Comparative Morphometry of the Genus Thais from Nembe, Bakana and Calabar

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Precious Itolima
A. P. Ugbomeh
J. N. Onwuteaka

Abstract

Aim: Morphometry of Thais spp found in the Niger Delta Mangrove vegetation of Bakana, Calabar and Nembe were examined and compared.


Study Design: The study is a cross-sectional observational study


Place and Duration of Study: The study ws carried out in Bakana, Calabar and Nembe during a period of six months(January to June, 2018).


Methodology: A total of 600 specimens (100 specimens per month) were collected during a period of six months (January to June 2018) from the three sampling communities. Three different species were identified namely: Thais coronata, Thais haemastoma and Thais lacera. Shell dimensions were measured to the nearest millimeter using Vernier calipers and weighed, to get the morphometric Characteristics: Whorl Diameter (WD), Shell length (SL), Shell width (SW), Body whorl length (BWL), Aperture length (AL), Aperture Width (AW) Shell Breadth (SB), and Animal Weight (AW). Number of whorls, number of primary spiral cord on the body and number of ridges or teeth inside of outer tip of the aperture were counted.


Results: The disparity between the morphometric traits across the different species identified were minimal as most of the species had similar values of morphometric traits. However, differences can be identified using their colour; thais coronata (dirty light grey), T haemastoma (light grey), and T lacera (plane grey). The Three (3) species had a modal length class of 3.5cm to 4.5cm. Thais coronata and Thais lacera had a modal weight class of 9-11grams while Thais haemastoma had a modal weight class of 6-7grams. It was observed with the aid of length/weight relationship that the found in all study.


Conclusion: It was observed with the aid of length/weight relationship that the Thais specimen found in all study locations exhibited a very weak linear relationship with very low R2 values across locations. The exponent b of Thais coronata and Thais haemastoma and T. lacera across the three study locations indicate a negative allometric growth pattern. The Month of April for samples collected from Nembe had the highest condition factor for the three (3) species. T. coronata (4.4), T. lacera (6.38) and T haemastoma (5.5).

Keywords:
Comparative, morphometry, genus thais, Nembe, bakana, Calabar

Article Details

How to Cite
Itolima, P., Ugbomeh, A. P., & Onwuteaka, J. N. (2019). Comparative Morphometry of the Genus Thais from Nembe, Bakana and Calabar. Asian Journal of Fisheries and Aquatic Research, 3(2), 1-14. Retrieved from http://journalajfar.com/index.php/AJFAR/article/view/30029
Section
Original Research Article