@inproceedings{fdi:010090892,
  title = {{N}utritional value and heavy metal content of farmed and candidate aquaculture seaweed species in {S}outh {A}frica [r{\'e}sum{\'e}]},
  author = {{D}arias, {M}aria {J}. and {M}acey, {B}.{M}. and {B}olton, {J}. and {H}enning, {S}. and {W}ieringa, {F}ranck and {B}erger, {J}acques and {O}pperman, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n {S}outh {A}frica, seaweed aquaculture is presently limited to {U}lva lacinulata and {G}racilaria gracilis, which are used as feed for farmed abalone ({H}aliotis midae) and, in the case of the former, also for water bioremediation in integrated aquaculture systems. {L}aminaria pallida, {E}cklonia maxima and {M}acrocystis pyrifera are additionally considered potential candidates for commercial kelp aquaculture. {T}he present study aimed at analysing the nutritional value and heavy metal content of these species to assess their beneficial value for human consumption and for animal feeds. {U}lva lacinulata and {G}. gracilis were sampled at an abalone farm and kelps were collected from natural stocks. {A}ll seaweeds contained similar levels of lipids (~3% dry matter-{DM}) and carbohydrates (~14% {DM}), while {U}. lacinulata and {G}. gracilis had a higher protein content (28% and 20% {DM}, respectively) than kelps (~14% {DM}). {B}oth farmed species also contained higher levels of polyunsaturated fatty acids, with ?-6 and ?-3 being highest in {U}. lacinulata and {G}. gracilis, respectively. {I}n terms of macrominerals, the highest levels of {C}a, {K} and {M}g were found in {U}. lacinulata, {M}. pyrifera and {G}. gracilis, respectively, while all kelps showed higher levels of {N}a and {P} than {U}. lacinulata and {G}. gracilis. {R}egarding trace elements, all seaweeds showed similar levels of {Z}n, while the farmed seaweed species contained higher {F}e, {S}e, {C}u, {M}n and {C}r levels than the kelps. {F}or heavy metals, {U}. lacinulata and {G}. gracilis accumulated higher {A}l and {P}b levels than kelps, whereas the opposite was found for {C}d, {H}g and {A}s. {L}aminaria pallida and {E}. maxima also contained the highest levels of {I}. {I}n conclusion, the studied seaweed species showed significant species-specific variations in their nutritional value and were particularly rich in minerals. {R}esults will be discussed in relation to {R}ecommended {N}utrient {I}ntake and known maximum limits for heavy metals},
  keywords = {{AFRIQUE} {DU} {SUD} ; {ATLANTIQUE} ; {OCEAN} {INDIEN}},
  numero = {},
  pages = {49},
  booktitle = {{A}fri{MAQUA} 2023 {C}onference : towards a more sustainable aquatic food system : interdisciplinary research on sustainable marine aquaculture in {A}frica : book of abstracts},
  year = {2023},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090892},
}