Detectives executed a search warrant at a property in Heathcote on April 7, with assistance from the North West Metro Regional Crime Squad and Water Police Squad.
Officers located two boats and trailers, with a total value of more than $240,000.
With assistance from the Shepparton Divisional Response Unit, a further search warrant was executed at a property in Murchison on April 26.
A man, 52, was arrested.
Detectives seized a large amount of allegedly stolen property and drugs including 115kg of dried cannabis with an estimated street value of $1.5 million.
Two firearms, a stolen truck, bobcat, two motorcycles and an industrial generator were also seized.
The Murchison man was charged with trafficking a commercial quantity of a drug of dependence (cannabis), four counts of handle stolen goods, possess drug of dependence (crystal methylamphetamine), possess category A longarm unlicensed and possess imitation firearm.
He appeared before the Shepparton Magistrates’ Court on April 27 and was remanded to re-appear on July 19.
Detectives subsequently executed a search warrant the Melbourne suburb of South Kingsville on May 2.
They found vessel registration stickers, drugs, a samurai sword and allegedly stolen computers and phones.
A South Kingsville man, 53, was interviewed by detectives and released pending summons and is expected to be charged with a number of drug and theft offences.
Police said the investigation remains ongoing and further arrests are expected.
“What started out as one stolen boat led to police dismantling what we will allege was an organised crime network,” Water Police Inspector Greg Barras said.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppervic.com.au