Carotenoid profiles in relation to maturation, Moulting, food and habitat in the Indian spiny Lobster Panulirus homarus (Linnaeus, 1758) (TH 113)

Antony, Mary Asha (2003) Carotenoid profiles in relation to maturation, Moulting, food and habitat in the Indian spiny Lobster Panulirus homarus (Linnaeus, 1758) (TH 113). PhD thesis, PGPM, Central Marine Fisheries Research Institute.

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Abstract

Carotenoids are responsible for natural pigmentation in crustaceans. The changes in the amount and redistribution of carotenoid pigments in crustaceans depend on several factors including sexual cycle, moulting, food and habitat. Carotenoid changes in Panulirus homarus were studied during thc premoult, postmoult and intermoult stages. Highest carotenoid concentration was recorded in the premoult stage (774I.1g/g in hepatopancreas, 725I.1g/g in the exoskeleton and 133 I.Ig/g in the muscle). During postmoult stage the carotenoid concentration was lowest. Moulting accounted for 66% loss in carotenoid pigments. Astaxanthin levels were high in premoult stage in the exoskeleton and the hepatopancreas. During postmoult stage there was a sharp decrease in astaxanthin concentration in these tissues. Significant differences in carotenoid concentration were recorded in different tissues during ovarian maturation. The carotenoid levels were low in the immature ovary (128I.1g/g) and in the fully mature ovary the concentration increased to 512I.1g/g. The increase in carotenoid concentration of the ovary coincided with a decrease in carotenoid concentration of hepatopancreas and increase in carotenoid concentration in the exoskeleton. Spent stage was characterized by decrease in carotenoid content in the ovary, hepatopancreas and exoskeleton. Astaxanthin was found to accumulate in the hepatopancreas during early maturation and during vitellogenesis they were mobilized to the ovaries. Different naturally occurring carotenoids were studied for their effect on pigmentation of P. homarus. Among the four feeds (Donax cuneatus, Perna viridis, Metapenaeus dobsoni, Paphia malabarica) used P. homarus fed on M. dobsoni and green mussel P. viridis had the best pigmentation pattern. The least pigmented lobsters were those fed on D. cuneatus. D. cuneatus was enriched with Spirulina and Haematococcus pluvialis and these were offered as food to P. homarus. The results revealed that pigmentation of P. homarus can be increased by enriched feed. Enrichment studies revealed that Spirulina enriched clams were superior to clams enriched with H. pluvialis when used as feed for P. homarus. The study on the influence of habitat on pigmentation pattern revealed that in captive conditions the colour of rearing tanks had a direct influence on pigmentation pattern. Among the four different colored tanks used in the study (blue, black, translucent and white) lobsters reared in black coloured tanks had the best pigmentation pattern.

Item Type:Thesis (PhD)
Supervisor(s):Vijayakumaran, M
Uncontrolled Keywords:Carotenoid profiles; maturation; Moulting; food and habitat; Indian spiny Lobster; Panulirus homarus
Subjects:Theses
Crustacean Fisheries > Lobsters
Divisions:CMFRI-Cochin > Marine Capture > Crustacean Fisheries
ID Code:7164
Deposited By:Dr. V Mohan
Deposited On:28 Jan 2011 16:47
Last Modified:20 Jan 2014 12:36

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