scholarly journals Erratum to: The effects of cold shock on freshwater fish larvae and early-stage juveniles: implications for river management

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Laura E Michie ◽  
Jason D Thiem ◽  
Craig A Boys ◽  
Simon M Mitrovic
Keyword(s):  
Freshwater Fish ◽  
Cold Shock ◽  
Fish Larvae ◽  
Early Stage ◽  
River Management

scholarly journals The effects of cold shock on freshwater fish larvae and early-stage juveniles: implications for river management

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Laura E Michie ◽  
Jason D Thiem ◽  
Craig A Boys ◽  
Simon M Mitrovic
Keyword(s):  
Freshwater Fish ◽  
Cold Shock ◽  
Fish Larvae ◽  
Early Stage ◽  
Age Groups ◽  
Freshwater Ecosystems ◽  
Fish Populations ◽  
Swimming Ability ◽  
Temperature Changes ◽  
Rapid Temperature

Abstract Temperature is essential to the maintenance of optimal physiological functioning in aquatic organisms. Fish can manage natural fluctuations in temperature; however, in freshwater ecosystems acute and rapid temperature changes can originate from sources such as large dams and industrial effluents. These rapid temperature changes may induce several physiological and behavioural responses that can result in lethal and sub-lethal consequences. The present study assessed immediate sub-lethal and short-term (10 days) lethal responses of three species of Australian freshwater fish larvae and early-stage juveniles to a range of different ‘field-relevant’ cold shocks (−4, −6, −8 and −10°C). Murray cod (Maccullochella peelii), silver perch (Bidyanus bidyanus) and golden perch (Macquaria ambigua) were tested at two age groups to elucidate the interaction between ontogeny and sensitivity to cold shock. Cold shock caused mortality and reductions in swimming ability (time to exhaustion and lines crossed) in all species of fish at both age groups. Sensitivity was correlated to the magnitude of cold shock; a 10°C drop in temperature caused the highest mortalities. Ontogeny interacted with the severity of cold shock; the younger fish experienced higher mortalities and greater impairment to swimming ability. This study demonstrates the potential lethal and sub-lethal impacts of cold shock on freshwater fish at a critical life-history stage. Understanding the impacts of cold shock will aid management of freshwater ecosystems for the benefit of fish populations, with the current study identifying critical life stages to be considered in remediation and guiding thresholds necessary to reduce the impact of cold shock on native fish populations.

Temporal patterns in distributions of tropical fish larvae on the North West Shelf of Australia

2004 ◽  
Vol 55 (5) ◽  
pp. 473 ◽  
Author(s):  
A. Sampey ◽  
M. G. Meekan ◽  
J. H. Carleton ◽  
A. D. McKinnon ◽  
M. I. McCormick
Keyword(s):  
Southern Oscillation ◽  
Fish Larvae ◽  
Early Stage ◽  
Larval Survival ◽  
Zooplankton Biomass ◽  
Tropical Fish ◽  
North West ◽  
Larval Fishes ◽  
The North ◽  
Abundance And Diversity

Information on the temporal distributions of tropical fish larvae is scarce. Early stage larval fishes were sampled using towed bongo plankton nets at sites on the southern North West Shelf of Australia (21°49′S, 114°14′E), between October and February of 1997/98 and 1998/99. The first summer was characterised by El Niño–Southern Oscillation-driven upwelling and high primary productivity, whereas in the second summer water temperatures were warmer and primary production was lower. Benthic percoid shorefishes dominated surface assemblages in both summers and this pattern may be typical of tropical shelf environments.The abundance and diversity of larval fishes were lowest in October and increased from November through to February. Assemblages displayed weak cross-shelf patterns, with a few taxa being more abundant at inshore sites (e.g. monacanthids), whereas others were more abundant offshore (e.g. scombrids). Although the composition of assemblages remained relatively consistent, many taxa (e.g. pomacentrids and carangids) showed differences in abundance between summers. Multivariate analyses found no relationships between abundance patterns of larval fishes and biophysical variables, such as temperature, salinity, and zooplankton biomass. Thus, seasonal changes in abundance may reflect differences in the spawning activities of adult fishes and/or larval survival.

