scholarly journals The early catfish catches the worm: predation of Corydoras aeneus (Siluriformes, Callichthyidae) on freshwater nematodes

2018 ◽  
Vol 54 ◽  
pp. 29 ◽  
Author(s):  
Nabil Majdi ◽  
Sebastian Weber ◽  
Walter Traunspurger
Keyword(s):  
Nematode Species ◽  
Ornamental Fish ◽  
Live Food ◽  
Daily Consumption ◽  
Freshwater Catfish ◽  
Freshwater Nematodes ◽  
Panagrellus Redivivus ◽  
Wet Weight

In this study, we measured the daily consumption of four different nematode species by a small freshwater catfish species, Corydoras aeneus (Gill, 1858). Consumption of nematodes by fishes was significant with a single C. aeneus individual being able to consume in 24 h between 40 581 and 75 849 adult nematodes depending on the nematode species offered. This represented the ingestion of up to 238 mg wet weight when considering the largest nematode species: Panagrellus redivivus. Our results strengthen the growing evidence of a significant trophic channel existing between meiobenthic invertebrates like nematodes and small bottom-feeding fishes like C. aeneus. We also discuss the relevance of using P. redivivus as live food for rearing C. aeneus which is a popular ornamental fish.

The demise of the Platonic worm

Nematology ◽  
2000 ◽  
Vol 2 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Armand Leroi ◽  
Scott Emmons ◽  
Ana Cunha ◽  
Ricardo B.R. Azevedo
Keyword(s):  
Caenorhabditis Elegans ◽  
Nematode Species ◽  
Cell Number ◽  
Cell Lineages ◽  
Panagrellus Redivivus ◽  
Seam Cell ◽  
Nous Montrons ◽  
Adult Cell ◽  
Free Living Nematode ◽  
Nuclear Number

AbstractNematodes are generally considered to have an adult cell number that does not vary among wildtype individuals as a consequence of invariant cell lineages (eutely). However, there is extensive evidence that at least some cell lineages can be variable in nematodes. In a comparative study of 13 free-living nematode species, we have shown that the adult epidermis of most species contained variable numbers of nuclei and that this variance was positively correlated with mean epidermal nuclear number. Here we present simulations of the lateral seam cell lineages of four species and show that variance in cell number is influenced by lineage topology, as well as by the frequency of lineage variants. We show that the epidermal variability of Panagrellus redivivus cannot be accounted for by the complexity of its lineage, but requires higher levels of lineage variability than are found in Caenorhabditis elegans, Oscheius myriophila and Rhabditella octopleura. Our findings suggest that many nematodes may have tissues composed of indeterminate numbers of cells formed from variable lineages and, as such, resemble other metazoans. Les nématodes sont généralement considérés comme ayant un nombre de cellules invariable chez les individus de type sauvage, conséquence d’un lignage cellulaire fixe (eutélie). Cependant, il est d’évidence qu’au moins certains des lignages cellulaires peuvent varier chez les nématodes. Dans une étude comparative portant sur 13 espèces de nématodes libres, nous avions montré que l’épiderme de la plupart de ces espèces comportait un nombre variable de noyaux et que cette variabilité était corrélée positivement avec le nombre de noyaux épidermiques. Nous présentons ici des simulations des lignages cellulaires de la suture latérale de quatre espèces et démontrons que le nombre de cellules est influencé tant par la topologie du lignage que par la fréquence des variants de ce lignage. Nous montrons que la variabilité de l’épiderme de Panagrellus redivivus ne peut être mise au compte de la complexité de son lignage, mais demande des niveaux élevés de variabilité de ce lignage, tels ceux trouvés chez Caenorhabditis elegans, Oscheius myriophila et Rhabditella octopleura. Nos observations suggèrent que nombre de nématodes possèdent des tissus composés d’un nombre indéterminé de cellules dérivant de lignages variables et, de ce fait, ressemblent aux autres metazoaires.

Freshwater nematodes as bioindicators in field studies - the NemaSPEAR[%]-index.

2021 ◽  
pp. 323-340
Author(s):  
Sebastian Höss ◽  
Walter Traunspurger
Keyword(s):  
Ecological Status ◽  
Nematode Species ◽  
Field Studies ◽  
Freshwater Ecosystems ◽  
Freshwater Nematodes ◽  
Chemically Induced ◽  
Freshwater Habitats ◽  
Induced Changes ◽  
Quality Assessments

Abstract This chapter, after a general introduction to quality assessments of freshwater habitats, reviews the use of freshwater nematodes as in situ bioindicators, including in monitoring the ecological quality of freshwater habitats. By drawing on studies of nematode communities in unpolluted and polluted habitats as examples, it highlights both the different methods used to assess the quality of freshwater ecosystems and their applications. A focus of the chapter is the development of a new index that uses freshwater nematodes to assess chemically induced changes in the ecological status of freshwater habitats, the NemaSPEAR[%]-index (Nematode SPEcies At Risk).

scholarly journals Breeding development of Amazon killifish Anablepsoides sp from Pastaza basin high lands, with Panagrellus redivivus live food, in captivity

2019 ◽  
Author(s):  
Carlos Andrés Silva-Aldas ◽  
Annette Milena Villalta-Gordillo ◽  
Jocelyn Estefanía Arias-Naranjo ◽  
Ricardo Burgos-Morán
Keyword(s):  
Live Food ◽  
Panagrellus Redivivus ◽  
In Captivity

