Navegando por Assunto "Desenvolvimento larval"

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Acesso aberto (Open Access)
Composição e distribuição espaço temporal de ovos e larvas de peixes, nos estuários dos Rios Curuçá e Muriá (Curuçá-Pará)
(Universidade Federal do Pará, 2005-06-01) PALHETA, Glauber David Almeida; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Estuaries are surrounding of Transistion enter and the continent and the ocean, where rivers find the sea, resulting in the measurable dilution of the salty water. This study was carried through in order to determine the composition and distribution of eggs and larval periods of training of fish (ichthyoplankton) of the estuaries of the rivers Curuçá and Muriá, located in the northeast state of Pará (Br). For this semimonthly collections in receding tides diurne and of quadrature from September of 2003 until July of 2004 had been carried through. They had been daily pay established four stations to the long one of the estuary of the two rivers. They had been carried through measured of condutivity, pH, temperature and oxygen dissolved and carried through samples to a meter of depth that had been made with a net with mesh of 500μm and 50 cm of mouth opening, in which was connected a fluxgate Samples had been conserved with formol 4%. They had been registered 1,326 larvae, being that of these, 451 had been showed in the river Muriá and 875 larvae in the Curuçá river. The identified larvae of fish belong to the 11 families (Engraulidae, Clupeidae, Gobiidae, Scianidae, Carangidae, Pleuronectidae, Tetraodontidae, Beloniidae, Soleidae, Achiriidae and Scorpaenidae). The biggest densities had been registered in the months of July, January and March. It did not have a space standard of distribution of the larvae with the ambiental variables. The estuary of the city of Curuçá was represented mainly by clupeiformes (family Engraulidae and Clupeidae), that they play important role in the trophic net of this ecosystem as well as excellent paper in the local feeding.
Acesso aberto (Open Access)
Cultivo de larvas de Ucides cordatus (LINNAEU, 1763) sob diferentes intensidades luminosas
(2014-10) COTTENS, Kelly Ferreira; SILVA, Ubiratã de Assis Teixeira da; VENTURA, Robson; RAMOS, Fabrício Menezes; OSTRENSKY, Antonio
Ucides cordatus is an edible crab species typical of Brazilian mangroves, and traditionally represents an important economic resource for many coastal populations. The present study investigated the influence of light intensity on the survival and rate of larval development of U. cordatus. Three different levels of luminosity were evaluated: 710 (Light), 210 Lux (Shaded) and 1 Lux (Dark), both in individual and collective cultivation conditions. Significant differences were found for survival of zoea larvae under the different light intensities (P<0.05). The greatest survival rates as well as rates of ecdysis to the megalopa stage were obtained under Light conditions (42% in collective cultures and 30% in individual cultures). In Dark conditions events of metamorphosis to megalopa stage was observed only in 16% of collective cultures and 7% of individual cultures. The result indicates that low light intensities may negatively affect larval survivorship during U. cordatus larval cultivations.
Acesso aberto (Open Access)
Descrição larval de caranguejos brachyura (Crustacea: Decapoda) da região Amazônica, obtido em laboratório
(Universidade Federal do Pará, 2011-07-11) SOUZA, Adelson Silva de; COSTA, Rauquírio André Albuquerque Marinho da; http://lattes.cnpq.br/4504677939464624; ABRUNHOSA, Fernando Araujo; http://lattes.cnpq.br/9557937645632227
Larvae of the mud crab P. lacustris were reared in laboratory from ovigerous females collected in the estuarine area of the Caeté River in the Amazonian region. The complete development of this species consisted of 4 zoeal and 1 megalopal stages, where each stage was described and illustrated in detail. The results were compared with those of other previous studies on larval development of the species belonging to the genus Panopeus and then briefly discussed. Besides the description of the complete development larval of P. lacustris, has been described and illustrated the first stage zoea of thirteen species of brachyuran crabs collected in the same estuary: P. lacustris Desbonne, 1867, P. americanus Saussure, 1857, Eurytium limosum (Say, 1818), Sesarma curacaoense De Man, 1892, Sesarma rectum Randall, 1840, Armases rubripes (Rathbun, 1897), Aratus pisonii (H. Milne Edwards, 1837), Ocypode quadrata (Fabricius, 1787), Uca rapax (Smith, 1870), Uca maracoani (Latreille, 1802), Uca thayeri Rathbun, 1900, Ucides cordatus (Linnaeus, 1763) e Pachygrapsus gracilis (Saussure, 1858). Only the zoea I of P. lacustris was not described again. The morphological characteristics of these species are compared with the original descriptions. To make easy the study of plankton-collected material, it was developed a key to identification of the species described in this study.
