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A Comparative Study on the Blood Osmolality of the Mud Crab (Scylla serrata) and the Blue Swimming Crab (Portunus pelagicus) Exposed to Different Salinities: A Case Study for the Topic "Osmotic Regulation" in High School Biology

Nongnud Tangkrock-olan, Ratsamee Ketpadung

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Abstract

Blood osmolality of the mud crab (Scylla serrata) and blue swimming crab (Portunus pelagicus) was examined 0, 1, 3, 6, 9, 12, 24, 48, 72 and 96 hrs after transferred from seawater of salinity of 30 ppt to salinities of 5, 10, 15, 20, 25, 30 (control), 35 and 40 ppt at 25°C. Blood osmolality of both crab species reached to constant levels within 72 hrs. S. serrata survived for 96 hrs in all salinities tested whereas P. pelagicus survived for 96 hrs in salinities of 15, 20, 25, 30, 35 and 40 ppt but died 12 hrs after transferred into salinities of 5 and 10 ppt. Thus, the salinity ranges over which osmoregulation was performed efficiently were 5 40 ppt for S. serrata and 15 40 ppt for P. pelagicus. The results showed that S. serrata is a strong hyperosmotic regulator whereas P. pelagicus is an ordinary osmoconformer. This study could probably provide a laboratory model for teaching of osmotic regulation system for high school biology.

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What this paper is about

Blood osmolality of the mud crab (Scylla serrata) and blue swimming crab (Portunus pelagicus) was examined 0, 1, 3, 6, 9, 12, 24, 48, 72 and 96 hrs after transferred from seawater of salinity of 30 ppt to salinities of 5, 10, 15, 20, 25, 30 (control), 35 and 40 ppt at 25°C. Blood osmolality of both crab species reached to constant levels within 72 hrs. S. serrata survived for 96 hrs in all salinities tested whereas P. pelagicus survived for 96 hrs in salinities of 15, 20, 25, 30, 35 and 40 ppt but died 12 hrs after transferred into salinities of 5 and 10 ppt. Thus, the salinity ranges over which osmoregulation was performed efficiently were 5 40 ppt for S. serrata and 15 40 ppt for P. pelagicus. The results showed that S. serrata is a strong hyperosmotic regulator whereas P. pelagicus is an ordinary osmoconformer. This study could probably provide a laboratory model for teaching of osmotic regulation system for high school biology.

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Available abstract

Blood osmolality of the mud crab (Scylla serrata) and blue swimming crab (Portunus pelagicus) was examined 0, 1, 3, 6, 9, 12, 24, 48, 72 and 96 hrs after transferred from seawater of salinity of 30 ppt to salinities of 5, 10, 15, 20, 25, 30 (control), 35 and 40 ppt at 25°C. Blood osmolality of both crab species reached to constant levels within 72 hrs. S. serrata survived for 96 hrs in all salinities tested whereas P. pelagicus survived for 96 hrs in salinities of 15, 20, 25, 30, 35 and 40 ppt but died 12 hrs after transferred into salinities of 5 and 10 ppt. Thus, the salinity ranges over which osmoregulation was performed efficiently were 5 40 ppt for S. serrata and 15 40 ppt for P. pelagicus. The results showed that S. serrata is a strong hyperosmotic regulator whereas P. pelagicus is an ordinary osmoconformer. This study could probably provide a laboratory model for teaching of osmotic regulation system for high school biology.

Key concepts: Portunus pelagicus, Scylla serrata, Biology, Salinity, Animal science, Osmotic concentration, Osmoregulation, Fishery

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A Comparative Study on the Blood Osmolality of the Mud Crab (Scylla serrata) and the Blue Swimming Crab (Portunus pelagicus) Exposed to Different Salinities: A Case Study for the Topic "Osmotic Regulation" in High School Biology — Research Paper | ScholarLens