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The reproductive potential of the spider crab Maja brachydactyla (decapoda, majidae) under different salinity and photoperiod rearing conditions
|Autor:||Rotllant, Guiomar ; Simeó, Carles G.; Macià, Gloria; Estévez, Alicia|
|Fecha de publicación:||7-jun-2014|
|Editor:||World Aquaculture Society|
|Citación:||World Aquaculture Adelaide 2014 Create, Nurture, Grow. Abstracts: 629 (2014)|
|Resumen:||The spider crab Maja brachydactyla (Decapoda, Majidae) is the target of an intensive fishery in several areas of the NE Atlantic and some stocks show signs of overfishing. Hence, production of the spider crab in captivity might be a solution for the sector. Production and biochemical composition of newly hatched larvae in captivity of the spider crab Maja brachydactyla has been studied to assess the effect of salinity and photoperiod in the broodstock tanks. Broodstock animals were distributed in six 2,000-L tanks under constant temperature (18.5±1.0 ºC) and pH (8.0±0.1) with salinity and photoperiod being the variables tested. Two experiments were carried out using the different groups of broodstock. In the first experiment broodstock was kept under natural photoperiod conditions and two salinities: 34 ppt and 38 ppt. In the second experiment, we designed four treatments; we repeat the treatments of experiment 1 and we tested the combined effect of a fixed photoperiod (12 hours light/12 hours darkness: 12hL:12hD, corresponding to spring season) and compare the results with a group kept under natural variable photoperiod. Larval samples from every spawning of the broodstock groups were collected throughout the year and counted by volumetric method. Dry weight and protein, carbohydrate and lipid content were measured for each sample. For statistical purposes batches were grouped by season. The number of newly hatched larvae produced under a natural photoperiod was ten-fold higher than those produced using a fixed photoperiod at 34 ppt salinity during winter (Fig. 1). Dry weight of newly hatched larvae was significantly higher in treatments at 34 ppt compared to treatments at 38 ppt, whereas no effect of different photoperiods was observed (Fig. 2). No clear pattern of changes in larval protein, lipid and carbohydrate composition was observed under the environmental conditions tested. The results show that the salinity used for broodstock maintenance is an important factor causing changes in larval production of M. brachydactyla|
|Descripción:||World Aquaculture Adelaide, Create, Nurture, Grow, 7-11 June 2014, Adelaide, South Australia.-- 1 page, 1 figure|
|Versión del editor:||https://www.was.org/meetings/Default.aspx?code=WA2014|
|Aparece en las colecciones:||(ICM) Comunicaciones congresos|
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