Aquaculture

Petuna Aquaculture is based entirely in Tasmania, across four locations. We breed our Petuna Atlantic Salmon & Petuna Ocean Trout from hand selected broodstock to give us healthy and premium Petuna Atlantic Salmon and Petuna Ocean Trout delivered nationally and internationally.

Our business is ‘vertically integrated’ with the following facilities in Tasmania:

Hatchery located at Cressy in the state’s North.
Marine grow-out area in Macquarie Harbour on the West Coast.
Marine grow-out area in the Tamar River in the Northern region.
Head office, factory processing and distribution facility in Devonport.

Aquaculture Cycle

  • Broodstock/Cressy

    Salmon and trout for breeding (broodstock) are maintained in flow-through systems supplied with high quality water from the Great Lake hydro scheme.

    Eggs from each female are kept separate and mixed with milt (sperm) from selected males and stripped every May and June.

  • Egg incubation/Cressy

    Eggs are maintained in a recirculation hatchery, where hatching times can be predicted and optimal temperatures met to reduce deformities and ensure high survival rates.

    Eggs are incubated for four weeks, before “eyed” eggs (where eyes become recognisable) are moved to hatching trays. Hatching begins after a further three weeks.

    The salmon, now known as fry, begin to swim and feed on yolk reserves, providing their nutritional requirements until first feeding begins about 21-28 days later.

  • Freshwater on-growing/Cressy

    On-growing of fry continues in a recirculation facility, where water quality, temperature control, biosecurity protocols and automated feeding systems are monitored.

    At between 5-10g fish are transferred into concrete tanks and earthen ponds until ready for the Macquarie Harbour or Tamar River marine sites when about 100g.

    Artificial lighting helps the fish make the transformation from the parr to smolt stage (a process known as smoltification – a series of physiological and morphological changes which enable the fish to thrive in a saltwater environment).

    Fish are vaccinated and assessed on their ability to transition into saltwater. They are hand graded to ensure only the highest quality are stocked into the marine sites.

    Fish are fed a specialised diet prior to, and for several weeks after, transfer to minimise stress and optimise saltwater acclimation and survival.

  • Transport to Macquarie Harbour / Rowella

    Fish are transferred to the marine sites in Petuna’s custom designed fish transport tankers, where water temperature and dissolved oxygen levels are monitored.

    Tankers reach the marine leases via a barge, with Macquarie Harbour water mixed into the tankers to ensure optimal acclimation to their new environment.

  • Our Catch

    Once our Ocean Trout and Atlantic Salmon are mature we catch and transport these to Devonport.

  • Devonport

    Our Ocean Trout and Atlantic Salmon are processed in Devonport and delivered to fish specialty stores in various formats.

PETUNA TASMANIAN ATLANTIC
SALMON LIFECYCLE

  • Eggs

    More

    Eggs

    Eggs are incubated and hatched under temperature controlled conditions to ensure the highest quality stock possible.

    Eggs
    Eggs Eggs
  • Alevin

    More

    Alevin

    After hatching, the fish absorb their yolk-sac reserves for nourishment.

    Alevin
    Alevin Alevin
  • Fry

    More

    Fry

    1 Month Old

    After the yolk reserves are absorbed, the fish begin to swim in search of food. At this stage they are moved to tanks and begin to feed.

    Fry
    Fry Fry
  • Parr

    More

    Parr

    12-18 Months Old

    When fish reach 5 – 10 grams, they are transferred to larger tanks and continue to grow for the next 12 months.

    Parr
    Parr Parr
  • Smolt

    More

    Smolt

    18-24 Months Old

    Fish make the transformation from the parr stage to smolt stage, enabling them to thrive in saltwater. Fish are then transferred to sea at around 100g.

    Smoult
    Smoult Smoult
  • Adult

    More

    Adult

    24-36 Months Old

    Fish spend 12 - 18 months at sea where they are fed high quality fish feed and their health and welfare are constantly monitored. They are harvested once they reach 4 - 6kgs.

    Harvest
    Harvest Harvest
  • Brood Stock

    More

    Brood Stock

    36 Months Old

    Milt and eggs are hand stripped from the best quality breeding stock and the eggs fertilised to restart the life cycle again.

    Brood Stock
    Brood Stock Brood Stock

Sustainability

Download sustainability report

Our Environmental Management Plan

The Environmental Management Plan (EMP) provides the framework for monitoring and improving the areas identified to have an impact on the environment.

The EMP was approved by the State Environmental Protection Authority and we are working towards preparing for third party certification to ISO14001 standard. We have also started implementing Best Aquaculture Practice standards, an international standard, and incorporating them into our EMP.

Fish By-product Generation and Recovery

By-products generated as part of the process activities in the Devonport factory are diverted away from the landfill disposal options that were traditionally the depository for by-products from seafood processing. The high quality organic by-products generated are converted into usable proteins like fish meal and oil, mixed with green waste to form compost and used as a protein and flavour concentrate for pet food.

Recycling

In addition to fish by-product, there are packaging wastes made up of cardboard, paper, soft plastics and polystyrene. Petuna segregates these packaging wastes into recyclable and non-recyclable materials. Diverting the recyclable component of this total packaging waste stream has resulted in a reduction of 25 tonnes a year of packaging waste going to landfill.

Packaging

Petuna is a signatory to, and supporter of, the Australian Packaging Covenant. The Covenant is the voluntary component of a co-regulatory arrangement for managing the environmental impacts of consumer packaging in Australia. It is an agreement, based on the principles of shared responsibility through product stewardship, between key stakeholders in the packaging supply chain and all spheres of government. The Covenant is designed to minimise the environmental impacts from the disposal of used packaging, conserve resources through better design and production processes and facilitate the re-use and recycling of used packaging materials.

Fish Feed

Petuna takes pride in producing the healthiest and best quality fish using high quality aquaculture feed

Feed is purchased from Skretting Australia and Ridley Aqua-feed who have dedicated feed plants and their products are manufactured in accordance with:

  • Full traceability requirements
  • ISO 9001 Quality Management System Standards
  • Audit Standard: AS/NZS ISO 9001:2008
  • HACCP certification (General principles of Food Hygiene)
  • FeedSafe certification (Stockfeed Milling Industry code of Good  Manufacturing Practice)

Our aim is to be a net fish producer, that is, we want to produce more fish per kilogram than we use in the production process. Feeds for farmed fish contain fishmeal and fish oil mainly as sources of protein and energy. As part of our commitment to the responsible use of the world’s resources and to address one of the key challenges facing the Salmon farming industry globally, we are working with our feed suppliers to reduce our fish oil and fish meal input and increase protein from other sources.

There have been a number of alternatives to fish oil and fishmeal identified from vegetable protein sources and land based animal products such as maize gluten, soybean and chicken meal (produced from the processing of chicken by-product). These protein sources are as good for the health, growth and quality of fish as any other protein and their use as a substitute for fish oil and fishmeal will continue to increase as we look to reduce our reliance on the finite natural wild caught resources