Morphological description of the developmental stages of Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes, Auchenipteridae) on the floodplain of the upper Paraná River

Sanches, Paulo Vanderlei; Nakatani, Keshiyu; Bialetzki, Andréa

doi:10.1590/s0034-71081999000300007

Cited by 43 publications

(47 citation statements)

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“…Interestingly, even though S. parahybae migrate to mate, their progeny do not develop quickly. The embryonic development time showed by S. parahybae is similar to or even faster than non-migratory fish species, such as Hoplias malabaricus and Parauchenipterus galeatus, which hatched 44 h at 24-26.5°C and 64 h at 27-28°C AF, respectively (Sanches et al, 1999). However it must be considered that the experimental temperature for S. parahybae in the present study was lower (23°C) than most of the species above described, another reason for the slower development speed, since teleosts are ectothermic vertebrates.…”

Section: Discussionmentioning

confidence: 86%

Embryonic development and larval stages of Steindachneridion parahybae (Siluriformes: Pimelodidae): implications for the conservation and rearing of this endangered Neotropical species

et al. 2012

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Steindachneridion parahybae is a freshwater catfish endemic to the Paraíba do Sul River and is classified as an endangered Neotropical species. An increasing number of conservation biologists are incorporating morphological and physiological research data to help conservation managers in rescue these endangered species. This study investigated the embryonic and larval development of S. parahybae in captivity, with emphasis in major events during the ontogeny of S. parahybae. Broodstocks were artificially induced to reproduce, and the extrusion occurred 200-255 degree-hours after hormonal induction at 24°C. Larval ontogeny was evaluated every 10 minutes under microscopic/stereomicroscopic using fresh eggs samples. The main embryogenic development stages were identified: zygote, cleavage, including the morula, blastula, gastrula phase, organogenesis, and hatching. The extruded oocytes showed an average diameter of 1.10 ± 0.10 mm, and after fertilization and hydration of eggs, the average diameter of eggs increased to about 1.90 ± 0.60 mm, characterized by a large perivitelline space that persisted up to embryo development, the double chorion, and the poles (animal and vegetative). Cell division started about 2 minutes after fertilization (AF), resulting in 2, 4, 8 (4 x 2 arrangement of cells), 16 (4 x 4), 32 (4 x 8) and 64 (2 x 4 x 8) cells. Furthermore, the blastula and gastrula stages followed after these cells divisions. The closed blastopore occurred at 11 h 20 min AF; following the development, the organogenetic stages were identified and subdivided respectively in: early segmentation phase and late segmentation phase. In the early segmentation phase, there was the establishment of the embryonic axis, and it was possible to distinguish between the cephalic and caudal regions; somites, and the optic vesicles developed about 20 h AF. Total hatching occurred at 54 h AF, and the larvae average length was 4.30 ± 0.70 mm. Gradual yolk sac reduction was observed during the first two days of larval development. The first feeding occurred at the end of the second day. During the larval phase, cannibalism, heterogeneous larval growth and photophobia were also observed. This information will be important in improving the artificial reproduction protocols of S. parahybae in controlled breeding programs.Steindachneridion parahybae é um bagre de água doce, endêmico do rio Paraíba do Sul e é classificado como espécie neotropical ameaçada. Um número crescente de biólogos conservacionistas estão incorporando dados de pesquisas morfológicas e fisiológicas para ajudar os gestores de conservação no resgate destas espécies ameaçadas de extinção. Este estudo investigou o desenvolvimento embrionário e larval de S. parahybae em cativeiro, com ênfase nos principais eventos durante a ontogenia de S. parahybae. Reprodutores foram artificialmente induzidos à reprodução e a extrusão ocorreu com 200-255 horas-graus após a indução hormonal a 24°C. A ontogenia larval foi avaliada a cada 10 minutos sob microscópio/ estereomicroscópio, utiliz...

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Section: Discussionmentioning

confidence: 86%

Embryonic development and larval stages of Steindachneridion parahybae (Siluriformes: Pimelodidae): implications for the conservation and rearing of this endangered Neotropical species

et al. 2012

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“…The study of the initial life cycle phases is essential for elucidating both taxonomic and ecological issues (Sanches et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Observation of the embryonic development in Pseudoplatystoma coruscans (Siluriformes: Pimelodidae) under light and scanning electron microscopy

