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(Setipinna phasa), Boiragi (Coilia dussumieri), investigation on the rigor mortis progress of Rohu
Bistra (Scatopihagus argus), Tular dandi (Labeo rohita) and Mrigal (Cirrhinus cirrhoscs) of
(Sillanopsis panijus), Tapashi (Polynemus different sizes (small, medium and large) was
paradiseus), Chat baila (Platicephalus indicus) and carried out at Fish Quality Control Lab of Khulna
Kankon (Pelamys chiliensis) ranged from 3.1 to University in December, 2006. A total of 30
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8.2 × 10 cfu/g while the remaining samples Parshe individuals, 15 of Rohu and 15 of Mrigal were
(Mugil cephalus). Gang tengra (Arius caelatus), taken for the study. The continuous rigor mortis
and Ilish (Hilsa ilisha) showed a SPC of 1.08 to progress was assessed by the rigor index value and
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3.1 × 10 cfu/g. Total coliform count for nine duration of onset and resolution of rigor mortis was
species were in the range of 7 to 43 MPN/g. Only, also observed. In case of all sizes of Rohu, rigor
Bistra had 210 MPN/g. Faecal coliform count for started within 1 hour after death. The small size
th
Boiragi, Bistra. Hish. Chat baila and Kankon were Rohu attained full rigor after 4 hour of death
21, 93, 20, 11 and 15 respectively and Parshe, whereas medium and large size attained full rigor
th
th
Tular dandi and Gang tengra showed faecal after 5 and 6 hour after death respectively.
coliform load of 9 MPN/g while, Phasa and Duration of full rigor was 5, 6 and 7 hour for
Tapashi showed faecal coliform of 4 and < 3 small, medium and large size accordingly.
MPN/g respectively. The organoleptic properties Maximum rigor index was attained as 84.2%,
of ten dried fish samples were of better quality 85.8% and 86% by small, medium and large size
except for Churi (Trichuirus haumela) and respectively. Small size Rohu relaxed completely
th
Saplapata (Himantura walga). Amongst the ten after 17 hour while medium and large relaxed
th
dried fish, three (Loytta, Gang Tengra and Phasa) completely after 18 hour. In case of all sizes of
showed standard plate count (SPC) of 4.23-7.8 × Mrigal, rigor started within I hour after death. Both
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3
10 cfu/gm, five contained 3.2-6.07 × 10 cfu/gm, the small and medium sized Mrigal attained full
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while the remaining two samples (Shaplapata and rigor after 4 hour after death whereas large size
th
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Churi) had SPC' of 2.26 × 10 and 2.77 × 10 attained full rigor after 5 hour after death.
cfu/gm, respectively. Total coliform count for six Duration of full rigor was 5 hour for both small
samples were <3/gm. The count for remaining four and medium sizes and 6 hour for large ones.
samples were 4/gm. Faecal coliform count of all Maximum rigor index was attained as 84.4%,
samples were <3/gm. No Vibrio chlorae and 84.6% and 85.2% by small, medium and large
Salmonella were detected in any sample. sizes respectively. Small sized Mrigal relaxed
th
completely after 16 hour while medium and large
520 ALI, M.Y.; MOYADUZZAMAN, M.F.; th th
RAHI, M.L. & ISLAM, M.B. (Fisheries & relaxed completely after 17 and 18 hour
Marine Resource Technology Discipline, Khulna respectively. For all sizes, Mrigal developed and
University, Khulna). Variation in Rigor Progress of passed through rigor faster than Rohu. Both in
Rohu (Labeo rohita) and Mrigal (Cirrhinus Rohu and Mrigal small size fish went into and
passed through rigor more quickly than medium
cirrhosus) in Relation to Size. South Asian J.
Agric., 2007, 2( 1 & 2), 33-38. and large ones.
Information on the rigor mortis progress of Indian 521 AMIN, M.N. (Rural Development Academy,
major carps in relation to storage conditions is Bogra). Status of fish broodstock management and
available in Bangladesh but few works have been seed production in Bangladesh. Bang. J. Fish. Res.,
done on the effect of size in rigor mortis. An 2005, 9 (1), 15-16.
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