THE HARBOUR SCHOOL SYDNEY
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    • Operation Crayweed
    • Operation Posidonia & Seeds of the Sea
    • IMOS
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    • Geographical Investigation, Skills & Fieldwork
    • Sydney Estuary
    • Gamay (Botany Bay)
    • Mangrove Forests
    • Kelp - Great Southern Reef
    • Oyster Reefs
    • Darling Harbour Precinct
    • Snorkelling
    • Coral Reefs
    • Tundra
    • Geographical Tools
  • Projects
    • Living Seawalls School Hub
    • Blue Schools Network
    • STEAM
      • Investigating Middle Harbour Creek
      • Eco-Engineering
    • Ocean Art
  • Professional Learning
  • Home
    • About Us
    • Staff
    • Cancellations & Changes
    • Past Events
    • Blog
    • Contact Us
  • Excursions
    • INCURSIONS
    • Living Seawalls - Growth and Survival of Living Things
    • Living Seawalls - Marine and Civil Engineering
    • Living Seawalls - HPGE STEAM Program
    • Kelp Forests
    • Darling Harbour Precinct
    • Earth's Environments
    • Environmental Change
    • Geographical Investigation
    • Iron Cove
    • Life In The Sea
    • Estuarine Studies
    • Oceanography
  • Resources
    • Living Seawalls
    • Reef Design Lab
    • Operation Crayweed
    • Operation Posidonia & Seeds of the Sea
    • IMOS
    • Project Restore
    • Geographical Investigation, Skills & Fieldwork
    • Sydney Estuary
    • Gamay (Botany Bay)
    • Mangrove Forests
    • Kelp - Great Southern Reef
    • Oyster Reefs
    • Darling Harbour Precinct
    • Snorkelling
    • Coral Reefs
    • Tundra
    • Geographical Tools
  • Projects
    • Living Seawalls School Hub
    • Blue Schools Network
    • STEAM
      • Investigating Middle Harbour Creek
      • Eco-Engineering
    • Ocean Art
  • Professional Learning

The Harbour School Sydney

Operation Crayweed

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Operation Crayweed Comic
Crayweed is an important species that promotes biodiversity and provides shelter, habitat and food for many aquatic species. Abalone and crayfish are examples of species reliant on Crayweed. 

Over time Sydney’s Crayweed was impacted by poor water quality and pollution. As the harbour has become cleaner, efforts to restore Crayweed forests are experiencing success. 

Operation Crayweed is an ecosystem restoration project to reforest by planting reproductive Crayweed in temporary mats affixed to rocks. These reproductive Crayweed produce “craybies” - Crayweed babies.

Download the Operation Crayweed cartoon.


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Visit the Operation Crayweed website

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Operation Crayweed Glossary

Crayweed
Crabies
Transplantation
Storm Squad
Citizen science

Download the Operation Crayweed Glossary


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Operation Crayweed - Crayfish Maze

Download the Operation Crayweed Crayfish Maze

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Operation Crayweed Find-a-word

Download the Operation Crayweed Find-a-word

External resources

Watch the video: Underwater Forest Restoration in Sydney.

Podcasts
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Seaweed People
02: Reforesting seagrasses and crayweed with Adriana Verges

Access podcast

Excursion

Are you interested in an excursion to learn about Operation Crayweed?

Consider:
Stage 6 Geography - Kelp Forests
Kelp Forests

Incursions

Incursions about Kelp Forests and the Great Southern Reef are available for:
​Stage 2 - HSIE and Science
Stage 5 Marine and Aquaculture Elective
Stage 5&6 Geography
GSR Incursions
The Harbour School Sydney Pty Ltd
ACN 668 200 815
We acknowledge Aboriginal and Torres Strait Islander people and recognise their continuing connection with, and knowledge about, land, waters and community. We pay our respects to them and their cultures; and to Elders past, present and emerging.

Email: [email protected]
​Mobile: 0414398721
Office: 9716 0986
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© 2025, The Harbour School Sydney Pty Ltd
  • Home
    • About Us
    • Staff
    • Cancellations & Changes
    • Past Events
    • Blog
    • Contact Us
  • Excursions
    • INCURSIONS
    • Living Seawalls - Growth and Survival of Living Things
    • Living Seawalls - Marine and Civil Engineering
    • Living Seawalls - HPGE STEAM Program
    • Kelp Forests
    • Darling Harbour Precinct
    • Earth's Environments
    • Environmental Change
    • Geographical Investigation
    • Iron Cove
    • Life In The Sea
    • Estuarine Studies
    • Oceanography
  • Resources
    • Living Seawalls
    • Reef Design Lab
    • Operation Crayweed
    • Operation Posidonia & Seeds of the Sea
    • IMOS
    • Project Restore
    • Geographical Investigation, Skills & Fieldwork
    • Sydney Estuary
    • Gamay (Botany Bay)
    • Mangrove Forests
    • Kelp - Great Southern Reef
    • Oyster Reefs
    • Darling Harbour Precinct
    • Snorkelling
    • Coral Reefs
    • Tundra
    • Geographical Tools
  • Projects
    • Living Seawalls School Hub
    • Blue Schools Network
    • STEAM
      • Investigating Middle Harbour Creek
      • Eco-Engineering
    • Ocean Art
  • Professional Learning