Values shown below are defaults; and K is an estimate from the Family where the species belongs. Please double-check, replace with better values as appropriate, and 'Recalculate'.

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Life History Data on Trimma helenae
Helen's pygmygoby

Family:

Gobiidae Gobies

Max. length (Lmax):

= cm

L infinity (Linf):

= s.e. - cm

L maturity (Lm):

s.e. - cm
Estimated from Linf.

L max. yield (Lopt):

s.e. - cm
Estimated from Linf.

/year

Estimate K from Linf, Lm and tm:
Lm = cm
tm = years

Estimate K from Linf and tmax:
tmax = years

Enter Linf and K:
Linf = cm
K = /year

to:

years Estimated from Linf and K.

Natural mortality (M):

s.e. - /year
°C

Life span (approx.):

s.e. - years Estimated from Linf., K and to.

Generation time:

s.e. - years 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

Exploitation:

Z=
F=
E=

Estimate Z, F, E from Lc, Lmean, Linf, K, M
Lc = cm
Lmean = cm

Resilience / productivity:

Vulnerable to extinction if decline in biomass or numbers exceeds threshold over the longer of 10 years or 3 generations.

Intrinsic rate of increase (rm):

/year

Lr = cm
Estimated from Fmsy at Lc = length of recruitment (Lr).

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

A =

Detrivore	Herbivore	Omnivore	Carnivore

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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Species summary

Life History Data created by: Eli, 01.06.99, php script by: kbanasihan, 11.02.10, last modified by kbanasihan, 11.11.10

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