may be more challenging than anticipated as the company experiences a patchy recovery from the effects of the global COVID-19 pandemic.

In normal times, Sanford would typically expect to see a seasonal uplift in its second half performance, but these are not normal times.

Like many other seafood companies, it has been battered by higher supply chain costs and the shortage of shipping containers.

“As a heavily export focused business, we were hit early by the impact of Covid-19 globally on food service and supply chains," said Sanford CEO Peter Reidie.