Identifying mussels Adult shells vary in size from about 50 to 200 mm in length but most shells fit snugly in the palm of your hand. The shell colour of mussels ranges from brown to black, although it can be green in young shells. In this section keyboard_arrow_down Topics Heritage keyboard_arrow_down Expand Heritage menu About heritage Request a heritage listing Manage heritage items Search heritage databases Apply for heritage approvals and permits Heritage grants Celebrate heritage Aboriginal Cultural Heritage Advisory Committee Heritage Council of NSW Animals and plants keyboard_arrow_down Expand Animals and plants menu Biodiversity conservation framework Biodiversity Offsets Scheme keyboard_arrow_down Expand Biodiversity Offsets Scheme menu About the Biodiversity Offsets Scheme keyboard_arrow_down Expand About the Biodiversity Offsets Scheme menu Biodiversity Offsets Scheme overview and achievements How the Biodiversity Offsets Scheme works keyboard_arrow_down Expand How the Biodiversity Offsets Scheme works menu Biodiversity credits Biodiversity Stewardship Agreements Biodiversity offsetting The Biodiversity Assessment Method keyboard_arrow_down Expand The Biodiversity Assessment Method menu Applying the Biodiversity Assessment Method keyboard_arrow_down Expand Applying the Biodiversity Assessment Method menu Types of Biodiversity Assessment Reports NSW Government administration of the scheme About the Biodiversity Credits Supply Fund keyboard_arrow_down Expand About the Biodiversity Credits Supply Fund menu Supply Fund and Credit purchasing Current biodiversity credit demand Biodiversity Credits Catalogue keyboard_arrow_down Expand Biodiversity Credits Catalogue menu Advertise in the Biodiversity Credits Catalogue Credit Demand Expression of Interest Nature Markets and Offsets BioBanking: the previous scheme keyboard_arrow_down Expand BioBanking: the previous scheme menu BioBanking Agreements and credits Assessment of reasonable credit equivalence keyboard_arrow_down Expand Assessment of reasonable credit equivalence menu Apply for an equivalence assessment for existing BioBanking credits Apply for an equivalence assessment for BioBanking credit obligations BioBanking transitional arrangements keyboard_arrow_down Expand BioBanking transitional arrangements menu Clause 34A certification Generate credits with a biodiversity stewardship agreement keyboard_arrow_down Expand Generate credits with a biodiversity stewardship agreement menu Generate and sell biodiversity credits keyboard_arrow_down Expand Generate and sell biodiversity credits menu