scholarly journals Recombinant cold shock domain containing protein is a potential antigen to detect specific antibody during early and late infections of Haemonchus contortus in goat

2020 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
KaLiBiXiaTi Aimulajiang ◽  
Muhammad Ali Memon ◽  
Muhammad Waqqas Hasan ◽  
Sana Zahra Naqvi ◽  
...  
Keyword(s):  
Haemonchus Contortus ◽  
Cold Shock ◽  
Fasciola Hepatica ◽  
Trichinella Spiralis ◽  
Early Stage ◽  
Cross Reactivity ◽  
Antibody Detection ◽  
Economic Losses ◽  
Diagnostic Potential ◽  
Specificity And Sensitivity

Abstract Background : Haemonchus contortus ( H. contortus ) is one of the most important parasites that cause huge economic losses to small ruminant industry worldwide. Effective prognosis and treatment depend upon the early diagnosis of H. contortus infection. To date, no widely-approved methods for the identification of prepatent H. contortus infection are available to identify prepatent H. contortus infection. The aim of this study was to evaluate the diagnostic potential of recombinant cold shock H. contortus protein (rHc-CS) during early and late infections of H. contortus in goat. Results : Purified rHc-CS exhibited a clear band, with a molecular weight about 38 kDa. H. contortus eggs were not detected by fecal egg count technique from feces collected at 0 to 14 days post infection (D.P.I). However, eggs were detected at 21, 28 and 35 D.P.I. Hence, results of immunoblotting assay showed specific anti rHc-CS antibody detection in all goat sera collected at early stage (14 D.P.I) and late stage (21-103 D.P.I) of H. contortus infection. Furthermore, no cross reactivity was observed against Trichinella spiralis , Fasciola hepatica and Toxoplasma gondii or uninfected goats. Among several evaluated rHc-CS indirect-ELISA format variables, favorable antigen coating concentration was found 0.28μg/well at 37℃ 1h and overnight at 4°C. Moreover, optimum dilution ratio of serum and rabbit anti-goat IgG was recorded as 1:100 and 1:4000, respectively. The best blocking buffer was 5% Bovine Serum Albumin (BSA) while the best time for blocking, serum incubation and TMB reaction were recorded as 60, 120 and 10 min, respectively. The cut-off value for positive and negative interpretation was determined as 0.352 (OD 450 ). The diagnostic specificity and sensitivity of the rHc-CS, both were recorded as 100%. Conclusion : These results validated that rHc-CS is a potential immunodiagnostic antigen to detect the specific antibodies during early and late H. contortus infections in goat.

Distribution of fish larvae within a weakly tidal mangrove lagoon

2017 ◽  
Vol 68 (2) ◽  
pp. 396
Author(s):  
J. Jaxion-Harm ◽  
M. R. Speight
Keyword(s):  
Dna Analysis ◽  
Full Moon ◽  
Hydrodynamic Force ◽  
Fish Larvae ◽  
Early Stage ◽  
Shallow Waters ◽  
Light Traps ◽  
Larval Distribution ◽  
New Moon ◽  
Distribution Of Fish

Mangroves have been shown to provide valuable nursery grounds to juvenile fishes, yet little is known regarding larval distribution and settlement processes in this habitat. To investigate fish larvae in mangrove habitat in a semi-isolated lagoon (surface area 750m2), we employed multiple catch methods: plankton tows, minnow traps, and light traps during June–August 2008 and 2009. Overall, nine families of fish larvae were caught in the light traps. Light traps caught significantly more fish larvae during the new moon compared with the full moon. Plankton tow nets caught early-stage, unidentifiable (without DNA analysis) larvae. Minnow traps only caught a total of three fish larvae. Overall, scarids (parrotfish) and lutjanids (snappers) were the most common larvae from coral-reef fish families and were found at sites over 1km upstream of the mouth of the mangrove lagoon. Without the aid of tidal influence (and nets requiring hydrodynamic force), sampling is difficult in these turbid, shallow waters.

