# TERMS USED IN AQUACULTURE SFR | FCR | SGR | GF3 | FCE | BWG | RGR | PER | FI:FO | ADG | B-FCR | E-FCR | K
Summary of parameters and terms used in aquaculture

## FCR: Feed Conversion Rate

FCR represents kilograms of feed needed to produce one kilogram of fish.

• FCR= Feed given / Animal weight gain

## SGR: Specific Growth Rate

SFR is a coefficient that measures the percentage increase in fish weight per day.
SGR=(Ln(Wt)-Ln(W0))*100/t(d)

• W0[g]= the weight in grams at the beginning of the period
• Wt [g]= the weight in grams at the end of the period
• t[d]= period, expressed in number of days
• Ln = natural logarithm

## SFR: Specific Feeding Rate

SFR corresponds to the amount of food eaten per day and expressed as a percentage of the fish’s body weight.

## GF3: Thermal Growth Coefficient

Measure of daily growth in a given period that takes into account temperature.
GF3 = [(W2(1/3) – W1(1/3) ) / ºD ] x 1000

• W2 = weight (g) at time 2 (end of period)
• W1 = weight (g) at time 1 (beginning of period)
• ºD = Degree-days, sum of daily temperatures in °C between t1 and t2 (or duration in days x average temperature in period)

## FCE: Feed Conversion Efficiency

The efficiency of a feed is normally measured by the amount necessary to produce a unit weight of fish.
FCE= Wt of food presented / Wt of animal produced

• Wt = means the weight in a certain period ## BWG: Body Weight Gain - PG: Peso Ganado

PG (g) = Final weight – initial weight

## RGR: Relative Growth Rate

RGR (%) = Final weight – initial weight / initial weight

## PER: Protein Efficiency Ratio

PER (%) = Increase in biomass in the tank / total protein ingested

## FI:FO: Fish In Fish Out

Amount of wild fish needed to produce 1 kg of aquaculture fish
FI:FO (%) = FCR x (% fish meal + % fish oil in feed)

Growth rate
Average daily gain (g) = body weight gain (g) / number of days

## Survival Rate

Survival rate % = number of surviving animals at the end of the production cycle / total number of animals at the beginning of the cycle * 100

## B-FCR: Biological Feed Conversion Rate

Takes into account feed used, and all Biomass generated, including lost Biomass.
E-FCR = Amount of feed (kg) / (Biomass2 – Biomass1)

• Biomass1= Biomass at the beginning of the period
• Biomass2 = Biomass at the end of the period
• Lost Biomass= Biomass lost during the period (mortality, elimination)

## Stocking Density

Total fish Biomass per unit of tank volume
D = W / V

• D = Stocking density (kg/m3)
• W = Biomass (kg)
• V = volume (m3)

## Fork Length

Fork length (also referred to as length or standard length) is the length (cm) of a fish from the tip of its nose to the middle of the tail fork.

## K: Condition factor

Fork length (also referred to as length or standard length) is the length (cm) of a fish from the tip of its nose to the middle of the tail fork.

Condition factor (K) is an indicator of the leanness/fattiness of a fish, which is generally regarded as an indicator of fish´s health. If K is less than 1, fish are considered thin or poorly nourished, for higher than 1 levels, the relation of K to fattiness is usually species dependent.

K = [(W x 100) / L3]

• K = Condition factor
• W = weight (g)
• L = length (cm)
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