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The use of morphological and histological features as nutritional condition indices of Pagrus pagrus larvae Neotropical Ichthyology
Diaz,Marina Vera; Arano,María Felisa; Pájaro,Marcelo; Aristizábal,Eddie Oscar; Macchi,Gustavo Javier.
Morphometrical and histological techniques were employed to characterize Pagrus pagrus larvae nutritional condition. Larvae were reared in laboratory under controlled conditions with the main objective of testing whether these methodologies allowed finding differences between larvae from different feeding treatments. Once yolk was consumed (three days after hatching) larvae were assigned to a feeding treatment: starved during the whole experiment; delayed feeding, starved during three days; fed during the entire experiment. Algae (Nannochloropsis oculata) and rotifers (Brachionus plicatilis) were provided to larvae for feed treatments. Larvae were fixed daily; for morphometrical purposes in 5% formaldehyde solution, and in Bouin for histological sections....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Critical period; Larvae histology; Larvae morphometry; Red porgy; Starvation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300649
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Reproductive potential of Pagrus pagrus (Perciformes: Sparidae) in coastal waters of Buenos Aires Province (Argentina) and Uruguay (34º-39ºS) Neotropical Ichthyology
Militelli,María I.; López,Sofía; Rodrigues,Karina A.; García,Sebastián; Macchi,Gustavo J..
ABSTRACT The reproductive potential of red porgy in coastal waters of Buenos Aires Province (Argentina) and Uruguay (34º-39ºS) was studied by means of a macroscopic and histological analysis of the gonads. Length and age at first maturity were determined, and fecundity, spawning frequency and egg quality were estimated. The spawning season extended from spring through summer between October and January with a peak of spawning in December. Length and age at maturity for sexes combined was 24.5 cm TL and 1.54 years, respectively. Batch fecundity ranged from 6,974 (25 cm TL) to 110,725 (39 cm TL) hydrated oocytes and showed significant linear relationships with total length and ovary-free weight. Relative fecundity ranged from 16 to 172 oocytes per female...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bonaerense Coastal Ecosystem; Fecundity; Length at first maturity; Red porgy; Spawning frequency.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200216
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