Dictyocaulus filaria: in lambs: The effect of varying single infections on subsequent larval production

1978 ◽  
Vol 4 (3) ◽  
pp. 221-229 ◽  
Author(s):  
D.N. Dhar ◽  
R.L. Sharman
Keyword(s):  
Larval Production

Spatial ecology and growth in early life stages of bay anchovy Anchoa mitchilli in Chesapeake Bay (USA)

2020 ◽  
Vol 651 ◽  
pp. 125-143
Author(s):  
TD Auth ◽  
T Arula ◽  
ED Houde ◽  
RJ Woodland
Keyword(s):  
Chesapeake Bay ◽  
Spatial Ecology ◽  
Environmental Variability ◽  
Larval Growth ◽  
Larval Abundance ◽  
Spatial And Temporal Variability ◽  
Estuarine Ecosystem ◽  
Anchoa Mitchilli ◽  
Larval Production ◽  
Bay Anchovy

The bay anchovy Anchoa mitchilli is the most abundant fish in Chesapeake Bay (USA) and is a vital link between plankton and piscivores within the trophic structure of this large estuarine ecosystem. Baywide distributions and abundances of bay anchovy eggs and larvae, and larval growth, were analyzed in a 5 yr program to evaluate temporal and spatial variability based on research surveys in the 1995-1999 spawning seasons. Effects of environmental variability and abundance of zooplankton that serve as prey for larval bay anchovy were analyzed. In the years of these surveys, 97.6% of eggs and 98.8% of larvae occurred in the polyhaline lower bay. Median egg and larval abundances differed more than 10-fold for surveys conducted in the 5 yr and were highest in the lower bay. Within years, median larval abundance (ind. m-2) in the lower bay was generally 1-2 orders of magnitude higher than upper-bay abundance. Salinity, temperature, and dissolved oxygen explained 12% of the spatial and temporal variability in egg abundances and accounted for 27% of the variability in larval abundances. The mean, baywide growth rate for larvae over the 5 yr period was 0.75 ± 0.01 mm d-1, and was best explained by zooplankton concentration and feeding incidence. Among years, mean growth rates ranged from 0.68 (in 1999) to 0.81 (in 1998) mm d-1 and were fastest in the upper bay. We identified environmental factors, especially salinity, that contributed to broadscale variability in egg and larval production.

Recolonization of lake whitefish river spawning ecotypes and estimates of riverine larval production in Green Bay, Lake Michigan

2021 ◽  
Author(s):  
Andrew L. Ransom ◽  
Christopher J. Houghton ◽  
S. Dale Hanson ◽  
Scott P. Hansen ◽  
Lydia R. Doerr ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Lake Whitefish ◽  
Green Bay ◽  
Larval Production

scholarly journals Larval Fish Community in the Northwestern Iberian Upwelling System during the Summer Period

Oceans ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 700-722
Author(s):  
Sonia Rábade Uberos ◽  
Alba Ruth Vergara Castaño ◽  
Rosario Domínguez-Petit ◽  
Fran Saborido-Rey
Keyword(s):  
Community Composition ◽  
Fish Community ◽  
Larval Fish ◽  
Life Stages ◽  
Early Life Stages ◽  
Summer Period ◽  
Specific Composition ◽  
Larval Production ◽  
High Diversity ◽  
Northwestern Iberian Peninsula

The Galician shelf (northwestern Iberian Peninsula) is a highly dynamic area with an important multi-species fisheries industry that exploits resources from several habitats, characterized by being not only highly diverse, rich, and productive but also seasonally and interannually variable. Early life stages of different species are distributed throughout the year, with fluctuating abundances and community composition. Likewise, the influence of environmental factors and processes on larval production and survival remains unknown. Sampling was carried out in July 2012, and all the larvae obtained were identified to establish the specific composition of the community in a summer upwelling scenario. The results show no zonation in the species distribution, a consequence of the mixing effects of the upwelling and eddies, with high diversity but low abundance, which render in a slight predominance of a few species. Due to the dependence of planktonic populations on upwelling events, which was not highly pronounced in 2012, we cannot conclude that this was a typical conformation of the Galician summer larval fish community, but it is a first approach to comprehend the community composition.

scholarly journals Experimental infections of muskoxen (Ovibos moschatus) and domestic sheep with Umingmakstrongylus pallikuukensis (Nematoda: Protostrongylidae): parasite development, population structure, and pathology

1999 ◽  
Vol 77 (10) ◽  
pp. 1562-1572 ◽  
Author(s):  
S J Kutz ◽  
E P Hoberg ◽  
L Polley
Keyword(s):  
Parasite Development ◽  
Domestic Sheep ◽  
Lung Pathology ◽  
Experimental Conditions ◽  
Ovibos Moschatus ◽  
Lung Cysts ◽  
Pulmonary Cysts ◽  
Third Stage ◽  
Larval Production ◽  
Umingmakstrongylus Pallikuukensis