scholarly journals Feeding selectivity of early-stage fish larvae on the nauplii and eggs of different copepod species

2017 ◽  
Vol 12 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Aiko Mitsuzawa ◽  
Hiroyuki Miyamoto ◽  
Hiroshi Ueda
Keyword(s):  
Fish Larvae ◽  
Early Stage ◽  
Copepod Species ◽  
Feeding Selectivity

Changes in Behaviour of Atlantic Halibut (Hippoglossus hippoglossus) and Turbot (Scophthalmus maximus) Yolk-Sac Larvae Induced by Bacterial Infections

1993 ◽  
Vol 50 (12) ◽  
pp. 2552-2557 ◽  
Author(s):  
Anne Berit Skiftesvik ◽  
Øivind Bergh
Keyword(s):  
Bacterial Infections ◽  
Fish Larvae ◽  
Early Stage ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Atlantic Halibut ◽  
Hippoglossus Hippoglossus ◽  
Pathogenic Vibrio ◽  
Turbot Scophthalmus Maximus ◽  
Reduced Activity

Eggs of Atlantic halibut (Hippoglossus hippoglossus) and turbot (Scophthalmus maximus) were exposed to Flexibacter ovolyticus and pathogenic Vibrio sp. strains prior to, and during hatching. Activity, buoyancy and mortality of the yolk sac larvae were monitored from hatching until time of first feeding. The halibut larvae showed reduced activity and increased mortality in response to the challenge of bacteria, compared to uninfected control groups. In addition, the infected halibut larvae showed increased specific density compared to the uninfected larvae. These responses were not found for turbot. However, turbot larvae infected with Vibrio anguillarum had lower activity than larvae infected with F. ovolyticus. The reduced activity of halibut larvae occurred 1–2 weeks prior to the increased mortality, allowing infections to be detected at an early stage. The results suggest that the behaviour of fish larvae is influenced by bacterial infection.

scholarly journals eDNA metabarcoding of small plankton samples to detect fish larvae and their preys from Atlantic and Pacific waters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Eva Garcia-Vazquez ◽  
Oriane Georges ◽  
Sara Fernandez ◽  
Alba Ardura
Keyword(s):  
High Throughput Sequencing ◽  
Fish Larvae ◽  
Early Stage ◽  
Zooplankton Community ◽  
Coi Gene ◽  
Fish Diet ◽  
Commercial Fish ◽  
Tropical Waters ◽  
Small Water ◽  
Sampling Protocols

AbstractZooplankton community inventories are the basis of fisheries management for containing fish larvae and their preys; however, the visual identification of early-stage larvae (the “missing biomass”) is difficult and laborious. Here, eDNA metabarcoding was employed to detect zooplankton species of interest for fisheries from open and coastal waters. High-Throughput sequencing (HTS) from environmental samples using small water volumes has been proposed to detect species of interest whose DNA is the most abundant. We analyzed 6-L water samples taken from subtropical and tropical waters using Cytochrome oxidase I (COI) gene as metabarcode. In the open ocean, several commercial fish larvae and invertebrate species important in fish diet were found from metabarcodes and confirmed from individual barcoding. Comparing Atlantic, Mediterranean, Red Sea, and Pacific samples we found a lower taxonomic depth of OTU assignments in samples from tropical waters than in those from temperate ones, suggesting large gaps in reference databases for those areas; thus a higher effort of zooplankton barcoding in tropical oceans is highly recommended. This and similar simplified sampling protocols could be applied in early detection of species important for fisheries.

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