Related Experiment Video
Updated: May 17, 2026
07:41
Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
Published on: July 30, 2019
Empirical standard mass equation for Salmo marmoratus
M Lorenzoni1, D Giannetto, G Maio
1Dipartimento di Biologia Cellulare e Ambientale, Università di Perugia, Perugia, Italy.
Journal of Fish Biology
|November 8, 2012
Summary
Researchers developed a standard mass (W(s)) equation for marble trout (Salmo marmoratus) using the empirical percentile (EmP) method. This equation accurately predicts fish weight based on total length (L(T)) across their European range.
Area of Science:
- Ichthyology
- Aquatic Ecology
- Fisheries Science
Background:
- Accurate estimation of fish biomass is crucial for effective fisheries management and ecological assessments.
- Existing length-weight relationships may not precisely represent specific species like marble trout (Salmo marmoratus).
- The empirical percentile (EmP) method offers a robust approach for deriving standard weight equations.
Purpose of the Study:
- To derive a species-specific standard mass (W(s)) equation for marble trout (Salmo marmoratus).
- To establish a reliable tool for assessing the condition and biomass of marble trout populations.
- To provide a scientifically sound basis for fisheries management of this species.
Main Methods:
- Utilized a large dataset of 36,460 marble trout specimens.
- Measured total length (L(T)) and mass (W) for each specimen.
- Applied the empirical percentile (EmP) method to compute the standard mass (W(s)) equation.
Main Results:
- Calculated the standard mass (W(s)) equation: log(10) W(s) = -5.208 + 3.202 log(10) L(T) - 0.046 (log(10) L(T))(2).
- The equation is valid for marble trout with total lengths (L(T)) ranging from 90 to 570 mm.
- The derived equation is applicable across the entire European distribution area of Salmo marmoratus.
Conclusions:
- The developed EmP W(s) equation provides an accurate method for estimating marble trout mass from length.
- This tool will aid in standardized biological assessments and sustainable management of marble trout fisheries.
- The study contributes valuable data to the understanding of Salmo marmoratus growth patterns and ecological role.
Related Concept Videos
01:54Molar Mass
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
01:15High-Resolution Mass Spectrometry (HRMS)
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
02:37Experimental Determination of Chemical Formula
The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
01:52Atomic Mass
Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...
01:20Maxwell-Boltzmann Distribution: Problem Solving
Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
01:19Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...