Validación de la hipótesis de mortalidad por inanición en larvas de Engraulis ringens Jenyns, 1842 (Pisces: Engraulidae), utilizando el criterio histológico en un área de surgencia costera en el norte de Chile

E., Jessica Pizarro; S., Winston Palma; C, Claudio

doi:10.4067/s0717-71781998002600009

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…However, differences in otolith growth patterns between autumn-winter and spring-summer cohorts are not so marked, which is indicative of favourable conditions for early growth for these species all year round. Indeed, some studies on the feeding of larval fish have demonstrated that although larval food abundance may vary among seasons and localities along the HCS in Chile, starvation due to limited food availability alone does not seem to be such a common feature in this species, even in seasons of lower production (autumn and winter; Pizarro et al 1998;Thiel et al 2007). Moreover, for E. ringens in northern Chile, a low incidence of starvation was reported during autumn (Pizarro et al 1998).…”

Section: Fast Growth Before Recruitmentmentioning

confidence: 99%

Daily growth patterns of juveniles and adults of the Peruvian anchovy (Engraulis ringens) in northern Chile

Cerna

Plaza

2016

Mar. Freshwater Res.

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Abstract. The Peruvian anchovy (Engraulis ringens) is a resource of considerable economic importance, whose stock unit is distributed between 16800 0 S and 24800 0 S and is shared between Chile and Peru. In the present study, daily growth patterns of juvenile and adult Peruvian anchovies in northern Chile were determined using micro-increments of sagittal otoliths for the recruitment and fishery seasons of 2009 and 2010. A characteristic feature was the existence of very distinctive daily micro-increments, through which a complete sequence of micro-increments was obtained from the primordium to otolith edge for juveniles (7.5-12-cm total length (TL)) and adults (12.5-18.0 cm TL), whose ages were in the range 56-166 and 137-409 days respectively. Hatch dates extended from July 2009 to July 2010, where juveniles recruited to a fishery in a given month were the survivors of a spawning that had occurred approximately 3-4 months before. A Laird-Gompertz model fitted to length-at-age data for juveniles estimated maximum instantaneous growth rates that ranged from 0.98 to 1.57 mm day À1, whereas overall mean individual growth rates back-calculated for the age range of juveniles ranged from 0.65 to 1.02 mm day À1. The von Bertalanffy seasonal parameters estimated through the entire life history showed high growth, with a growth coefficient K ¼ 1.1 and mean length at the first year of 16.3 cm TL. Consequently, E. ringens in northern Chile seems to maximize growth in the first year of life.

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Section: Fast Growth Before Recruitmentmentioning

confidence: 99%

Daily growth patterns of juveniles and adults of the Peruvian anchovy (Engraulis ringens) in northern Chile

Cerna

Plaza

2016

Mar. Freshwater Res.

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“…Despite the high environmental heterogeneity linked to the upwelling circulation within Mejillones Bay, the distribution patterns of the coastal pelagic fish larvae in northern Chile usually show a direct relationship with high chlorophyll concentrations, since it shows high concentration (5 mg m ) from coast to 20 km offshore (Yuras et al, 2005), in the same areas where spawning of clupeiform fishes occur (Morales et al, 1996). This spatial pattern may explain the reduced starvation mortality estimated for anchovy larvae detected by Pizarro et al (1998).…”

Section: Discussionmentioning

confidence: 93%

“…Off northern Chilean coast presence of dense abundances of phyto-and zooplankton near surface and nearshore during the spawning period (austral winter) could facilitate a successful larval feeding (Escribano, 1998;Escribano & Hidalgo, 2000;Herrera & Escribano, 2006). However, the cross-shelf currents derived from the upwelling process may cause significant offshore transport of fish eggs and larvae as well as mortality due starvation in fish larvae advected to oceanic waters (Pizarro et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Rojas¹,

Landaeta²

2014

lajar

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ABSTRACT. The influence of oceanic circulation and bathymetry on the fish larvae retention inside Mejillones Bay, northern Chile, was examined. Fish larvae were collected during two coastal upwelling events in November 1999 and January 2000. An elevated fish larvae accumulation was found near an oceanic front and a zone of low-speed currents. Three groups of fish larvae were identified: the coastal species (Engraulis ringens and Sardinops sagax), associated with high chlorophyll-a levels; larvae from the families Phosichthyidae (Vinciguerria lucetia) and Myctophidae (Diogenichthys laternatus and Triphoturus oculeus), associated with the thermocline (12°C), and finally, larvae of the families Myctophidae (Diogenichthys atlanticus) and Bathylagidae (Bathylagus nigrigenys), associated with high values of temperature and salinity. The presence of a seamount and submarine canyon inside Mejillones Bay appears to play an important role in the circulation during seasonal upwelling events. We propose a conceptual model of circulation and particles retention into Mejillones Bay. The assumption is that during strong upwelling conditions the flows that move along the canyon emerge in the centre of Mejillones Bay, producing a fish larvae retention zone. Understanding the biophysical interactions responsible to trap and/or concentrate particles is essential to protect these fragile upwelling ecosystems.

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“…Long term tissues (muscle, notochord, cartilage, and nervous system) only showed histological changes under extreme starvation suffered from starved treatment larvae and only few studies have analyzed their response to starvation (O'Connell, 1976;Uriarte & Balbontín, 1987;Pizarro et al, 1998;Catalán & Olivar, 2002;Catalán, 2003). On the other hand, short term tissues (gut, liver, and pancreas) have been widely used and probed to be more sensitive to starvation than long term tissues (Sieg, 1998;Chen et al, 2007;Diaz et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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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Validación de la hipótesis de mortalidad por inanición en larvas de Engraulis ringens Jenyns, 1842 (Pisces: Engraulidae), utilizando el criterio histológico en un área de surgencia costera en el norte de Chile

Cited by 7 publications

References 4 publications

Daily growth patterns of juveniles and adults of the Peruvian anchovy (Engraulis ringens) in northern Chile

Daily growth patterns of juveniles and adults of the Peruvian anchovy (Engraulis ringens) in northern Chile

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

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

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