Development of red porgy Pagrus pagrus visual system in relation with changes in the digestive tract and larval feeding habits

Roo, Francisco J.; Socorro, J.; Izquierdo, M.S.; Caballero, M. J.; Hernández-Cruz, C.M; Fernández, A.; Fernández‐Palacios, H.

doi:10.1016/s0044-8486(99)00183-0

Cited by 74 publications

(64 citation statements)

References 16 publications

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“…Thus, feeding should start soon after hatching. This requires a fast development of different structures and tissues related to prey capture and digestion (Roo et al, 1999). Complete yolk exhaustion was observed between three to four DAH at 18°C of rearing temperature, in coincidence with previous studies made by Machinandiarena et al (2003), Aristizábal & Suárez (2006) and Aristizábal et al (2009).…”

Section: Discussionsupporting

confidence: 88%

“…Thus, when yolk sac is exhausted porgy larvae normally suffer a short starvation period until gut and visual system are functional. When larvae reach four DAH, their ability to capture prey increases dramatically (Roo et al, 1999). Therefore, during our investigation, fed larvae showed a constant increment in all measured morphometrical variables from four DAH.…”

Section: Discussionmentioning

confidence: 52%

“…In contrast to other variables, eye diameter showed a continuous increase throughout the experiment in both fed and starved larvae. Roo et al (1999) have found high correlations between larval total length and eye diameter. These authors have suggested that size increase and visual system development would improve their swimming ability allowing prey capture, as well as identifying and escaping from predators.…”

Section: Discussionmentioning

confidence: 94%

“…Delayed feeding larvae recovered after starvation but did not reach fed larvae sizes until the end of the experiment 11 DAH. Roo et al (1999) studied gut and eye development employing porgy larvae and they found that mouth opening took place simultaneously with yolk exhaustion three DAH at 20-21ºC. But larvae did not start external feeding until four DAH when visual system is completely ready for prey capture.…”

Section: Discussionmentioning

confidence: 99%

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The use of morphological and histological features as nutritional condition indices of Pagrus pagrus larvae

et al. 2013

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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. Results herein obtained showed that both methodologies are sensitive enough to distinguish larvae characterized by different nutritional condition states obtained from the feeding treatments. Consequently, these methodologies could be employed in wild red porgy larvae in order to asses their nutritional condition. These techniques could also be employed to check larval quality obtained with aquaculture purposes to estimate the effects of changes in rearing protocols or kind of food supply and thus, to guaranty a higher survival of early developmental stages of reared larvae.Con el objeto de determinar si las técnicas morfométricas e histológicas permiten diferenciar larvas en estado de inanición de las sometidas a tratamientos de alimentación, ejemplares de Pagrus pagrus fueron criados en laboratorio bajo condiciones controladas. Una vez que el vitelo fue consumido (tres días luego de la eclosión) las larvas fueron sometidas a diferentes tratamientos de alimentación: completamente privadas de alimento, privadas de alimento durante tres días y luego alimentadas, y alimentadas durante todo el experimento. Algas (Nannochloropsis oculata) y rotíferos (Brachionus plicatilis) fueron proporcionados a las larvas de los tratamientos de alimentación. Diariamente se fijaron ejemplares de los tres tratamientos en formol 5% para estudios morfométricos y en Bouin para estudios histológicos. Los resultados obtenidos dan evidencias de que las metodologías presentadas son suficientemente sensibles para determinar diferencias en la condición de larvas sometidas a los tratamientos de alimentación. Por lo tanto, podrían ser empleadas para determinar la condición nutricional de las larvas de besugo recolectadas en el mar. Por otra parte, éstas metodologías podrían ser empleadas para determinar la calidad de larvas producidas en acuicultura y evaluar los efectos de modificaciones introducidas en los protocolos de crianza o en el tipo de alimento suministrado con el objeto de mejorar la supervivencia de los estadios tempranos de desarrollo.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

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The use of morphological and histological features as nutritional condition indices of Pagrus pagrus larvae

et al. 2013

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“…This is due to the lack of a morphological and functional stomach in larvae (Govoni et al 1986). The feeding habits of fish larvae are correlated with the digestive structure (Stroband & Kroon 1981;Luizi et al 1999;Roo et al 1999) so that opening of the mouth and consequently the start of exogenous feeding determine regional gut differentiation in most teleost species (Mai et al 2005).…”

Section: Developed Pharyngeal Teeth (Pt) In the Areolar Connective mentioning

confidence: 99%

Early ontogenetic development of digestive system inSchizothorax zarudnyiNikolskii, 1897 (Actinopterygii: Cyprinidae) larvae

Moghadam¹,

Behrouz²,

Rezaei³

et al. 2014

Italian Journal of Zoology

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The development of digestive tract and accessory glands in Hamun mahi (Schizothorax zarudnyi, Family: Cyprinidae) from hatching to 21 days after hatching (DAH) is described in this study. This information is critical for evaluating the digestive tract functional capacity and physiology of digestion in larvae, and designing optimal rearing techniques and artificial diets for this commercially valuable species. Based upon its feeding mode and structural changes in the digestive tract, larval ontogeny in S. zarudnyi was divided into three stages, Stage 1: 0-2 DAH, Stage 2: 3-8 DAH and Stage 3: from 9 DAH onwards. As in most teleosts, Hamun mahi at hatching had an undifferentiated digestive tract. The most critical ontogenetic events occurred at Stage 2. At the beginning of Stage 2, mouth opened in conjunction with the differentiation of the digestive tract. During Stages 2 and 3 the gut differentiated, and buccopharyngeal cavity, oesophgus and incipient intestine became distinguishable. At this stage digestive tract processes continued to develop (e.g. entrocyte's brushborders, appearance of digestive mucous cells at 4 DAH, and gut mucosal folds). The first taste buds and pharyngeal teeth appeared at the beginning of Stage 2. Histological observations suggest that digestive tract development of the Hamun mahi larvae, involving the presence of functional liver (vacuolated hepatocyes), exocrine and endocrine pancreas, and gallbladder enabled early larvae (from 3 DAH) to ingest, digest and assimilate the first exogenous food, even before endogenous reserves were completely resorbed. From Stage 3 onwards, most organs essentially exhibited an increase in tissue structure, size and number.

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Feeding behavior in Larval Fish

Yúfera

2011

Larval Fish Nutrition

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Development of red porgy Pagrus pagrus visual system in relation with changes in the digestive tract and larval feeding habits

Cited by 74 publications

References 16 publications

The use of morphological and histological features as nutritional condition indices of Pagrus pagrus larvae

The use of morphological and histological features as nutritional condition indices of Pagrus pagrus larvae

Early ontogenetic development of digestive system inSchizothorax zarudnyiNikolskii, 1897 (Actinopterygii: Cyprinidae) larvae

Feeding behavior in Larval Fish

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