“STUDIES ON SOME BIOLOGICAL ASPECTS OF WHITE FISH, LACTARIUS LACTARIUS (BLOCH AND J.G. SCHNEIDER, 1801) OFF MANGALURU COAST, KARNATAKA”
| dc.contributor.advisor | KUMARNAIK L | |
| dc.contributor.author | SAHANA H. M., | |
| dc.date.accessioned | 2023-12-28T10:31:55Z | |
| dc.date.available | 2023-12-28T10:31:55Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | The whitefish, Lactarius lactarius (Bloch and Schneider, 1801) which is a monotypic species in the Family Lactariidae and it belongs to order Perciformes, has distributed all along the Indian coast. It is also called as false trevally or big-jawed jumper and is locally called as “Adai meenu” in Karnataka. Random samples of L. lactarius were collected fort-nightly from Mangaluru fish landing centre during April 2021 to January 2022. Based on the observations of total 502 samples out of which 303 were males and 199 were females ranging in size from 11.2 to 24.2 cm total length (TL) and 13 to 170.3 g total weight (TW) were used for studying the biological aspects. On analysing the gut content, it indicated that L. lactarius is a carnivorous species and the diet composed of Semi-digested matter (49.76%), teleost (23.19%), Crustaceans (17.76%) and fish scales (9.25%). The estimated size at first maturity for male and female was observed at 14.7 cm and 15 cm (TL) respectively. The overall sex-ratio of L. lactarius recorded as 1:0.65 which showed a dominance of males. The chi-square (χ2) test showed a significant difference during October, November and January. The gonado-somatic index value ranged from 0.5546 to 1.2106 in male and in females it ranged from 2.6168 to 3.7855. The highest GSI recorded during August for males and January for females. The fecundity ranged from 16,307 to 2,29,787 eggs with an average of 47,846 eggs. The ova-diameter ranged from 0.048 to 0.976 mm. The maturity stages of L. lactarius indicated that this species is a prolonged spawner, spawn throughout the year with a peak in January. The length-weight relationship for male was W= 0.0663 L 2.9284 and for females it was W=0.0768 L 2.9032. The relative condition factor (Kn) value for male and female was 1.00521 and 1.00346 respectively. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810204778 | |
| dc.language.iso | English | |
| dc.pages | 153 | |
| dc.publisher | KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR | |
| dc.sub | Fisheries Resource Management | |
| dc.theme | Fisheries Resource Management | |
| dc.these.type | M.F.Sc | |
| dc.title | “STUDIES ON SOME BIOLOGICAL ASPECTS OF WHITE FISH, LACTARIUS LACTARIUS (BLOCH AND J.G. SCHNEIDER, 1801) OFF MANGALURU COAST, KARNATAKA” | |
| dc.type | Thesis |