Effect of fish density and number of infectious fish on the survival of rainbow trout fry, <i>Oncorhynchus mykiss</i> (Walbaum), during epidemics of infectious pancreatic necrosis

Bebak-Williams, Julie; McAllister, P.E.; Smith, Graham C.; Boston, Ray

doi:10.1046/j.1365-2761.2002.00426.x

Cited by 33 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Turnbull & Mitchell 1984) but has only been used sparingly in fish health investigations (Dale et al 1997, Park & Reno 2003, Ogut & Reno 2004, Becker et al 2006. Bebak-Williams et al (2002) applied survival analysis to examine the influence of stocking density and pathogen concentration on survival of rainbow trout Oncorhynchus mykiss experimentally challenged with infectious pancreatic necrosis (IPN) virus. The authors used the Kaplan-Meier model to examine changes in risk over time associated with IPN outbreaks.…”

Section: Discussionmentioning

confidence: 99%

Influence of nutritional state on the progression and severity of mycobacteriosis in striped bass Morone saxatilis

Jacobs¹,

Rhodes²,

Baya³

et al. 2009

Dis. Aquat. Org.

View full text Add to dashboard Cite

Challenge studies with Mycobacterium marinum clearly demonstrate that a poor diet affects the progression and severity of mycobacteriosis in striped bass Morone saxatilis. Fish (n = 512 total, wt = 65 ± 15 g) were inoculated intraperitoneally with 10 4 colony-forming units (CFU) g -1 body weigth (BW) or a physiological saline solution (controls) and evaluated for 8 mo. Inoculated fish fed a low-ration diet (0.15% BW d -1 ) developed a severe, systemic infection characterized by a high bacterial load (>10 8 CFU g -1 spleen) and poor granuloma formation, which commonly progressed to mortality by 6 wk. In contrast, inoculated fish fed an adequate ration diet (1% BW d -1 ) developed classic granulomatous inflammation of reduced severity and total body energy similar to that found in uninoculated controls (p > 0.05). After 4 wk, fish fed adequate rations maintained an equilibrium state throughout the study period, even though 10 6 CFU g -1 spleen mycobacteria were consistently cultured. In a second study, reactivation of an acute inflammatory state was demonstrated by placing previously infected fish on reducing diets (0.073% BW d -1). In both studies, the energetic demand of this disease was only appreciable when associated with active, severe, inflammatory states. To our knowledge, this study is the first to demonstrate the interaction of diet and mycobacteriosis in fish.

show abstract

Section: Discussionmentioning

confidence: 99%

Influence of nutritional state on the progression and severity of mycobacteriosis in striped bass Morone saxatilis

Jacobs¹,

Rhodes²,

Baya³

et al. 2009

Dis. Aquat. Org.

View full text Add to dashboard Cite

show abstract

“…Survival analysis is a relatively new and useful tool used in the analysis of diseasetransmission models in fish research (Bebak-Williams et al 2002, Becker et al 2002, Ramsay et al 2003. These statistical procedures are used for the analysis of data in which the outcome variable of interest is time until an event occurs, with the event defined as any designated experience (e.g.…”

Section: Methodsmentioning

confidence: 99%

Impact of a water temperature shift on xenoma clearance and recovery time during a Loma salmonae (Microsporidia) infection in rainbow trout Oncorhynchus mykiss

Becker

2004

Dis. Aquat. Org.

View full text Add to dashboard Cite

Previous studies have modelled the relationship between water temperature and the rate of sporulation as defined by xenoma formation during microsporidial gill disease (MGD) in salmon caused by Loma salmonae. Although offering insight into the epidemiology of MGD, a key unexplored area is the role of temperature in the rate of xenoma dissolution including spore release into the environment, and this is crucial to our ability to model horizontal transmission of MGD within confined net-pen populations of farmed salmon. Results from a previous trial suggested that xenoma dissolution may be dramatically hastened as water temperature declines, thus introducing a critical anomaly into any predictive exercise. The data generated herein was evaluated using the statistics of survival analysis to re-establish the baseline relationship of xenoma formation and dissolution relative to water temperature and to compare these results with those of previous studies. We infected 30 individuals of Oncorhynchus mykiss (Walbaum) with macerated xenoma-laden gill material, and afterwards allocated them to tanks with water temperatures of 11, 15, or 19°C and monitored them through a disease cycle. Xenoma onset and clearance times were similar to previous findings with both events being accelerated at higher water temperatures, thereby suggesting a similar temperature response in the current strain to those used in previous studies. Another group of 45 fish was infected with L. salmonae and held at 15°C until xenomas formed, and were subsequently shifted to 11, 15, or 19°C. The median xenoma dissolution time in these tanks was 49, 35 and 28 d, respectively, similar to rates observed when water temperature remained constant. Thus we rejected the hypothesis that a sudden change in water temperature triggers rapid or anomalous xenoma dissolution.

show abstract

“…decreases hematocrit, hemoglobin, total protein in plasma, number of immature erythrocytes and neutrophilus (Khan et al, 1981). Factors infl uencing the colonization of bacteria on fi ns are frequency and rate of tissue damage, water temperature (Turnbull et al, 1998) and fi sh stock size (Mazur et al, 1993;Bebak-Williams et al, 2002). Schneider and Nicholson (1980) found that there is an increasing frequency of bacterial infection occurrance according to decreasing temperature.…”

Section: Bacterial Infectionsmentioning

confidence: 99%

Fin condition of fish kept in aquacultural systems

Klíma¹,

Kopp²,

Hadašová³

et al. 2013

Acta Univ. Agric. Silvic. Mendelianae Brun.

View full text Add to dashboard Cite

show abstract

Effect of fish density and number of infectious fish on the survival of rainbow trout fry, Oncorhynchus mykiss (Walbaum), during epidemics of infectious pancreatic necrosis

Cited by 33 publications

References 13 publications

Influence of nutritional state on the progression and severity of mycobacteriosis in striped bass Morone saxatilis

Influence of nutritional state on the progression and severity of mycobacteriosis in striped bass Morone saxatilis

Impact of a water temperature shift on xenoma clearance and recovery time during a Loma salmonae (Microsporidia) infection in rainbow trout Oncorhynchus mykiss

Fin condition of fish kept in aquacultural systems

Contact Info

Product

Resources

About