Marques

Nakaghi

Faustino

et al. 2008

Zygote

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SummaryPseudoplatystoma coruscans is a very popular species for tropical fish culture as it has boneless meat of delicate taste and firm texture. Few studies on fish reproductive biology refer to the morphological features of eggs. The goal, therefore, of this present work was to perform a structural and ultrastructural analysis of fertilization and embryonic development in P. coruscans. The incubation period, from fertilization to hatching, lasts 13 h at 28/29• C and 18 h at 27• C. The oocytes had a mean diameter of 0.95 mm and hatched larvae were 2.55 mm in diameter. Analysing their development, we observed round, yellow oocytes that bore a double chorion membrane and a single micropyle. At 10 s after fertilization, several spermatozoa were detected attached to the oocyte surface. After 1 min of development, a fertilization cone that obstructed the micropyle could be observed. Segmentation started between 20 and 30 min after fertilization, when the egg cell was then formed. The first cleavage occurred between 30 and 45 min after fertilization, prior to reaching the morula stage (75 and 90 min after fertilization). The epiboly movement started at 120 and 180 min after fertilization and ended at 360 and 480 min after fertilization. Differentiation between cephalic and caudal region was detected after 420 and 600 min after fertilization and larvae hatched between 780 and 1080 min after fertilization. Seven main embryonic development stages were identified: egg cell, cleavage, morula, blastula, gastrula, segmentation with differentiation between cephalic and caudal regions, and hatching.

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“…Novoa & Cataño-Vergara observaron en Sorubim cuspicaudus un diámetro promedio de1492 µm para los óvulos y de 3320 µm de longitud de las larvas recién eclosionadas, mientras que Clavijo-Ayala & Arias-Castellanos (2004a), en Rhamdia sebae, reportaron un diámetro promedio de 930 µm para los óvulos. El diámetro de los óvulos es probable que esté relacionado con el modo de fertilización de cada especie, siendo que las especies que presentan fertilización externa, por lo general producen óvulos de menor tamaño que aquellas que poseen fertilización interna (Sánchez et al, 1999). El diámetro de los óvulos también influye sobre el período de incubación, siendo que óvulos de mayor tamaño tienen un tiempo de incubación más largo que óvulos pequeños (Sargent et al, 1987).…”

Section: Discussionunclassified

Desarrollo Embrionario del Capaz Pimelodus grosskopfii (Steindachner, 1879)

et al. 2012

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VALBUENA-VILLARREAL, R. D.; ZAPATA-BERRUECOS B. E.; DAVID-RUALES, C. & CRUZ-CASALLAS, P. E. Desarrollo embrionario del capaz Pimelodus grosskopfii (Steindachner, 1879). Int. J. Morphol., 30(1):150-156, 2012. RESUMEN:El conocimiento del desarrollo embrionario en los peces es especialmente importante en especies nativas con potencial para la piscicultura, en virtud que permite identificar eventos morfológicos y cronológicos, necesarios para establecer prácticas de manejo durante las fases de incubación y larvicultura. El capaz (Pimelodus grosskopfii) es una especie con potencial para cultivo comercial, por sus hábitos alimenticios omnívoros y aceptación de su carne en el mercado. Para estudiar el desarrollo embrionario de la especie, ejemplares adultos sexualmente maduros fueron inducidos a la reproducción con extracto de hipófisis de carpa (5,75 y 4,0 mg• Kg -1 , hembras y machos, respectivamente). Los óvulos seminados fueron incubados en un sistema de flujo ascendente de 30 L a 27 ± 1°C. Las muestras (n=30) fueron colectadas al momento de la extrusión, durante la fertilización y cada 15 minutos a partir de las 0 horas postfertilización (HPF) hasta las 2 horas y cada 30 minutos desde las 2 HPF hasta 5 HPF; finalmente, entre las 5 HPF y la eclosión, cada 60 minutos. Los óvulos fertilizados presentaron forma esférica, sin adherencias y con amplio espacio perivitelino. El desarrollo embrionario finalizó a las 12 HPF. La diferenciación del polo animal y vegetal ocurrió a las 0,2 HPF, el primer clivaje a las 0,3 HPF, el blastodisco alto y estratificado a las 1,8 HPF, el blastodisco achatado a las 3,3 HPF, la epibolia < a 50 % se observó a las 4 HPF, el cierre del blastoporo a las 5,7 HPF, la diferenciación cráneo caudal e inicio de la neurolación a las 7 HPF, la diferenciación de las vesículas ópticas, óticas y vesícula de Kupffer a las 8,5 HPF, la liberación de la cola del vitelo a las 10 HPF, los primeros movimientos se observaron a las 10,5 HPF y finalmente la eclosión ocurrió a las 12 HPF. Las larvas al eclosionar presentaron una longitud total de 2987±67 µm, sin pigmentación, tracto digestivo rudimentario, sin abertura bucal ni anal y presencia de cromatóforos en el saco vitelino.

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Morphological description of the developmental stages of Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes, Auchenipteridae) on the floodplain of the upper Paraná River

Cited by 43 publications

References 5 publications

Embryonic development and larval stages of Steindachneridion parahybae (Siluriformes: Pimelodidae): implications for the conservation and rearing of this endangered Neotropical species

Embryonic development and larval stages of Steindachneridion parahybae (Siluriformes: Pimelodidae): implications for the conservation and rearing of this endangered Neotropical species

Observation of the embryonic development in Pseudoplatystoma coruscans (Siluriformes: Pimelodidae) under light and scanning electron microscopy

Desarrollo Embrionario del Capaz Pimelodus grosskopfii (Steindachner, 1879)

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