dataset : Coastal Fisheries Resource Monitoring dataset

Texas Parks & Wildlife Department
Mark R. Fisher


Coastal Fisheries Resource Monitoring dataset

Mark R. Fisher

Coastal Fisheries has an extensive, long-term (20+ years) assessment program providing important resource trend data. Data trends were last published in 2000 for the period 1975−1997. o Fishery-independent sampling, conducted annually using a variety of gears, seeks to assess the fish community as a whole while providing statistically precise data on species of major interest. Each gear type has greater efficiency for certain species, though all sampled specimens are identified and enumerated. The major gear types and the resultant primary information are as follows: ƒ Gill nets – abundance and size of adult finfish, especially trout and drum ƒ Bag seine – abundance, size, and diversity of juvenile finfish and macrocrustaceans ƒ Bay trawl – abundance and size of shrimp and crabs ƒ Gulf trawl – movement, growth, and abundance of shrimp in marine waters ƒ Oyster dredge – oyster abundance and recruitment - A habitat characterization is done with each assessment type. Except for an IBI analysis in a recent report on the Texas shrimp fishery, little evidence of the use of habitat data was noted. - Standardized assessments use widely accepted procedures that are comprehensively described in an operations manual providing a readily available reference for employees. After a staff review, the operations manual is revised annually to reflect needed procedural changes. - Analytical methods are adequately described in the summary reports. 13 - Sample sites are randomly determined each year within each ecosystem to achieve the desired goal of a coastwide assessment. Sampling frequency has been evaluated to give an efficient mix of acceptable precision requirements and available manpower. Sampling strategy is designed to produce precise coastwide estimates of a few economically important species. Standard errors for the primary recreational species range from 10% to 20% of the estimate. Regional estimates would have less precision than coastwide estimates. - Analysis of the precision associated with various sample sizes is efficiently addressed in an in-house report, “Sample Size Analysis of Coastal Fisheries Resource Monitoring Program.” The findings indicate that current assessment strategies are scientifically sound and represent a balance between available resources and reasonable statistical precision for economically important species.


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