Can the age of a fish be estimated from the stage of gonad maturity?

It is assumed that younger fish are sexually immature while older fishes are sexually mature. Can this knowledge be applied in any way to the estimation of fish age?

02 March 2013 4,489 13 View

Amphidromous species?

What are amphidromous species? Are there any obvious benefits to this life style? Examples of tropical species that exhibit amphidromy?

02 March 2013 9,299 1 View

Ways of aging fish without hard parts?

Otoliths and vertebrae are common hard parts used to age fish, are there other ways of estimating fish age?

02 March 2013 5,937 10 View

Does the presence or absence of scales determine uptake of metals from the environment by fish?

It is believed by some that scaleless fish take-up metals more than fish with scales, can anyone lend scientific credence to these claims?

02 March 2013 6,152 7 View

Can anyone fill me in on the steps to acquiring SPOT satellite images?

I'm thinking of acquiring imagery of water-bodies and riparian vegetation over a 10year span to try and relate land use with deterioration of water quality

31 December 2012 2,812 10 View

How to use remote sensing to detect the change in depth of a lagoon?

For instance: change in depth due to artisanal dredging over a period of years. Where do technologies like aquasat and MODIS come in?

31 December 2012 2,592 9 View

Is the incidence of neoplasia connected to the occurrence of contaminants?

This is quite an interesting study, but i'm interested in knowing if the incidence of neoplasia in this study is being related to the occurrence of contaminants where the organisms are sampled from?

01 January 1970 8,051 1 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Binary Logistic Generalized Linear Mixed model in SPSS. Is it doable?

I want to analyses the proportion of swimming sperm of three species of fish in two salinities. To analyse the proportion of swimming sperm in a Generalized Linear Model, I would use a Binary...

03 March 2021 2,297 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

What test should i use in comparing the correlation between categorical and continuous variables?

Dear all, I have the variable (Surgery duration) represented by values in minutes and the variable (preoperative neuropraxia cases) represented as (Yes/No) values. I want to compare these two...

03 March 2021 5,427 5 View