All Fisheries Calculators Related Post

Trawl Efficiency Calculator Efficiency Model: Herding Model (Sweep + Doors)Codend Capture OnlyFull Gear (Doors + Sweep + Codend)Pair Trawling Trawl Gear Parameters: Headline Height (m): Door Spread (m): Sweep Length (m): Towing Speed (knots): Codend Mesh (mm): Fish Length (cm): Calculate Trawl Efficiency Enter trawl gear parameters and click “Calculate Trawl Efficiency” to get herding, […]

Gillnet Selectivity Calculator Selectivity Model: Normal (Dome-shaped)Lognormal (Asymmetric)Gamma DistributionBimodal (Entanglement + Gilling) Gillnet & Fish Parameters: Mesh Size (mm): Hanging Ratio (0.3–0.7): Twine Diameter (mm): Species: Salmon (Oncorhynchus)HerringCodTilapiaCustom Min Length (cm): Max Length (cm): Calculate Gillnet Selectivity Enter gillnet parameters and click “Calculate Gillnet Selectivity” to get retention curve, peak length, and efficiency. About the

Mesh Size Calculator Calculation Mode: From L50 (Target 50% Retention)From MLS (Minimum Landing Size)From Lm50 (Length at 50% Maturity)Optimal Mesh for Yield-per-Recruit Fish & Gear Parameters: L50 Target (cm): Selection Range SR (cm): Species: Cod (Gadus morhua)HaddockPlaiceSoleShrimp (Pandalus)Custom Twine Thickness (mm): Hanging Ratio (0.3–0.7): Net Material: Polyethylene (PE)Polyamide (Nylon)Polypropylene Calculate Mesh Size Enter parameters and

Selectivity Curve Calculator Selectivity Model: Logistic (S-shaped)Knife-EdgeNormal (Dome-shaped)Lognormal Gear Parameters: L50 – Length at 50% Retention (cm): Selection Range SR = L75 – L25 (cm): Mesh Size (mm): Twine Thickness (mm): Minimum Length (cm): Maximum Length (cm): Calculate Selectivity Curve Enter gear parameters and click “Calculate Selectivity Curve” to visualize retention probability by length. About

Discards Calculator Discard Estimation Method: Ratio Estimator (Observer-Based)Self-Reported (Logbooks)Predictive Model (GLM/Delta)Post-Discard Survival Adjusted Fishery & Catch Data: Landed Catch (tons): Total Catch (landed + discards, tons): Effort (hauls/days): Observed Effort: Discards Observed (tons): Post-Discard Survival Rate (%): Calculate Discards Enter catch and effort data, then click “Calculate Discards” to get total discards, rate, mortality, and

Bycatch Estimation Calculator Estimation Method: Ratio Estimator (Observer Data)Stratified SamplingBootstrap ResamplingGeneralized Linear Model (GLM) Fishery & Effort Data: Target Species Catch (tons): Total Effort (hauls/days): Observed Effort (hauls/days): Bycatch in Observed Effort (tons): Number of Bycatch Species: Confidence Level (%): Calculate Bycatch Estimation Enter fishery data and click “Calculate Bycatch Estimation” to get total bycatch,

Quota Allocation Calculator Allocation Method: Historical Catch (Proportional)Equal Share (Flat)Vessel Capacity-BasedHybrid (Historical + Capacity) Total Allowable Catch (TAC): Fleet Data (Enter up to 10 vessels): + Add Vessel Calculate Quota Allocation Enter TAC and vessel data, then click “Calculate Quota Allocation” to get individual quotas and fairness metrics. About the Quota Allocation Calculator The Quota

Catch Limit Calculator Management Framework: Total Allowable Catch (TAC)Individual Transferable Quota (ITQ)Effort-Based Limit (Days at Sea)Size/Weight Limit per Trip Stock & Fleet Parameters: Maximum Sustainable Yield MSY (tons/year): Current Biomass B (tons): Fishing Mortality at MSY F_MSY (1/year): Number of Vessels: Days at Sea per Vessel: Catch Per Unit Effort CPUE (tons/day): Price per Ton

Harvest Rate Calculator Management Model: Logistic Growth (Schaefer)Fox Surplus ProductionRicker Stock-RecruitmentBeverton-Holt Population Parameters: Carrying Capacity K (tons): Intrinsic Growth Rate r (1/year): Current Biomass B (tons): Catchability q (1/effort): Fishing Effort E (boat-days): Price per Ton p ($/ton): Calculate Harvest Rate Enter population parameters and click “Calculate Harvest Rate” to get MSY, F_MSY, and sustainability

    Exploitation Rate Calculator Fishing Mortality (F, year⁻¹) Total Mortality (Z, year⁻¹) Calculate Exploitation Rate (E) About the Exploitation Rate Calculator The Exploitation Rate Calculator is a scientifically accurate, instant tool that computes the exploitation rate (E = F/Z) for any fish stock. Used by fisheries managers worldwide, this single formula reveals the fraction