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The influence of techniques of larvae rearing and seed collectors on the survival rate and recovery efficiency of the brown mussel Perna perna (L.) in laboratory BABT
Beduschi,Pedro; Melo,Cláudio Manoel Rodrigues de; Ferreira,Jaime Fernando.
Te study compared the hatchery recovery efficiency and survival rate of Perna perna spats using larvae submitted to four conditions, prior to settlement, tested with for different collectors. In 15 days old larvae (eyed larvae, T1), transparent nylon thread collectors presented the best results for spats recovered per meter of collector. The 28 days old larvae (foot larvae) stored under refrigeration before settlement (T3 with water and T4 without water) showed no significant differences between the spat number in all the collectors. The brown multi-thread collector was more efficient in T 4. The blue polyamide thread collector was the most efficient with 28 days old larvae settled directly, without refrigeration (T2). Treatment 1 showed the highest spats...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spats; Settlement; Perna perna; Collectors; Hatchery.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100019
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Periphyton biomass on artificial substrates during the summer and winter Ciência Rural
Signor,Altevir; Signor,Arcangelo Augusto; Boscolo,Wilson Rogério; Reidel,Adilson; Klein,Sidnei; Feiden,Aldi.
This study evaluated the periphyton production on artificial substrates considering it as a source of low cost live food for fish. Blades of artificial substrates such as wood, black plastic, acrylic, fiberglass, ceramics and glass (all with 144cm2 blades, 24 for each substrate) were submerged 20.0cm below the water column for 35 days in the winter and 42 days in the summer. The blades were randomly installed in 200m3 pond and evaluated for the biomass production at different phases during the summer and winter. Four blades of each substrate were collected weekly, and the periphytic community was carefully scraped with a spatula and fixed in 4% formaldehyde. The periphytic biomass productivity was evaluated by artificial substrate area and per day. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microorganisms-food; Hatchery; Periphyton; Phytoplankton..
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000100072
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