Vertical distribution patterns of larval supply and spatfall of three species of Mytilidae in a Chilean fjord used for mussel farming: Insights for mussel spatfall efficiency
| Autor: | Doris Soto, Marcela Astorga, Carlos Molinet, Manuel Díaz, Karol Hueicha, Sandra L. Marín, Leny Cares, Thamara Matamala |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0303 health sciences
geography Mytilus chilensis geography.geographical_feature_category biology business.industry Fjord 04 agricultural and veterinary sciences Mussel Aquatic Science biology.organism_classification Fishery 03 medical and health sciences Water column Mytilidae Aquaculture Choromytilus chorus Aulacomya atra 040102 fisheries 0401 agriculture forestry and fisheries business 030304 developmental biology |
| Zdroj: | Aquaculture. 535:736341 |
| ISSN: | 0044-8486 |
| DOI: | 10.1016/j.aquaculture.2021.736341 |
| Popis: | The spatfall of mussels on artificial collectors sustains the production of ~350,000 t of mussels per year in Chile, which is known as “capture based aquaculture” (CBA), although little is known about the processes that determine a successful or unsuccessful spatfall. We studied the vertical variability of the larval supply and spat of Mytilus chilensis, Choromytilus chorus and Aulacomya atra in a marine farm located in one of the most important fjords used for spatfall in Chile. Larval supply was sampled five times per day (between 8 am and 6 pm) on three dates, in four depth strata between 0 and 13 m. Environmental variables from the water column were also recorded during each sampling. The spatfall was sampled monthly from December 2014 to June 2015 in the same four depth strata by installing 13 m long collectors in the study area. Larval supply of the three Mytilidae species showed few clear patterns, although the water column showed wide variability in temperature, dissolved oxygen, salinity, and sigma-t. The spatfall of M. chilensis and A. atra showed almost homogeneous vertical distribution at first. However, after six months, a stratified distributional pattern of spat emerged, with M. chilensis dominating between 0 and 7 m depth, and A. atra dominating between 7 and 13 m depth. In both species there was ~90% spat loss in six months from their maximum abundance, which needs to be studied. Our results suggest low production efficiency of spatfall in the study area and we concluded that improving the efficiency of spat collection and monitoring mussel spatfall is a priority, including their potential relationship with natural beds in the vicinity. |
| Databáze: | OpenAIRE |
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