Historia de vida de Daphnia Magna y Ceriodaphnia Reticulata en condiciones de laboratorio: uso potencial como alimento para peces

Los cladóceros por su pequeña talla, rápido desarrollo y temprana reproducción, son utilizados como alimento vivo en piscicultura. Este trabajo tuvo como objetivo estudiar la historia de vida de Daphnia magna y Ceriodaphnia reticulata (Crustacea - Cladocera), bajo condiciones de laboratorio para definir su potencial como alimento en piscicultura. Fueron realizados cultivos experimentales de D. magna y C. reticulata manteniendo 12 individuos por especie en recipientes independientes de 100 ml. Como alimento se utilizó seston proveniente de la ciénaga de San Marcos – Sucre, filtrado con malla de 40 μm y mantenido en dos acuarios de 25 litros. Los parámetros poblacionales fueron medidos cada 12 horas a lo largo del periodo de vida de los especímenes. El tiempo del desarrollo embrionario fue de 16 horas para C. reticulata y 24 horas para D. magna. Se obtuvieron diferencias significativas (P≥0.05) en el crecimiento poblacional, siendo mejor el desempeño de C. reticulata (fecundidad media de 1.12 neonatos/hembra, edad y talla de la maduración de 5.9 días y 77.9 μm, respectivamente) que el de D. magna (fecundidad media de 0.71 neonatos/hembra, edad y talla de la maduración de 9 días y 256 μm, respectivamente). Los cladóceros estudiados mostraron diferencias en los parámetros poblacionales, lo que sugiere estrategias de adaptación diferentes con relación al recurso alimenticio ofrecido. En general se encontró que por su tamaño y rápido crecimiento son potencialmente útiles como alimento al inicio de la alimentación exógena de postlarvas de Prochilodus magdalenae, Brycon sinuensis y Colossoma macropomum, principales especies piscícolas en la región.

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Cyclomorphosis in Daphnia magna and Ceriodaphnia reticulata (Cladocera) from northern Tunisian groundwater: influence of temperature and invertebrates?

Crustaceana ◽

10.1163/15685403-00003460 ◽

2015 ◽

Vol 88 (10-11) ◽

pp. 1139-1148

Author(s):

H. Toumi ◽

M. Bejaoui ◽

M. Boumaiza

Keyword(s):

Water Temperature ◽

Daphnia Magna ◽

Seasonal Distribution ◽

Spine Length ◽

Influence Of Temperature ◽

Ceriodaphnia Reticulata ◽

Groundwater Wells

In the present study, we investigated cyclomorphosis in two cladocerans, Daphnia magna and Ceriodaphnia reticulata, sampled from northern Tunisian groundwater (wells) during two seasons (spring and summer). Seasonal distribution of the two species was apparent, with dominance of D. magna only in spring and C. reticulata during the whole study period. Our results showed correlations between caudal spine length of D. magna and water temperature (, ), and between caudal spine length and the density of coleopteran larvae (Stictonectes escheri, Graptodytes sp., Gyrinus urinator, and Haliplus lineaticollis) (, ). In C. reticulata, we registered a correlation (, ) only between its size and the density of larvae of Ephemeroptera (Cloeon cognatum) but no correlation with water temperature was found.

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EFECTOS SUBLETALES DE CUATRO FORMULACIONES DE GLIFOSATO SOBRE Daphnia magna Y Ceriodaphnia dubia (CRUSTÁCEA, CLADOCERA)

Natura Neotropicalis ◽

10.14409/natura.v1i47.5984 ◽

2016 ◽

Vol 1 (47) ◽

pp. 7-20

Author(s):

Ulises Reno ◽

Luciana Regaldo ◽

Ana María Gagneten

Keyword(s):

Daphnia Magna ◽

Ceriodaphnia Dubia ◽

Historia De Vida

El objetivo del presente trabajo fue evaluar, a través de ensayos crónicos de 21 días, los efectos de cuatro formulaciones comerciales deglifosato (Eskoba® (Red Surcos), Panzer Gold® (Dow Agrosciences),Sulfosato Touchdown® (Syngenta Agro) y Roundup Ultramax® (Monsanto)) sobre atributos de historia de vida y el parámetro poblacionalR o de Daphnia magna y Ceriodaphnia dubia. La fecundidad fue el atri-buto más afectado en las dos especies. Se registraron alteracionesen el ciclo de vida por la producción de huevos abortados y efipiosen D. magna expuestos a 0,15 y 0,62 mg e.a L -1 de Panzer Gold®. Además, a 0,1 y 0,31 mg e.a L -1 de los dos formulados de mayor toxicidad(Sulfosato Touchdown® y Panzer Gold®), Ro para las dos especies decladóceros fue <1, condición que indicaría una disminución pobla-cional y posible extinción local en los ambientes perturbados por losherbicidas evaluados. Se destaca la importancia de profundizar elconocimiento de los efectos subletales de formulaciones que tienenal glifosato como principio activo, mediante el análisis de componen-tes clave del ciclo de vida de las especies acuáticas.

