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Feeding habits of milk shark, Rhizoprionodon acutus (Ruppell, 1837) in the Gujarat coastal waters of north-eastern Arabian Sea

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Relation http://eprints.cmfri.org.in/12631/
https://www.sciencedirect.com/science/article/pii/S235248551630278X
 
Title Feeding habits of milk shark, Rhizoprionodon acutus (Ruppell, 1837) in
the Gujarat coastal waters of north-eastern Arabian Sea
 
Creator Dash, Swatipriyanka Sen
Chakraborty, S K
Vivekanandan, E
Zacharia, P U
Jaiswar, A K
Dash, Gyanaranjan
Bharadiya Sangita, A
Gohel, Jayashree
 
Subject Shark fisheries
Food and Feeding
 
Description The feeding habit of milk shark Rhizoprionodon acutus was investigated in 684 specimens collected along
Gujarat coast (India) of north-eastern Arabian Sea from January 2013 to December 2014. The length range
of females was 32–89.6 cm and males 33.5–89 cm. The shark foraged on diversified prey items which
were pooled into four distinct groups i.e., teleosts, crustaceans, mollusks and annelids. Teleosts (Dietary
coefficient, %QI = 83.05 and index of relative importance, %IRI = 78.40) were found to be the preferred
food items followed by crustaceans (%QI = 16.21; %IRI = 19.78), which formed the secondary food item
group. Mollusks (%QI = 0.74; %IRI = 1.69) and annelids (%QI = 0.01; %IRI = 0.14) constituted the
accidental or accessory food items. The species, though is a pelagic predator, probably performs vertical
movements in search of prey items. The shark also showed some sorts of preference and selectivity for
clupeids, engraulids and carangids. Females though showed significantly lower index of relative fullness
(IRF) (P ≤ 0.5) and comparatively lower vacuity index and lower mean number of preys per stomach
compared to the males, the preference for prey items was not found to be significantly different between
the females and males. Juveniles were found to have significantly higher IRF (P ≤ 0.5) and comparatively
higher vacuity index than that of the adults, whereas the mean preys per stomach was found to be
lower than that of the adults. Moreover, the prey preference was also significantly different between the
juveniles and adults. The study provides necessary baseline information about the feeding habits of the
shark in the region which will be helpful in understanding the trophodynamics of the species under the
influence of overfishing and climate change.
 
Publisher Elsevier B.V.
 
Date 2018
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/12631/1/Swatipriyankasen%20Dash_2018_Regional%20Studies%20in%20Marine%20Science_Feeding%20habits%20of%20milk%20shark.pdf
Dash, Swatipriyanka Sen and Chakraborty, S K and Vivekanandan, E and Zacharia, P U and Jaiswar, A K and Dash, Gyanaranjan and Bharadiya Sangita, A and Gohel, Jayashree (2018) Feeding habits of milk shark, Rhizoprionodon acutus (Ruppell, 1837) in the Gujarat coastal waters of north-eastern Arabian Sea. Regional Studies in Marine Science, 17. pp. 78-86.