Biology and population dynamics of the black clam villorita cyprinoides (Gray, 1825) in the vembanad lake (Record no. 28041)
| 000 -LEADER | |
|---|---|
| fixed length control field | 02055nam a22001217a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 639.3 |
| Item number | ANJ/BI |
| 100 ## - MAIN ENTRY--AUTHOR NAME | |
| Personal name | Anju, A. V. |
| 245 ## - TITLE STATEMENT | |
| Title | Biology and population dynamics of the black clam villorita cyprinoides (Gray, 1825) in the vembanad lake |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication | Panangad |
| Name of publisher | KUFOS |
| Year of publication | 2018 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 108p. |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc | Abstract- The black clam, Villorita cyprinoides is an economically important bivalve found along the Indian coast and exclusively sustains the molluscan fishery of Vembanad Lake. Present study analyses the biological aspects and population parameters of Villorita cyprinoides in the Vembanad Lake. It is a continuous breeder with two peak periods of spawning viz, June ā August and December ā February. Gonad and condition indices were found directly related to the reproductive cycle, clams with fully matured gonad have maximum value of GI and CI, while digestive gland index was peak during the post spawning period. The overall male to female ratio observed was 1:1.2. The allometric studies in Villorita cyprinoides have revealed the existence of significant correlation between various morphological characters. The population parameters of this species were assessed to evaluate the status of the stock. The asymptotic length (Lā) was 46.2mm, while growth coefficient (K) was 0.9 yr-1 and initial condition parameter (t0) was -0.016 yr. It attained a length of 27.72mm at the end of first year, 38.66mm at second year and 43.15mm at the end of third year. The estimated total mortality (Z), natural mortality (M), fishing mortality (F) to be 3.07 yr-1, 1.37 yr-1 and1.70 yr-1 respectively. The recruitment pattern was continuous over the year with two major peaks (August and January). The exploitation rate (E = 0.553) which surpassed the maximum exploitation rate (Emax = 0.539) suggests the need to regulate harvesting. The Socio-economic survey attempted in the present study reveal the major livelihood problems faced by the clam fishers of Vembanad Lake, are low income, intensive labour and indebtedness. |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | Thesis |
| Withdrawn status | Lost status | Collection code | Home library | Current library | Shelving location | Date acquired | Full call number | Accession Number | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Reference | KUFOS Central Library | KUFOS Central Library | Thesis Shelf | 28/05/2019 | 639.3 ANJ/BI | TH193 | Thesis |