Acesso aberto (Open Access)
Early larval development in the laboratory of Alpheus estuariensis (Crustacea: Caridea) from the Amazon Region
(2008-06) PIRES, Marcus Alexandre Borges; ABRUNHOSA, Fernando Araujo; MACIEL, Cristiana Ramalho
Here we describe and illustrate in detail four early zoeal stages of Alpheus estuariensis Christoffersen, 1984 from larvae reared in the laboratory. Two ovigerous females were collected in the tidal creek of the Bragança estuary, state of Pará, northeastern Brazil. After hatching, the larvae were placed in small containers (with 10 larvae in each). Females were deposited in the Museu Paraense Emilio Goeldi (MPEG 0803) and the larvae of each larval stage in the Zoological Museum of São Paulo University (MUSP18452). Ten larvae and exuviae were dissected with fine needles under an ocular microscope. Morphological comparisons with previous studies on larval development of the Alpheus species are briefly discussed.
Acesso aberto (Open Access)
Efeito da salinidade e da frequência alimentar durante a larvicultura dos ornamentais amazônicos acará bandeira Pterophyllum scalare (SCHULTZE, 1823) e acará severo Heros severus (HECKEL, 1840)
(Universidade Federal do Pará, 2016-07-21) EIRAS, Bruno José Corecha Fernandes; VERAS, Galileu Crovatto; http://lattes.cnpq.br/4497651649653210; COSTA, Rauquírio André Albuquerque Marinho da; http://lattes.cnpq.br/4504677939464624
With the study aimed to evaluate the effect of salinity and feeding frequency on growth, uniformity and survival of the angelfish Pterophyllum scalare and banded cichlid post-larvae. Were conducted two experiments in a completely randomized in a factorial 5 x 2, with five different sodium chloride concentrations (0; 2; 4; 6 and 8 g L-1) and two feed frequency (2 and 4 times per day). It was observed the water salinity and feeding frequency influenced significantly (p < 0,05) in torso length and body height in the angelfish larviculture. The eye diameter, was affected (p < 0,05) only by salinity, while the final standard length, standard length gain, head length, torso length, post-anal length, head height, body height, final weight, weight gain, specific growth rate and allometric condition factor differed significantly (p < 0,05) only for the feeding frequency. In the banded cichlid larviculture, there was a significant difference (p < 0,05) in the head length, post-anal length, head height and allometric condition factor by salinity and feeding frequency. The water salinity influenced significantly (p < 0,05) the final standard length, standard length gain, torso length, eye diameter, body height, survival hate and uniformity in weight. The feeding frequency influenced significantly (p < 0,05) the final weight, weight gain and specific growth rate. It was concluded that angelfish post-larvae can be grown with salinity up to 4 g L-1 without problems for the development and survival. On the other hand, the banded cichlid post-larvae had better survival hate in water without salt add. The feeding frequency of four times a day with artemia nauplii is the most recommended for the both species.
Acesso aberto (Open Access)
Larval development of Lepidophthalmus siriboia Felder & Rodrigues, 1993 (Decapoda: Thalassinidea) from the Amazon region, reared in the laboratory
(Instituto Nacional de Pesquisas da Amazônia, 2005) ABRUNHOSA, Fernando Araujo; PIRES, Marcus Alexandre Borges; LIMA, Jô de Farias; COELHO FILHO, Petrônio Alves
The complete larval development of the ghost shrimp Lepidophthalmus siriboia Felder & Rodrigues, 1993 was described and illustrated in detail from specimens reared in the laboratory. Ovigerous females were collected at Canela Island in the northeastern region of the State of Pará. The larvae hatch as a prezoea, in which they persist for less than 3 hours. The larval development consists of three zoeal stages and a megalopa. The zoeal development averaged from 69 to 111 hours. The period in the megalopa stage was about 185 hours (about 8 days). The percentage of individuals succeeding in molt into juvenile stage was 91,8%. The first juvenile stage was reached 254 hours (about 10 days) after hatching. Morphological comparisons and their relationship with larvae of congeneric species are briefly discussed.
