Effect of Intermittent Traveling Water Screen Operation on Fish Survival

The objective of this study was to investigate the effect of density, duration and the use of additives to the water during the transportation of juvenile tambaqui (Colossoma macropomum) and use of this data to establish a safe transportation protocol for the species. The tested products and dosages were: salt (1000, 2000 and 3000 mg/L), gypsum (100, 300 and 500 mg/L) and benzocaine (10, 20 and 30 mg/L). Fish were transported in closed systems (plastic bag) at different densities and time periods of up to 24 h. Fish survival (FS) and water quality parameters were monitored immediately after transportation. The remaining fish were kept in floating cages in order to evaluate mortality which occurred up to 96 h after transportation (S96). The best fish density, additives dosages and time period of the transportation was estimated with a general linear model. The effect of the condition factor on FS and S96 was also evaluated. As expected, FS and S96 were significantly related to time and density. FS but not S96, were also were significantly related to treatment. FS with gypsum treatment was not different from controls and FS with table salt and benzocaine treatments were significantly reduced. The condition factor was not related to either FS or S96. FS was inversely correlated with carbon dioxide concentration. It was concluded that the additives did not improve fish transportation survival. Linear models were developed to predict the best transportation densities as a function of time.

Download Full-text

Effect of forecast skill on management of the Oregon coast coho salmon (Oncorhynchus kisutch) fishery

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2012-040 ◽

2012 ◽

Vol 69 (6) ◽

pp. 1016-1032 ◽

Cited By ~ 5

Author(s):

David E. Rupp ◽

Thomas C. Wainwright ◽

Peter W. Lawson

Keyword(s):

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Status Quo ◽

Forecast Skill ◽

Oregon Coast ◽

Performance Metric ◽

Specific Performance ◽

The Status ◽

Target Performance ◽

Fish Survival

Better fisheries management is often given as one justification for research on improving forecasts of fish survival. However, the value gained from expected improvements in forecast skill in terms of achieving management goals is rarely quantified as part of research objectives. Using Monte Carlo simulations of population dynamics, we assessed the effect of forecast skill under two strategies for managing Oregon coast natural (OCN) coho salmon ( Oncorhynchus kisutch ). The first, or status quo, strategy is currently being used to rebuild threatened OCN coho populations. This strategy determines harvest based on both a forecasted marine survival rate and parental spawner abundance. The second strategy relies on a forecast of preharvest adult abundance to achieve a constant spawner escapement target. Performance of the status quo strategy was largely insensitive to forecast skill, while the second strategy showed sensitivity that varied with escapement target and specific performance metric. The results imply that effort towards improving forecasts is not justifiable solely on the basis of improved management under the status quo strategy, though it may be were the management strategy altered.

Download Full-text

Factors driving temporospatial heterogeneity of fish community health in Jinan City, China

Marine and Freshwater Research ◽

10.1071/mf18337 ◽

2019 ◽

Vol 70 (5) ◽

pp. 637 ◽

Cited By ~ 2

Author(s):

C. S. Zhao ◽

Y. Yang ◽

S. Yang ◽

Y. Gai ◽

C. Zhang ◽

...

Keyword(s):

Water Quality ◽

Fish Community ◽

Oxygen Demand ◽

Physical Factor ◽

Field Trips ◽

Driving Factors ◽

Chemical Factor ◽

River Health ◽

Jinan City ◽

Fish Survival

Jinan City is the first pilot city for the construction of a hydroecological civilisation in China. Fifty-eight representative river sampling stations were selected through field trips and surveys, and fish were sampled in the spring, summer, and autumn of 2015. An index of fish biological integrity in Jinan City was constructed and to evaluate the hydroecological health of rivers. Canonical correlation analysis was used to select key driving factors that affect the health of the fish community. The results show that the key physical factor affecting water quality was turbidity, the key chemical factor affecting water quality was chemical oxygen demand (COD) and the key hydrological factor affecting water quality was discharge. Of all the driving factors, COD had the greatest effect on the health of the fish community, followed by discharge and turbidity. Macropodus chinensis Bloch was sensitive to changes in COD; Saurogobio dumerili Bleeker and Pseudolaubuca engraulis Nichols were sensitive to the hydrological factors of discharge and flow velocity; and Saurogobio gymnocheilus Lo and Squaliobarbus ourriculus Richardson were sensitive only to discharge. COD and discharge had a strong effect on fish survival, whereas turbidity affected fish survival but was not a major factor affecting the spatial distribution of river health. The findings can provide a reference for aquatic ecological rehabilitation in developing countries.

Download Full-text

Defective sarcomere organization and reduced larval locomotion and fish survival in slow muscle heavy chain 1 ( smyhc1 ) mutants

The FASEB Journal ◽

10.1096/fj.201900935rr ◽

2019 ◽

Vol 34 (1) ◽

pp. 1378-1397

Author(s):

Siping Li ◽

Haishen Wen ◽

Shaojun Du

Keyword(s):

Heavy Chain ◽

Slow Muscle ◽

Fish Survival

Download Full-text

Swim Bladder Disorders in Koi Carp (Cyprinus carpio)

Animals ◽

10.3390/ani10111974 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1974

Author(s):

Rubina Sirri ◽

Luciana Mandrioli ◽

Samuele Zamparo ◽

Francesca Errani ◽

Enrico Volpe ◽

...

Keyword(s):

Medical Intervention ◽

Clinical Approach ◽

Swim Bladder ◽

Pharmacological Management ◽

Koi Carp ◽

Antimicrobial Susceptibility Pattern ◽

Bladder Disorders ◽

Fish Survival ◽

Gross Examination

Swim bladder disorders and consequent buoyancy problems are encountered in ornamental fish, including koi carp. Nevertheless, beyond clinical and pharmacological management, they are largely underdiagnosed. In this study, nine koi carp showing abdominal swelling and abnormal swimming behavior were investigated. Clinical approach, varying from case to case, included ultrasonographic and X-ray investigations, bacteriological analysis of the collected fluid, antimicrobial susceptibility pattern, and possibly histological analysis. Diagnostic imaging, corroborating gross examination, documented swim bladder deformation/dislocation and serous fluid within the swim bladder chambers of most animals. Bacteria belonging to the Aeromonas hydrophila/caviae group and Shewanella xiamenensis were identified. S. xiamenensis strains showed a sensibility to all tested molecules except for one strain, which was resistant to tetracycline and cyprofloxacin. Antibiotic treatment succeeded in the full recovery of three cases in which S. xiamemensis infection was detected. Chronic aerocystitis was histologically documented where tissue was available. The swim bladder histopathological findings highlighted a chronic process that had compromised the quality of life of the animals. A multidisciplinary clinical–pathological and microbiological approach is highly suggested to recognize swim bladder conditions as early as possible, aiming to drive medical intervention and raising the chances of fish survival.

Download Full-text