Impact of temperature and nutrient dynamics on growth and survival of Corbicula fluminea : A field study in oligotrophic Lake Constance

2017 ◽  
Vol 102 (1-2) ◽  
pp. 15-28 ◽  
Author(s):  
Timo Basen ◽  
Katja M. Fleckenstein ◽  
Karsten Rinke ◽  
Karl-Otto Rothhaupt ◽  
Dominik Martin-Creuzburg
Keyword(s):  
Field Study ◽  
Nutrient Dynamics ◽  
Corbicula Fluminea ◽  
Oligotrophic Lake ◽  
Lake Constance ◽  
Growth And Survival

scholarly journals A single Thaumarchaeon drives nitrification in deep oligotrophic Lake Constance

2019 ◽  
Vol 22 (1) ◽  
pp. 212-228 ◽  
Author(s):  
Janina Herber ◽  
Franziska Klotz ◽  
Benjamin Frommeyer ◽  
Severin Weis ◽  
Dietmar Straile ◽  
...  
Keyword(s):  
Oligotrophic Lake ◽  
Lake Constance

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).

Population Estimates of Sockeye Salmon (Oncorhynchus nerka) in a Fertilized Oligotrophic Lake

1978 ◽  
Vol 35 (6) ◽  
pp. 851-860 ◽  
Author(s):  
D. G. Robinson ◽  
W. E. Barraclough
Keyword(s):  
Survival Data ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Age Groups ◽  
Close Correlation ◽  
Oligotrophic Lake ◽  
Population Estimates ◽  
Good Resolution ◽  
Growth And Survival ◽  
Carry Over

Pelagic juvenile sockeye salmon (Oncorhynchus nerka) populations were studied in Great Central Lake, British Columbia, during 1969–76 to determine the effect of nutrient enrichment upon their growth and survival. Data for population estimates were collected concurrently by a high-frequency echosounder, and a midwater trawl whose efficiency was inversely related to ambient light above about 1.9 × 10−5 lx. Echogram counts supplemented by trawl catches yielded estimates with low variance, good resolution between age-groups, and indicated close correlation between numbers of spawners and resultant progeny within respective treatments. Survival to the fall for the treated 1969–72 brood years averaged 11.65% (range 11.11–12.81%) of potential egg deposition compared to 3.5% for the pretreatment 1968 brood year fish; 2.73 and 6.29% for the posttreatment 1974 and 1975 brood year fish. A carry-over of fertilization effects on the immediate posttreatment 1973 brood year may have induced a cyclic pattern on the survival of the two succeeding year-classes. The relatively consistent annual production of age 0+ sockeye may be due to the inherent stability of inlake spawning and incubation coupled with the low predation rates. The conservative estimate of a 2.5 increase in survival relative to the natural level indicates a positive response to enhanced feeding conditions caused by the fertilization of this oligotrophic lake. Key words: sockeye, survival, Great Central Lake, fertilization, enhancement, acoustic estimates, townet efficiency

scholarly journals Effects of Feeding Treatments on Growth and Survival of Asian Clam (Corbicula fluminea) in the Hatchery

2021 ◽  
Vol 12 (1) ◽  
pp. 58-65
Author(s):  
Mohd Zharif Ramli ◽  
Amin Ibrahim ◽  
Akrimah Yusoff ◽  
Aweng Eh Rak ◽  
Lee Seong Wei
Keyword(s):  
Survival Rates ◽  
Corbicula Fluminea ◽  
Experimental Period ◽  
Arthrospira Platensis ◽  
Suspension Feeding ◽  
Growth And Survival ◽  
Asian Clam ◽  
Feeding Regimes ◽  
Clam Corbicula ◽  
Feeding Methods

Asian clam (Corbicula fluminea) is potentially reared as aquaculture species but feeding regimes and nutrition for this clam remain questioned. The growth and survival of C. fluminea were evaluated with the assessment of feeding regimes raised in captive rearing treatments (with substrates) fed with spirulina (Arthrospira platensis). Three feeding methods were applied, Treatment A: deposit-feeding, Treatment B: suspension feeding, and Treatment C: combination deposit and suspension-feeding. Shell length (SL) and weight of the individuals were taken every 7 d which last for 6 wk. Condition index (CI), instantaneous growth rates of weight (Kw), and SL (KL) were determined after the experiment ends. Water parameters such as temperature (°C), pH, ammonia (NH4), and dissolved oxygen (DO) also being monitored along the experimental period. Significant weight gained (Kw) and CI was found higher in C. fluminea fed in Treatment C, where the increment was recorded at 6.24x10-3±2.4x10-3gday-1 and 4.34 ±0.3 respectively. Whereas, the increment of SL (KL) was insignificant in all treatments. Survival rates (SR) were greater than 95% in all treatments. The rearing conditions are significant factors that affect the feed utilization for their growth. The growth and survival indicate the specific feeding methods for captive C. fluminea and spirulina feasibility as their feed.

scholarly journals Long term changes in body condition and gillnet selectivity in Lake Constance pelagic spawning whitefish Coregonus wartmanni

2021 ◽  
Author(s):  
Jefferson Tyrell DeWeber ◽  
Roland Rösch ◽  
Jan Baer ◽  
Alexander Brinker
Keyword(s):  
Body Condition ◽  
Fishery Management ◽  
Nutrient Dynamics ◽  
Age Distribution ◽  
The Body ◽  
Lake Constance ◽  
Past Century ◽  
Trophic Conditions ◽  
The Mean ◽  
Pelagic Spawning

The body condition of Lake Constance pelagic spawning whitefish Coregonus wartmanii has changed substantially during the past century and significantly altered the length-based selectivity of gillnets. Linked hierarchical models using Bayesian inference and error propagation were used to estimate the monthly body condition of whitefish from 1932-2018 and condition-dependent gillnet selectivity from 1964-2018. As expected, body condition followed past trends in nutrient dynamics and was highest in summer months. Body condition was clearly linked to gillnet selectivity, with a weight increase of a 300 mm whitefish from 205 to 260 g predicted to reduce the mean (from 374 to 330 mm) and standard deviation (from 30.8 to 25.1) of lengths selected by a 38 mm mesh gillnet. Simulations demonstrate that such changes can reduce the mean age in harvest by over 1 year and greatly bias population age distribution estimates if selectivity changes are ignored. Similar variation in gillnet selectivity is expected where trophic conditions or other factors cause body condition differences, and accounting for these changes could reduce biases to inform fishery management.

Sign in / Sign up

Export Citation Format

Share Document