Publications by L Kell
Annex 1: Summary of SIOFA Data
Introduction This report presents an analysis of the SIOFA Deep Sea Sharks data, focusing on data preparation, analysis, and visualization. The primary objective is to get meaningful patterns and trends from the data, which can inform decisions and strategies related to shark conservation and fishing practices in the SIOFA area. Data Preparation T...
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Annex 2: Summary of IEO Data
Introduction This document provides a summary of the shark dataset, which includes information on shark captures such as species, length, weight, sex, maturity, and other relevant data. The aim is to understand the diversity of species, the types of data collected, and assess the quality and coverage of the dataset. Data Preparation This section i...
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Annex 3: Life History Parameters for Centroscymnus coelolepis
Introduction In this analysis, we update the biological knowledge on Centroscymnus coelolepis, using data from catch data and biological sampling obtained from SIOFA and IEO Based on these data we update the life history parameters such as the length-weight relationship (\(W=aL^b\)), length at maturity, and maximum size (\(L_{max}\)). The analysis ...
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Annex 4: Length Based Indicators for Centroscymnus coelolepis
Using length-based indicators (LBIs) over length-based methods (LBMs) offers several advantages, particularly in the context of fisheries management where data limitations and the need for robust, understandable metrics are paramount. This justification draws on the detailed examination of fisheries challenges, the limitations of catch-only methods...
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Annex 5: Catch and EffortAnalysis for Centroscymnus coelolepis
SIOFA dataset The dataset contains information on shark catches. In this document we focus on the Portugese dogfish (Centroscymnus coelolepsis). Catch-per-unit-of-effort (CPUEs) are calculated for each gear type using different measures of fishing effort depending on the gear. For the different types of trawlers, CPUE is calculated using the tow du...
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Annex 6: Priors derived from FishBase
main shark’s species caught by SIOFA Portuguese dogfish (Centroscymnus coelolepis) Birdbeak dogfish (Deania calcea) Kitefin shark (Dalatias licha) Gulper sharks (Centrophorus spp) Lanternshark (Etmopterus spp) fisheries, ,depending on the areas are bottom longline midwater trawl demersal trawl demersal line Data [,1] [,2] ...
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Annex 7: Maturity Ogive Disgnostics for Centroscymnus coelolepis
Figure 1 . Fit logistic regression model Figure 2 . 1. Summary of Model Fit Use summary(model) to get an overview of the model fit, including coefficients, standard errors, z-values, and P-values for each predictor. Call: glm(formula = mature ~ len + sex + len:sex + len:Type, family = binomial, data = mat) Deviance Residuals: Min ...
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SIOFA-ERAF
Stock Assessment Framework for Deepwater Sharks in SIOFA DELEGATION OF THE EUROPEAN UNION 23 February, 2024 Introduction The Southern Indian Ocean Fisheries Agreement (SIOFA) plays a critical role in the conservation and sustainable use of fishery resources in the high seas of the Southern Indian Ocean. Challenges Deepwater shark populations fac...
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Sole Time varying SRR
library(FLCore) library(FLBRP) library(ggplotFL) require(FLasher) require(FLCandy) library(FLSRTMB) library(plyr) library(dplyr) library(reshape) library(akima) library(scales) library(ggplot2); theme_set(theme_bw()) setwd("~/Desktop/active/srr/Rmd") Modifications 1 Call function with parameters/priors for steepness, \(R_0\), sigma R and ...
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Jump to Introduction Jump to Installation Jump to Simulation Jump to More Information Jump to References Introduction In fisheries management, the selection of appropriate indicators or model-based trends for use in Harvest Control Rules (HCR) is vital. These indicators should accurately classify the stock’s status and identify trends in stock s...
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