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How low can they go when going with the flow? Tolerance of egg and larval fishes to rapid decompression.

Boys CA, Robinson W, Miller B, Pflugrath B, Baumgartner LJ, Navarro A, Brown R, Deng Z - Biol Open (2016)

Bottom Line: Eggs, but not larvae, were unaffected by all levels of decompression tested.At exposure pressures below ∼40 kPa, or ∼40% of surface pressure, swim bladder deflation occurred in all species and internal haemorrhage was observed in one species.Consequently, if larval drift is expected where river infrastructure is present, adopting design or operational features which maintain exposure pressures at 40% or more of the pressure to which drifting larvae are acclimated may afford greater protection for resident fishes.

View Article: PubMed Central - PubMed

Affiliation: New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, New South Wales 2316, Australia craig.boys@dpi.nsw.gov.au.

No MeSH data available.


Related in: MedlinePlus

The percentage of larval Murray cod (top), silver perch (middle) and golden perch (bottom) with internal emphysema at two different ages (days post hatch, DPH) following simulated infrastructure passage over a range of ratio of pressure change (RPC). Piecewise regression lines are not shown because there was no convergence of models.
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BIO017491F3: The percentage of larval Murray cod (top), silver perch (middle) and golden perch (bottom) with internal emphysema at two different ages (days post hatch, DPH) following simulated infrastructure passage over a range of ratio of pressure change (RPC). Piecewise regression lines are not shown because there was no convergence of models.

Mentions: Internal emphysema (see Fig. S1) were observed in many fish including handling controls, however this is not likely to be related to rapid decompression because no significant relationship could be identified for this response and RPC (Fig. 3). In 18-day-old golden perch, internal haemorrhaging was observed with blood pooling in the cavity posterior to the swim bladder (see Fig. S1). Haemorrhaging increased significantly as RPC fell below an estimated threshold of 0.39 (piecewise regression, F=16.5, d.f.=3, 26, P<0.0001; R2=0.66; Fig. 4).Fig. 3.


How low can they go when going with the flow? Tolerance of egg and larval fishes to rapid decompression.

Boys CA, Robinson W, Miller B, Pflugrath B, Baumgartner LJ, Navarro A, Brown R, Deng Z - Biol Open (2016)

The percentage of larval Murray cod (top), silver perch (middle) and golden perch (bottom) with internal emphysema at two different ages (days post hatch, DPH) following simulated infrastructure passage over a range of ratio of pressure change (RPC). Piecewise regression lines are not shown because there was no convergence of models.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4920188&req=5

BIO017491F3: The percentage of larval Murray cod (top), silver perch (middle) and golden perch (bottom) with internal emphysema at two different ages (days post hatch, DPH) following simulated infrastructure passage over a range of ratio of pressure change (RPC). Piecewise regression lines are not shown because there was no convergence of models.
Mentions: Internal emphysema (see Fig. S1) were observed in many fish including handling controls, however this is not likely to be related to rapid decompression because no significant relationship could be identified for this response and RPC (Fig. 3). In 18-day-old golden perch, internal haemorrhaging was observed with blood pooling in the cavity posterior to the swim bladder (see Fig. S1). Haemorrhaging increased significantly as RPC fell below an estimated threshold of 0.39 (piecewise regression, F=16.5, d.f.=3, 26, P<0.0001; R2=0.66; Fig. 4).Fig. 3.

Bottom Line: Eggs, but not larvae, were unaffected by all levels of decompression tested.At exposure pressures below ∼40 kPa, or ∼40% of surface pressure, swim bladder deflation occurred in all species and internal haemorrhage was observed in one species.Consequently, if larval drift is expected where river infrastructure is present, adopting design or operational features which maintain exposure pressures at 40% or more of the pressure to which drifting larvae are acclimated may afford greater protection for resident fishes.

View Article: PubMed Central - PubMed

Affiliation: New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, New South Wales 2316, Australia craig.boys@dpi.nsw.gov.au.

No MeSH data available.


Related in: MedlinePlus