Please cite this article as: Brundu, Gianni, Monleón, Lorena Vian, Vallainc, Dario, Carboni, Stefano, Effects of larval diet and metamorphosis cue on survival and growth of sea urchin post-larvae (Paracentrotus lividus; Lamarck, 1816), Aquaculture (2016Aquaculture ( ), doi: 10.1016Aquaculture ( /j.aquaculture.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Although all dietary treatments resulted in a good survival at competence, significant difference in post-larval survival was observed between treatments, and indeed, only larvae fed Duna and CD survived to 180 days post settlement (DPS).In the second experiment, the settlement substrates consisted in a film of cultured Ulvella lens or a naturally developing biofilm of diatoms, and the employed rearing water was either natural seawater or seawater previously exposed to P. lividus adults. At 10 DPS, larger (p<0.05) post-larvae were observed in the natural biofilm treatment, whilst the presence of conspecifics significantly increased larval settlement in both substrates (p<0.01).These results indicate that it is important to consider the survival of post-larvae and juveniles to establish the efficiency of the dietary treatment on the hatchery production of P. lividus. Furthermore, it suggests that improved settlement protocols, such as the use of conspecifics, could contribute to increase hatchery outputs. Finally, it confirms the suitability of U. lens as settlement cue but also highlights that further research is required to establish its effectiveness for post-larvae first feeding.
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Chemistry and Ecology on 2017, available online at: http://www.tandfonline.com/10.1080/02757540.2017.1378351Current aquaculture practices have a detrimental impact on the environment, in particular due to the release of high concentration of nitrogen and phosphorus that can induce eutrophication. This study investigates and compares the capacity of three microalgae species Tetraselmis suecica, Isochrysis galbana and Dunaliella tertiolecta, in the bioremediation of grey mullet Mugil cephalus wastewater. The experiment was conducted in batch conditions for 7 days using completely mixed bubble column photobioreactors. After two days, T. suecica and D. tertiolecta were able to remove more than 90% of dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorous (DIP), whereas I. galbana removed only 32% and 79% of DIN and DIP, respectively. A higher biomass yield resulted for T. suecica (603¿±¿34 mg/L, mean¿±¿SE). This study confirms the potential to employ T. suecica in an Integrated Multi-Trophic Aquaculture system for bioremediation of wastewater and identifies D. tertiolecta as another valid candidate species. Moreover, these species can growth in unsterilized culture media, and this reduces energy consumption, costs and efforts.Peer ReviewedPostprint (author's final draft
Within the fish taxon Mugiliformes, the larval development of Mugil cephalus has been studied most intensively, because it has the widest range of distribution among all mugilids and is of interest to aquaculture all over the world. Although numerous studies have dealt with larval rearing, growth and development, the osteological development of M. cephalus and mugiliforms in general has largely been neglected. Herein, we describe the skeletal development of mullets for the first time. Cleared and double-stained specimens of aquaculture-reared M. cephalus and wild-caught mugilid larvae were examined to describe the early development of the pectoral and pelvic girdle, the vertebral column and the caudal and median fins. The description of four embryonic and six larval developmental steps within the embryonic and larval period enables us to compare larval sizes of reared and wild-caught larvae. Ontogenetic fusions of ural centra 1 and 2 into a compound centrum, in addition to the fusion of two pterygiophores in the anal fin, have implications for the perception of the adult morphology. Moreover, comparison of mugilid development with that of other ovalentarian taxa shows that recent phylogenetic hypotheses need further morphological investigation.
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