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Home / New Zealand

Former Southland fisherman fined $50,000 for illegally selling seaweed fertiliser online

NZ Herald
1 Oct, 2025 03:57 AM2 mins to read

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Ryan Campbell McManaway, 36, was illegally selling seaweed fertiliser.

Ryan Campbell McManaway, 36, was illegally selling seaweed fertiliser.

A former fisherman has been fined $50,000 for illegally selling seaweed fertiliser.

Ryan Campbell McManaway, 36, was sentenced at the Invercargill District Court on September 26 on four charges under the Fisheries Act - illegally selling seaweed and three charges of failing to comply with a directive to attend an interview with a fishery officer.

He was fined $50,000 for illegally selling seaweed and $3,000 for the remaining 3 charges.

McManaway was absent for the sentencing.

In November 2022, Ministry for Primary Industries (MPI) fishery officers discovered an online post advertising liquid seaweed fertiliser in 1,000L containers for $500 or $20 for a 20L bucket.

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A search warrant of a property found 14 of these containers of liquid seaweed fertiliser. Analysis of the seaweed found it to be macrocystis pyrifera, which can be used for fertiliser and in some food products.

During their investigation, officers also found an industrial mincer with six implements that had seaweed on them, along with various other pieces of seaweed at the property.

Fisheries NZ southern regional manager Garreth Jay said McManaway was not a commercial fisher at the time and had no legitimate right to harvest and sell this seaweed as a fertiliser.

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“Mr McManaway could’ve potentially earned several thousand dollars from this illegal operation,” he said.

“When we find evidence of people breaking the rules that are there to protect the sustainability of our fisheries resources and the livelihood of legitimate commercial operators, we will hold them to account.”

MPI encourages people reporting any suspicious fishing to 0800 4 POACHER (0800 47 62 24) or poacher@mpi.govt.nz.

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