Free-living nematode communities in a large and deep oligotrophic lake in Europe: comparison of different depth zones of Lake Constance (Germany)

Nematology ◽  
2020 ◽  
Vol 23 (1) ◽  
pp. 69-87
Author(s):  
Walter Traunspurger ◽  
André Witthöft-Mühlmann ◽  
Sebastian Höss
Keyword(s):  
Species Richness ◽  
Water Depth ◽  
C:N Ratio ◽  
Clay Content ◽  
Nematode Species ◽  
Oligotrophic Lake ◽  
Lake Constance ◽  
Free Living ◽  
Nematode Communities ◽  
Wet Weight

Summary This study investigated the abundance, biomass, species richness, species distribution and feeding types of free-living nematodes in Lake Constance, a deep, oligotrophic lake in Germany. Three water depth zones, the sublittoral (13-30 m water depth), profundal (31-99 m) and deep profundal (100-250 m), were distinguished and 16 sites from each water depth zone were sampled. A high nematode species richness was determined at all three zones, with 129 species in the sublittoral, 113 in the profundal and 92 in the deep profundal. In total, 171 nematode species were identified in this study. The dominant species (relative abundance > 5%) in all water depths were Ethmolaimus pratensis, Eumonhystera filiformis, E. longicaudatula, E. vulgaris and E. andrassyi, Hofmaenneria brachystoma, Ironus tenuicaudatus, Monhystera paludicola/stagnalis, Prismatolaimus intermedius and Tobrilus gracilis. High mean densities of 507-730 indiv. 10 cm−2 were found at each water depth, with a mean overall density of 627 indiv. 10 cm−2. The high abundance resulted in a high mean biomass (1.19 mg wet weight 10 cm−2; range 0.92-1.37 mg wet weight 10 cm−2) for nematodes in Lake Constance. Deposit feeders were the dominant feeding type at all water depth zones (51.7%), followed by epistrate feeders (17.6%), chewers-omnivores (15.9%) and chewers-predators (11.0%). Suction feeders accounted for <4% in the lake as a whole. The structure of the nematode communities in the three zones correlated with sediment texture (water content, clay content), as well as total sulphur and nutrient-related parameters (ATP, bacteria, algae, C:N ratio).

Panagrellus redivivus mass produced on solid media as live food for Litopenaeus vannamei larvae

2006 ◽  
Vol 37 (14) ◽  
pp. 1429-1436 ◽  
Author(s):  
Ulfert Focken ◽  
Christian Schlechtriem ◽  
Matthias von Wuthenau ◽  
Armando García-Ortega ◽  
Ana Puello-Cruz ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Live Food ◽  
Solid Media ◽  
Panagrellus Redivivus

Mass produced nematodes Panagrellus redivivus as live food for rearing carp larvae: preliminary results

2004 ◽  
Vol 35 (6) ◽  
pp. 547-551 ◽  
Author(s):  
Christian Schlechtriem ◽  
Manuele Ricci ◽  
Ulfert Focken ◽  
Klaus Becker
Keyword(s):  
Live Food ◽  
Preliminary Results ◽  
Panagrellus Redivivus

scholarly journals Food Consumption and Growth Rates of Juvenile Black Carp Fed Natural and Prepared Feeds

2014 ◽  
Vol 5 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Nathaniel C. Hodgins ◽  
Harold L. Schramm ◽  
Patrick D. Gerard
Keyword(s):  
Food Consumption ◽  
Growth Rates ◽  
Specific Growth ◽  
Daily Consumption ◽  
Black Carp ◽  
Consumption Rates ◽  
Wet Weight ◽  
Feeding Trials ◽  
Specific Growth Rates ◽  
Weight Number

Abstract The introduced mollusciphagic black carp Mylopharyngodon piceus poses a significant threat to native mollusks in temperate waters throughout the northern hemisphere, but consumption rates necessary to estimate the magnitude of impact on mollusks have not been established. We measured food consumption and growth rates for small (77–245 g) and large (466–1,071 g) triploid black carp held individually under laboratory conditions at 20, 25, and 30°C. Daily consumption rates (g food · g wet weight fish−1·d−1·100) of black carp that received prepared feed increased with temperature (small black carp 1.39–1.71; large black carp 1.28–2.10), but temperature-related increases in specific growth rate (100[ln(final weight) - ln(initial weight)]/number of days) only occurred for the large black carp (small black carp −0.02 to 0.19; large black carp 0.16–0.65). Neither daily consumption rates (5.90–6.28) nor specific growth rates (0.05–0.24) differed among temperatures for small black carp fed live snails. The results of these laboratory feeding trials indicate food consumption rates can vary from 289.9 to 349.5 J·g−1·d−1 for 150 g black carp receiving prepared feed, from 268.8 to 441.0 J·g−1·d−1for 800 g black carp receiving prepared feed, and from 84.8 to 90.2 J·g−1·d−1 for 150 g black carp that feed on snails. Applying estimated daily consumption rates to estimated biomass of native mollusks indicates that a relatively low biomass of black carp could eliminate native snails and substantially reduce recruitment of mussels in time periods as short as 180 d.

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