Three captive muskoxen (Ovibos moschatus) were successfully infected with third-stage larvae of Umingmakstrongylus pallikuukensis digested or emerged from the slugs Deroceras reticulatum and D. laeve, for the first time completing the life cycle of this parasite under experimental conditions. The course of parasite development and patency was followed for 26 months post infection (p.i.) using fecal examinations and radiography. The prepatent periods in two of the muskoxen were 91 and 95 days and the patent period in one extended for 23 months. Larval production peaked 13-14 months p.i. On postmortem of two of the muskoxen at months 14 and 26 p.i., adult parasites were found only within pulmonary cysts and cysts were randomly distributed between left and right lungs. Cyst dimensions were positively correlated with the number of adult parasites they contained. On postmortem of the third muskox at day 97 p.i., not all adult parasites were within typical cysts; two were found free in interlobular septa. First-stage larvae were recovered from lung cysts of this animal but not from feces. Lung pathology in all three muskoxen appeared localized and associated with the adult nematodes. Infection of two sheep with third-stage larvae of U. pallikuukensis did not result in parasite establishment.

Evaluation of the Suitability of Marine Copepods as an Alternative Live Feed in High-Health Fish Larval Production

2018 ◽  
pp. 277-292
Author(s):  
P. Santhanam ◽  
N. Jeyaraj ◽  
K. Jothiraj ◽  
S. Ananth ◽  
S. Dinesh Kumar ◽  
...  
Keyword(s):  
Live Feed ◽  
Larval Production ◽  
Marine Copepods

Effects of Microalgae Chlorella vulgaris Density on the Larval Performances of Fresh Water Prawn Macrobrachium rosenbergii (De Man, 1879)

2021 ◽  
Author(s):  
R.T. Mathew ◽  
Y.A. Alkhamis ◽  
S.M. Rahman ◽  
A.S. Alsaqufi
Keyword(s):  
Fresh Water ◽  
Chlorella Vulgaris ◽  
Macrobrachium Rosenbergii ◽  
Dry Weight ◽  
Larval Survival ◽  
Crustacean Species ◽  
Treatment Groups ◽  
Potential Applications ◽  
Larval Production ◽  
De Man

Background: Microalgae have several potential applications in early stages especially in the hatchery phase of several fish, mollusc and crustacean species. The present study aimed to evaluate the effects of microalgae Chlorella vulgaris at different concentrations on larval performances of Macrobrachium rosenbergii. Methods: Freshly hatched larvae were reared until the metamorphosis of first post larval (PL) stage in plastic aquaria (5 liter, 12ppt and 12L:12D) with a density of 10 larvae/liter under five randomly arranged treatment groups in 3 replicates such as, 0×105 (T1, control) and four different concentrations of C. vulgaris 5×105 (T2), 10×105 (T3), 15×105 (T4) and 20×105 (T5) cells/ml. Larvae were fed Artemia (6 nauplii/ml) six times daily. Result: The results revealed that the addition of microalgae in rearing system significantly enhanced (P less than 0.05) the larval survival and developments than without microalgae. The highest larval survival and faster appearance of PL (in days) was observed in T3 group (60.83%, 24.67 days) followed by T4 (56.91%, 28.33 days) T2 (48.39%, 31.33 days) T5 (40.93%, 32.33 days) and T1 (30.65%, 39 days), respectively. Larvae reared at moderate concentrations of microalgae (T3 and T4) resulted in high dry weight that of extreme low (T2) or high (T5) concentrations of microalgae. This study identified the best concentration of Chlorella vulgaris for the rearing of M. rosenbergii larval and could be applicable for the mass larval production of this species commercially.

Colorado Potato Beetle (Coleoptera: Chrysomelidae) Survival and Fecundity after Short- and Long-Term Rearing on Artificial Diets

2003 ◽  
Vol 38 (1) ◽  
pp. 48-58 ◽  
Author(s):  
Kevin W. Thorpe ◽  
Robert L. Bennett
Keyword(s):  
Leptinotarsa Decemlineata ◽  
Adult Survival ◽  
Artificial Diets ◽  
Egg Hatch ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Larval Production ◽  
Potato Foliage ◽  
Short And Long Term

Survival, fecundity, and development time of Colorado potato beetles, Leptinotarsa decemlineata (Say), reared for a single generation or multiple generations (7 to 9) on one of three artificial diets or potato foliage and then switched back to potato foliage were measured. There were no consistent differences in any of the variables among diets regardless of whether the insects had been reared for one or many generations on artificial diets. Adult survival was about 80% at 10 wks after eclosion and <10% after 30 wks. Females produced an average of 977 and 796 eggs by week 16 after being reared for a single and for many generations, respectively, on artificial diets. Egg hatch rates ranged from 81% at week 3 to 14% on week 15, resulting in an average larval production of 516 and 552 by week 16 for females reared for a single and for many generations, respectively, on artificial diets. These results suggest that Colorado potato beetles reared on artificial diets can be used in subsequent tests on foliage without significant carryover effects from either short- or long-term rearing on these diets.

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