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Family: | Petromyzontidae Northern lampreys | |||||||||||||||||||||||||||
Max. length (Lmax): | = cm | |||||||||||||||||||||||||||
L infinity (Linf): |
=
s.e.
-
cm
Estimated from max. length. |
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L maturity (Lm): |
s.e.
-
cm
Estimated from Linf. Maturity data |
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L max. yield (Lopt): |
s.e.
-
cm
Estimated from Linf. |
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K: |
/year
Lm = cm
tm = years
Estimated from Linf, Lm, to and tm. |
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to: | years Estimated from Linf and K. | |||||||||||||||||||||||||||
Natural mortality (M): |
s.e.
-
/year
Estimated from Linf., K and annual mean temp. = °C |
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Life span (approx.): | s.e. - years Estimated from Linf., K and to. Max. age & size data | |||||||||||||||||||||||||||
Generation time: | Estimated from Lopt, Linf., K and to. | |||||||||||||||||||||||||||
Age at first maturity (tm): | s.e. - years Estimated from Lm, Linf., K and to. | |||||||||||||||||||||||||||
Relative Yield per Recruit (Y'/R): |
Estimate Y'/R from M/K, Lc/Linf and E. Lc = cm E = /year Emsy /year Eopt /year Fmsy /year Fopt /year |
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Exploitation: |
Z= F= E= |
Estimate Z, F, E from Lc, Lmean, Linf, K, M
Lc = cm Lmean = cm |
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Resilience / productivity: |
Vulnerable to extinction if decline in biomass or numbers exceeds threshold over the longer of 10 years or 3 generations. |
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Intrinsic rate of increase (rm): | /year |
Lr = cm
Estimated from Fmsy at Lc = length of recruitment (Lr). |
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Main food: | ||||||||||||||||||||||||||||
Trophic level: | 0.0 Estimated from Ecopath model. | |||||||||||||||||||||||||||
Food consumption (Q/B): | times the body weight per year |
Enter Winf, temperature, aspect ratio (A), and food type to estimate Q/B Winf = g Temp. = °C
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Estimate growth | ||||||||||||||||||||||||||||
Note: The estimates are derived from default values taken from FishBase and will thus not be appropriate for every population. You can change these values and recalculate the life history parameters. |
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