Quantitative Fisheries Stock Assessment: Choice, Dynamics and Uncertainty.Ray Hilborn , Carl J. Walters

1992 ◽  
Vol 67 (4) ◽  
pp. 543-544
Author(s):  
Jerome J. Pella
Keyword(s):  
Stock Assessment ◽  
Choice Dynamics

FIRST RECORD AND INITIAL HYDROACOUSTIC STOCK ASSESSMENT OF POLLAN COREGONUS AUTUMNALIS PALLAS IN LOUGH ALLEN, IRELAND

2010 ◽  
Vol 110 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Andrew J. Harrison ◽  
Fiona L. Kelly ◽  
Robert S. Rosell ◽  
Trevor W.S. Champ ◽  
Lynda Connor ◽  
...  
Keyword(s):  
Stock Assessment ◽  
First Record

THE STOCK ASSESSMENT OF OTOLITHES RUBER IN NORTH-WEST ARABIAN GULF

2010 ◽  
Vol 23 (0) ◽  
pp. 1-14
Author(s):  
Amina A. Hashim ◽  
A.R.M.Mohamed ◽  
Amjad K. Resen
Keyword(s):  
Stock Assessment ◽  
Arabian Gulf ◽  
North West ◽  
Otolithes Ruber

Fecundity and Gonado-somatic Index of Trichiurus lepturus (Linnaeus, 1758) Along the Zamboanga del Norte Coast

2018 ◽  
Vol 6 (7) ◽  
pp. 120
Author(s):  
Ma. Dulce C. Guillena
Keyword(s):  
Sex Ratio ◽  
Stock Assessment ◽  
Chi Square ◽  
Moon Phases ◽  
Ovary Weight ◽  
Moment Coefficient ◽  
Trichiurus Lepturus ◽  
Significant Difference ◽  
The Relationship ◽  
Somatic Index

Gonado-somatic index and fecundity are tools for measuring the sexual maturity and ability of animals to reproduce.  This study investigates the reproduction of Trichiurus lepturus. Specifically, this aimed to determine the sex ratio, the GSI, the relationship between fecundity and total length, fecundity and total weight, fecundity and ovary weight. The Descriptive Method of research was used.  Percentage and chi-square was utilized in determining the percentage of occurrence and sex ratio respectively.   Pearson r Product Moment Coefficient of Correlation was used to determine the relationships of the parameters. The study revealed that females outnumbered males and the sex ratio for different month showed significant difference.  Spawning season was observed to occur in November and December as revealed in its GSI values and it synchronized with the full and new moon phases.  Fecundity is positively correlated with body weight, body size, and ovary weight where ovary weight is observed to be the best index for fecundity.  The results of this study could be used further for formal stock assessment of cutlassfish fishery.

Recount pirarucu: a method for evaluating the quality of the pirarucu counts.

2011 ◽  
Vol 7 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Lorena Candice de Araújo Andrade ◽  
Ellen Silvia Ramos Amaral ◽  
Nataluzo Balbino da Silva ◽  
Helder Lima de Queiroz
Keyword(s):  
Management System ◽  
Main Parameter ◽  
Stock Assessment ◽  
Counting Method ◽  
Technical Staff

The pirarucu counting method is a simplified stock assessment that has been used as the main parameter for establishing the annual fishing quotas in the management system of the Mamirauá and Amanã Reserves. In spite of the method’s directness, considering the recent expansion of managed fisheries, we cannot confirm that the counters thoroughly obey the original methodology. There is a concern of a technical nature, as the results of the counts directly influence the fishing quotas, and the lack of technical supervision or the inadequate application of the method are factors that can compromise the management system as a whole. This study aims to assess the counts that took place in six fishing environments of the Jarauá Sector, Mamirauá Reserve, and in four fishing environments of the area of the Pantaleão Fishing Agreement Complex, Amanã Reserve. We verified the consistency of the information resulting from the count, presented to the technical staff. To do this, we conducted recounts of juvenile and adult pirarucus in the same environments. In the Jarauá Sector we found significant differences in the counting results from Samaumerinha do Tucuxi and Curuçá do Centro. In Comprido do Maciel we found differences regarding the number of counted areas. In the sampled environments from the Pantaleão region we did not find significant differences between the counts. The results highlight the importance of creating assessment mechanisms for the counts, for the purpose of preventing possible alterations in the results that might influence the fishing quotas without a biological reason for justifying such quotas.

Chesapeake Bay Stock Assessment: Who are they, and Where are they?

1992 ◽  
Vol 26 (12) ◽  
pp. 2705-2709 ◽  
Author(s):  
H. M. Austin
Keyword(s):  
Chesapeake Bay ◽  
Stock Assessment ◽  
Human Consumption ◽  
Population Fluctuations ◽  
Important Species ◽  
Fisheries Resources ◽  
Environmentally Sensitive ◽  
Climate Scale ◽  
Resource And Environment

The Chesapeake Bay, while a significant habitat for fisheries resources, is in actuality an aquatic “bedroom community”, as many of the economically important species are seasonally transient. The pressure on these resources due to their demand for human consumption and recreation, proximity to extensive industrial activity along the shores, and climate scale environmental fluctuations has resulted in stock declines by most important species. Our inability to separate natural population fluctuations from those of anthropogenic origin complicates management efforts. The only way to make these separations, and subsequent informed management decisions is by supporting long-term stock assessment programs (monitoring) in the Bay which allow us to examine trends, cycles and stochastic processes between resource and environment. These programs need to monitor both recruitment and fishing mortality rates of the economically important species, and to identify and monitor the environmentally sensitive “canary” species.

Review of the life history, fisheries, and stock assessment for small tunas in the Atlantic Ocean

2021 ◽  
Author(s):  
Flávia Lucena-Frédou ◽  
Bruno Mourato ◽  
Thierry Frédou ◽  
Pedro G. Lino ◽  
Rubén Muñoz-Lechuga ◽  
...  
Keyword(s):  
Life History ◽  
Atlantic Ocean ◽  
Stock Assessment
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