- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
Abstract Submission No. | ABS-2022-09-0358 |
Title of Abstract | Survey on the succession of fouling organisms at Cochin estuary, Southwest coast of India Shameena M. K. and Kaladharan P. |
Authors | SHAMEENA M K* |
Organisation | CENTRAL MARINE FISHERIES RESEARCH INSTITUTE, KOCHI |
Address | MALIYAM VEETIL, CHALACKAL, MARAMPILLY P.O. , ALUVA ALUVA, KERALA, India Pincode: 683105 Mobile: 8921190274 E-mail: shameena.mk57@gmail.com |
Country | India |
Presentation | Oral |
Abstract | The succession of fouling organisms at National Institute of Fisheries Post Harvest Technology and Training (NIFPHATT) jetty of Cochin estuary was investigated from October 2019 to March 2020. Samples were collected using twelve sets of three test panels made from wood of Ailanthus sp. (17 x 15 x 1.6 cm), glass (20 x 12 x 0.02 cm) and stainless steel, SS304 grade (17 x 15 x 0.01 cm) each with a rough and a smooth surface, submerged for six-month periods. Analysis of fouling panels was carried out using Stereomicroscope. Maximum fouling biomass of 1.19 gcm-2 was obtained on wooden panels (after 120 days) when compared to SS and glass panels which showed the surface specificity for biofouling. The common fouling communities that settled on the panels include barnacles and Modiolus sp. After 30 days deployment, glass panels had Neritina sp., barnacles and encrusting bryozoans being amongst the early colonizers while only Neritina sp. were appeared on wooden panels. The recruitment of barnacles, modiolus, calcareous polychaetes, isopods and oysters were first observed on wooden panels submerged for 60 days. SS panels had barnacles, modiolus and calcareous polychaetes when retrieved after 90 days; amphipods after 60 days and isopods and gastropods after 120 days. Crab was found on the rough surface of glass panels retrieved after 150 days. Spats of barnacles were observed only on wooden panels while oyster spats were found to be present on glass and SS panels. The presence of algae, especially diatoms such as Nitschia, Navicula sp. were observed on all the substrata used for the study. Barnacle recruitment occurred most frequently throughout the study on all the panels. The percentage cover of barnacles ranged between 20 and 100%. The number of barnacles recruited varied from 0 to 104 no. cm-2 on SS panels, from 2 to 41 no. cm-2 and 0 to 59 no. cm-2 on glass and wooden panels, respectively. In spite of a total of 9 macrofouling organisms recorded on the three panels, the presence of encrusting bryozoan and crab were noted on glass panels. Amphipods, isopods, gastropods and Neritina sp. were less abundantly found on all the three panels during the course of succession. Calcareous polychaetes were appeared only on wood retrieved after 60 days and showed maximum relative abundance of 60 and 100% on smooth and rough surfaces, respectively but suddenly diminished thereafter. The spats of oyster were uniformly found attached to both surfaces of glass panels retrieved after 60 days and later increased their number with time of submersion. They grew in size and develop their hard shells for protection. They were also confined to the rough surface of wooden panels too. The presence of polychaetes was recorded on all the panels only after 120 days of submersion, with 100% abundance on SS panel (both surfaces) and glass panel (rough surface). But later they were diminished or declined in number. |