GLOBAL JOURNAL OF FISHERIES SCIENCE
Integrity Research Journals
ISSN: 2782-750X
Model: Open Access/Peer Reviewed
DOI: 10.31248/GJFS
Start Year: 2018
Email: gjfs@integrityresjournals.org
The mean condition dynamics of Pachymelania byronensis (Wood, 1828) (Gastropoda: Thiaridae) in the Cross River, Nigeria
https://doi.org/10.31248/GJFS2023.043 | Article Number: A17362902 | Vol.5 (1) - October 2023
Received Date: 24 July 2023 | Accepted Date: 12 October 2023 | Published Date: 30 October 2023
Authors: Richard P. King and Bassey E. Akpan*
Keywords: Cross River, Condition index, hydrological parameters, Pachymelania byronensis.
The monthly mean condition index (Kmean) of Pachymelania byronensis was computed from a unique combination of the body weight–shell height relationship parameters (i.e. a, b). Shell height (H) and weight (W) were measured for each specimen. There was a wide (827.7 –fold) variation, from a minimum of 0.012 in October to a maximum of 9.932 in December. Mean annual value was 8.064. The relatively low values of the condition index in February – May, August -- October were attributed to declines in body weight as the gametes are released during spawning. This gastropod species spawns three times a year, a feature that is responsible for the high density of the gastropod in the river and its capacity to sustain a year-round strong fishing pressure. The monthly condition indices significantly correlated with river hydrological parameters, including rainfall, surface temperature, discharge, transparency, pH, and dissolved oxygen concentration.
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