• Corpus ID: 131710567

Age and growth of the striped catfish Pseudoplatystoma orinocoense of the average Orinoco in Venezuela

@inproceedings{Gonzlez2010AgeAG,
  title={Age and growth of the striped catfish Pseudoplatystoma orinocoense of the average Orinoco in Venezuela},
  author={{\'A}ngel Gonz{\'a}lez and Jeremy Mendoza and Freddy Arocha and Ar{\'i}stide M{\'a}rquez},
  year={2010}
}

• Ángel González, J. Mendoza, +1 author A. Márquez
• Published 1 June 2010
• Environmental Science

Considering the importance of the barred sorubim Pseudoplatystoma
orinocoense in the artisanal fishery landings of the middle Orinoco
region, in this study age and growth were estimated using ring counts
from dorsal spines of 120 fish. Sampling was carried out in the
mid-Orinoco channel and a flood lagoon using a gillnet with 10 cm mesh
opening. Parameters of the von Bertalanffy growth model were estimated
for back-calculated length at age data using maximum likelihood
methods. The presence of Lee´s phenomenon in back calculated
lengths at age led to the estimation of 2 growth curves: the first for
all back calculated data (Lt= 112,6 (1-exp(-0,08 (t+0,055)))) and the
other excluding back calculated data at ages 1 and 2 (Lt =
106,1(1-e(-0,089(t-0,082)))). A non parametric bootstrap procedure was
used to estimate model parameter confidence intervals. Results indicate
a relatively slow growth rate for P. orinocoense with a 95% confidence
interval of estimated average longevity understood between 28 and 42
years, that they agree with some works reported for the same species
and kindred species in different hydrographic basins of South America.