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The occurrence, life cycle, and pathogenicity of Echinuria uncinata (Rudolphi, 1819) Soloviev, 1912 (Spirurida, Nematoda) in waterfowl at Delta, Manitoba

Canadian Journal of Zoology ◽

10.1139/z72-055 ◽

1972 ◽

Vol 50 (4) ◽

pp. 385-393 ◽

Cited By ~ 9

Author(s):

F. G. Austin ◽

H. E. Welch

Keyword(s):

Life Cycle ◽

Daphnia Magna ◽

Infective Stage ◽

Gammarus Lacustris ◽

Lesser Scaup ◽

Common Eiders ◽

Third Stage ◽

Mucosal Layer ◽

Ceriodaphnia Reticulata ◽

Sexually Mature

In the Delta Marsh, third-stage Echinuria uncinata juveniles were found in Daphnia magna, D. pulex, Simocephalus vetulus, and Gammarus lacustris. Daphnia magna, the major host, were found infected from late May to early November with a peak of 108 parasites per 100 Daphnia in early August. Experimentally, D. magna, D. pulex, Ceriodaphnia reticulata, C. acanthina, S. vetulus, Moina macrocopa, Eurycercus lamellatus, G. lacustris, Hyallela azteca, Chirocephalopsis bundyi, and Lynceus brachyurus became infected when exposed to E. uncinata eggs. Parasites developed to the infective stage in D. magna and D. pulex in 30 days at 15 °C and in 10 days at 20–24 °C.In mallard ducks, E. uncinata completed the fourth molt 20 days after infection; male worms were sexually mature after 30 days and females oviposited 40 days after infection. Parasites grew faster in 1-week-old Delta mallards than in 2- and 3-month-old birds. Adult nematodes were located beneath the mucosal layer at the junction of the proventriculus and gizzard where granulomas formed after 30 days. The number of granulomas was correlated with the number of parasites. Mallards, pintails, gadwalls, lesser scaup, common eiders, and domestic geese were more susceptible to Echinuria infection than were shovellers, blue-winged teal, redheads, ruddy ducks, and American coots. Parasite eggs died when frozen but 50% survived 85 days when dried on filter paper. Echinuria uncinata can survive winter in resident mallards.

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Membrane-bound vesicles associated with the microvilli in the midgut of the freshwater microcrustacean, Daphnia magna

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100076135 ◽

1983 ◽

Vol 41 ◽

pp. 480-481

Author(s):

Patricia L. Jansma

Keyword(s):

Daphnia Magna ◽

Intestinal Epithelial Cells ◽

Uranyl Acetate ◽

Intestinal Epithelial ◽

Chlamydomonas Reinhardii ◽

Thin Sections ◽

Saturated Water ◽

Cacodylate Buffer ◽

Membrane Bound ◽

Ethanol Series

The presence of the membrane bound vesicles or blebs on the intestinal epithelial cells has been demonstrated in a variety of vertebrates such as chicks, piglets, hamsters, and humans. The only invertebrates shown to have these microvillar blebs are two species of f1ies. While investigating the digestive processes of the freshwater microcrustacean, Daphnia magna, the presence of these microvillar blebs was noticed.Daphnia magna fed in a suspension of axenically grown green alga, Chlamydomonas reinhardii for one hour were narcotized with CO2 saturated water. The intestinal tracts were excised in 2% glutaraldehyde in 0.2 M cacodyl ate buffer and then placed in fresh 2% glutaraldehyde for one hour. After rinsing in 0.1 M cacodylate buffer, the sample was postfixed in 2% OsO4, dehydrated with a graded ethanol series, infiltrated and embedded with Epon-Araldite. Thin sections were stained with uranyl acetate and Reynolds lead citrate before viewing with the Philips EM 200.

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Computer Reconstruction of the Cellular Architecture of the Daphnia Magna Optic Ganglion

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100115043 ◽

1975 ◽

Vol 33 ◽

pp. 284-285

Author(s):

E. R. Macagno ◽

C. Levinthal

Keyword(s):

Daphnia Magna ◽

Genetic Background ◽

Compound Eye ◽

Synaptic Connectivity ◽

Serial Sections ◽

Cross Sectional ◽

Small Crustacean ◽

Optic Ganglion ◽

Structural Invariance ◽

High Degree

The optic ganglion of Daphnia Magna, a small crustacean that reproduces parthenogenetically contains about three hundred neurons: 110 neurons in the Lamina or anterior region and about 190 neurons in the Medulla or posterior region. The ganglion lies in the midplane of the organism and shows a high degree of left-right symmetry in its structures. The Lamina neurons form the first projection of the visual output from 176 retinula cells in the compound eye. In order to answer questions about structural invariance under constant genetic background, we have begun to reconstruct in detail the morphology and synaptic connectivity of various neurons in this ganglion from electron micrographs of serial sections (1). The ganglion is sectioned in a dorso-ventra1 direction so as to minimize the cross-sectional area photographed in each section. This area is about 60 μm x 120 μm, and hence most of the ganglion fit in a single 70 mm micrograph at the lowest magnification (685x) available on our Zeiss EM9-S.

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