Fishery Information

Table 1. Fishery Information.
Field Value
Fishery Example Data
Location Example Location
Species Octopus cyanea
Common_Name Day octopus
Author A. Hordyk (
Date June 2023

At-Age Schedules

Figure 1. a) The mean weight-at-age, with 10th and 90th percentiles., b) The natural mortality-at-age schedule. c) The maturity-at-age schedule. d)The post-spawning mortality-at-age schedule.

Figure 1. a) The mean weight-at-age, with 10th and 90th percentiles., b) The natural mortality-at-age schedule. c) The maturity-at-age schedule. d)The post-spawning mortality-at-age schedule.

Table 2. Table of values for the At-Age schedules.
Age Mean_Weight 10th 90th Maturity M.x M.y
0 0.00 0.00 0.00 0.00 0.15 0.15
1 0.01 0.00 0.02 0.00 0.15 0.15
2 0.05 0.02 0.08 0.00 0.15 0.15
3 0.12 0.06 0.20 0.00 0.15 0.15
4 0.23 0.11 0.38 0.00 0.15 0.15
5 0.40 0.19 0.66 0.00 0.15 0.15
6 0.60 0.29 0.99 0.00 0.15 0.15
7 0.86 0.41 1.42 0.00 0.15 0.15
8 1.17 0.56 1.93 0.00 0.15 0.15
9 1.54 0.74 2.54 0.00 0.15 0.15
10 1.96 0.94 3.23 0.00 0.15 0.15
11 2.44 1.18 4.02 0.05 0.15 0.15
12 2.99 1.44 4.93 0.95 0.15 0.15
13 3.60 1.73 5.94 1.00 0.15 0.15
14 4.27 2.06 7.04 1.00 0.15 0.15

Data

Catch-at-Weight

Figure 2. The catch-at-weight data with the model fit shown as a blue line. Each plot is standardised to sum to 1 across the weight classes. The sample size is shown in the top left corner.

Figure 2. The catch-at-weight data with the model fit shown as a blue line. Each plot is standardised to sum to 1 across the weight classes. The sample size is shown in the top left corner.

Indices

Figure 3. a) The indices of vulnerable biomass, b) effort, and c) catch, with 10 and 90th percentiles. The blue dashed line indicates the model fit. Empty plots mean no data was provided.

Figure 3. a) The indices of vulnerable biomass, b) effort, and c) catch, with 10 and 90th percentiles. The blue dashed line indicates the model fit. Empty plots mean no data was provided.

Assessment Results

Tables

Table 3. Assumed parameters used in the assessment.
Parameter Value Description
h 0.85 Assumed steepness of stock-recruit curve
sigmaR 0.40 Standard deviation of log-normal recruitment deviations
use_F_pen 1.00 Use the penalty for random walk in F?
sigmaF_m 0.40 Standard deviation for random walk penalty for F
use_R0_pen 1.00 Use the penalty for random walk in seasonal recruitment?
sigmaR0 0.30 Standard deviation for random walk penalty for seasonal recruitment

Seasonal Recruitment Pattern

Figure 4. The estimated seasonal recruitment pattern.

Figure 4. The estimated seasonal recruitment pattern.

Selectivity

Figure 5. The estimated selectivity pattern.

Figure 5. The estimated selectivity pattern.

Time-Series

Figure 6. The estimated spawning potential ratio.

Figure 6. The estimated spawning potential ratio.

Figure 7. The estimated fishing mortality.

Figure 7. The estimated fishing mortality.

Reference Points

Figure 8. The mean monthly F and SPR (red lines) and the optimal values calculated from the HARA utility model with two values for the exponent (rows). Lower values of the HARA exponent mean higher utility for lower variance in catches throughout the year. Higher values of the HARA exponent mean greater utilty on the overall annual catch.

Figure 8. The mean monthly F and SPR (red lines) and the optimal values calculated from the HARA utility model with two values for the exponent (rows). Lower values of the HARA exponent mean higher utility for lower variance in catches throughout the year. Higher values of the HARA exponent mean greater utilty on the overall annual catch.