Acesso aberto (Open Access)
Lecithotrophic behaviour in zoea and megalopa larvae of the ghost shrimp Lepidophthalmus siriboia Felder and Rodrigues, 1993 (Decapoda: Callianassidae)
(2008-12) ABRUNHOSA, Fernando Araujo; SIMITH, Darlan de Jesus de Brito; PALMEIRA, Carlos André Melo; ARRUDA, Danielle Cristina Bulhões
Food supply is considered critical for a successful culturing of decapod larvae. However, some species may present yolk reserve sufficient to complete their larval development without external food supply (known as lecithotrophic larval development). In the present study, two experiments were carried out in order to verify whether the callianassid Lepidophthalmus siriboia have lecithotrophic behaviour or, if they need external food for their larval development: Experiment 1, larvae submitted to an initial feeding period and Experiment 2, larvae submitted to an initial starvation period. High survival rate was observed in both experiments, in which only 2 megalopae and 1 zoea III died. These results strongly suggest that larvae of L. siriboia are lecithotrophic as they have sufficiently large yolk reserve to complete their larval development, while the megalopa stage shows facultative lecithotrophy. The larval periods of each stage of the treatments were quite similar and, despite some significant differences in some larval periods, these can be related probably to larval rearing conditions, abiotic factors or, individual variability of larval health, as well as stress caused to the ovigerous females during embryogenesis.
Acesso aberto (Open Access)
The morphology of the foregut of larvae and postlarva of Sesarma curacaoense De Man, 1892: a species with facultative lecithotrophy during larval development
(Instituto Nacional de Pesquisas da Amazônia, 2006) MELO, Marlon Aguiar; ABRUNHOSA, Fernando Araujo; SAMPAIO, Maria Iracilda da Cunha
Previous study on the resistance of larvae of Sesarma curacaoense submitted to starvation has revealed a facultative lecithotrophy during zoeal stages, but megalopa and first juvenile stages are exclusively feeding stages. In the present study, the gross morphology and fine structure of the foregut of S. curacaoense were investigated during larval, megalopa and first juvenile stages. The foregut of the zoea I show specific setae and a filter press apparently functional. The foregut undergoes changes in the zoea II (last larval stage) with increment of setae number, mainly on the cardiopyloric valve and complexity of the filter press. After metamorphosis to megalopa stage the foregut become rather complex, with a gastric mill supporting a medial and two lateral teeth well-developed. The foregut of the first juvenile is more specialized compared to the previous stage, showing similar characteristics of the decapod adults. These results provide further evidence of facultative lecithotrophic development in the larvae of S. curacaoense.
Acesso aberto (Open Access)
Ontogenesis and functional morphology of the digestive system of the freshwater prawn, Macrobrachium amazonicum (Decapoda: Palaemonidae)
(2011-06) QUEIROZ, Luciano Domingues; ABRUNHOSA, Fernando Araujo; MACIEL, Cristiana Ramalho
The appropriate feeding regime for larvae and post-larvae of crustacean decapods is essential for successful larval culture. Reports on the development and morphology of the mouthparts and foregut of these crustaceans have aided in the selection of appropriate larval foodstuffs and consequently increased larval survival and growth rate during development. In the present study, the functional morphology of foregut and mouthparts was investigated in larvae and post-larvae of the freshwater prawn M. amazonicum (Heller, 1862). From observations gathered on both the outer and inner feeding apparati the first stage larvae have obligatory lecithotrophy and feeding behaviour is initiated after molting to the second stage. The foregut of the larvae undergoes diverse morphological changes during larval development and the larval foregut of this species is primarily a mixing organ due to the absence of gastric mills and similar structures. After metamorphosis into post-larvae, drastic morphological changes occur in the foregut and mouthparts to adapt the animals to feed on the greater diversity of foods that are available in their new benthic habitat.
Acesso aberto (Open Access)
The importance of feeding in the larval development of the ghost shrimp Callichirus major (Decapoda: Callianassidae)
(2008-09) ABRUNHOSA, Fernando Araujo; ARRUDA, Danielle Cristina Bulhões; SIMITH, Darlan de Jesus de Brito; PALMEIRA, Carlos André Melo
The present study investigated whether the callianassid Callichirus major shows a lecithotrophic behaviour during larval development. Two experiments were carried out. In the first experiment, larvae were subjected to an initial period of feeding, while in the second they were subjected to an initial period of starvation. In Experiment 1, 80% of C. major larvae succeeded moulting to juvenile stage in treatment with larvae fed every day. In the treatments with larvae fed for 1, 2 and 3 days there was total mortality before they reached the megalopal stage. In Experiment 2, zoea larvae showed more resistance when subjected to an initial period of starvation in which larvae starved for 1, 2 and 3 days and had survival rates of 100, 60 and 80%, respectively. But, a delay in the development duration of the zoeal stages was observed. Total mortality was observed for larvae reared in the treatment with entire starvation. The results suggest that zoeal stages of C. major are not lecithotrophic.