E-ISSN 2676-2862 | ISSN 2676-2854
 

Original Research (Original Article) 


Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana

Jacob Cohen, Kobina Yankson, Emmanuel Acheampong, Daniel Wubal.

Abstract
It is widely recognized that growth of sessile intertidal organisms is largely driven by tidal exposure. However, data supporting exact manifestation of this effect on Crassostrea tulipa is lacking, limiting management of the species to enhance nutrition and livelihood opportunities for coastal communities in West Africa. We investigated the growth of the species at 3 tidal heights [13 22 cm, 23 32 cm and 33 41 cm] above neap tide mean low water (MLW)] focusing on 3 parameters, i.e. shell height, condition index (CI) and gonadal development. Three hundred and thirty-three individual oysters from 10 colonies randomly selected from 2 stations, 500 and 600 m from the sea, around an open lagoon were investigated. CI was determined as the ratio between dry meat weight and inner shell volume; gonadal development was determined via histological analysis of gonad tissues. Shell height and CI of the oyster increased with tidal elevation irrespective of whether they were closer to or further from the sea. These findings agree with reports on other bivalves, suggesting that short tidal inundation promotes growth of C. tulipa. In terms of gonads, five stages of development were identified; all occurred among oysters located at lowest tidal levels (13 22 cm above MLW), possibly due to continuous breeding as a result of increased food supply by long inundation. The proportion of ripe gonads increased with tidal height; ≈67% of gonads found at the highest tidal levels were ripe suggesting discontinuous breeding in the higher-level oysters.

Key words: Condition index, gonadal development, meat content, shell height, shell length, tidal height.


 
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How to Cite this Article
Pubmed Style

Cohen J, Yankson K, EA, Wubal D. Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716


Web Style

Cohen J, Yankson K, EA, Wubal D. Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. http://www.jfcomonline.com/?mno=93154 [Access: May 10, 2020]. doi:10.5455/jfcom.20200317105716


AMA (American Medical Association) Style

Cohen J, Yankson K, EA, Wubal D. Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716



Vancouver/ICMJE Style

Cohen J, Yankson K, EA, Wubal D. Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716



Harvard Style

Cohen, J., Yankson, . K., , . E. A. & Wubal, . D. (2020) Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716



Turabian Style

Cohen, Jacob, Kobina Yankson, Emmanuel Acheampong, and Daniel Wubal. 2020. Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716



Chicago Style

Cohen, Jacob, Kobina Yankson, Emmanuel Acheampong, and Daniel Wubal. "Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana." doi:10.5455/jfcom.20200317105716



MLA (The Modern Language Association) Style

Cohen, Jacob, Kobina Yankson, Emmanuel Acheampong, and Daniel Wubal. "Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana." doi:10.5455/jfcom.20200317105716



APA (American Psychological Association) Style

Cohen, J., Yankson, . K., , . E. A. & Wubal, . D. (2020) Effects of Tidal Exposure on Bivalve Molluscs: First Stab at the Case of West African Mangrove Oyster (Crassostrea tulipa) in Benya Lagoon, Elmina, Ghana. doi:10.5455/jfcom.20200317105716