Site FW:DW DM OM CP TL Carbohydrates Ash GE (MJ.kg-1 DM) MARFUA MARFU GFBB Kelso 6.31 4.37 11.98 940.87 937.93 926.84 841.11 935.90 832.35 278.56 252.40 75.41 96.76 79.35 52.09 406.66 542.08 631.69 158.89 64.10 167.65 16.08 19.41 15.18 Green algae Caulerpa taxifolia Chaetomorpha linum Cladophora coelothrix Cladophora patentiramea Derbesia tenuissima Ulva sp. Ulva ohnoi MARFU MARFU GFBB Bowen PRC MARFU MARFU MARFU 11.11 6.00 3.72 4.45 8.10 6.90 6.52 930.81 934.81 923.57 938.31 919.27 911.42 907.00 730.39 745.56 765.90 635.04 922.52 793.49 788.74 166.73 218.54 269.33 122.61 339.09 241.62 220.59 58.98 47.89 49.96 26.07 130.13 33.05 24.56 435.49 413.94 370.18 424.67 372.55 430.23 450.59 269.61 254.44 234.10 364.96 77.48 206.51 211.26 13.07 12.86 15.32 11.22 20.14 13.57 12.02 Brown algae Cystoseira trinodis Dictyota bartayresii Hormophysa triquetra Padina australis Sargassum flavicans Colpomenia sinuosa NBD NB and RBE NB RB NB NB 6.39 6.74 5.73 5.38 6.80 15.63 919.95 945.44 925.32 933.88 925.19 945.06 733.33 699.27 696.93 614.43 744.19 590.31 98.45 96.30 42.50 59.18 45.19 75.86 35.22 112.82 33.94 24.98 27.21 31.05 524.18 440.06 547.78 466.90 599.08 431.99 266.67 300.73 303.07 385.57 255.81 409.69 12.09 12.86 10.68 8.65 11.67 9.86 Red algae Asparagopsis taxiformis Halymenia floresii Hypnea pannosa Laurencia filiformis MARFU NB NB NB 3.73 7.88 10.40 11.70 944.82 929.30 935.74 936.57 810.58 722.50 526.65 640.21 254.75 99.60 65.64 86.75 33.33 15.14 28.51 64.32 437.35 525.34 360.52 415.50 189.42 277.50 473.35 359.79 16.44 11.55 7.54 11.46 DCS Flinders grass - - 897.91 925.92 801.01 875.76 497.50 27.50 47.18 28.68 154.24 745.51 198.99 124.24 18.55 15.51 Species Freshwater algae Cladophora vagabunda Oedogonium sp. Spirogyra sp. 1 2 3 4 5 6 A Marine and Aquaculture Research Facility Unit, Macroalgal Biofuels and Bioproducts Research Group, James Cook University (19.33oS; 146.76oE); B Good Fortune Bay Fisheries, a barramundi farm (19.36oS; 146.70oE); C Pacific Reef Fisheries, Tiger prawn farm (19.58°S, 147.40°E); D Nelly Bay, an intertidal reef flat situated in Magnetic Island (19.16°S; 146.85°E), E Rowes Bay, an intertidal reef flat situated in Townsville (19.23°S, 146.79°E). Parameters were calculated in g.kg-1 DM, unless otherwise stated; FW:DW, fresh weight to dry weight ratio; DM, dry matter; OM, organic matter; CP, crude protein (nitrogen factors of 5.13, 5.38, and 4.59 for green, brown and red macroalgae, respectively [25], and 6.25 for cottonseed and Flinders grass hay); TL, total lipids; GE, gross energy; (n = 2 ).