shaik umme salma,aem ,mfk 1710, college of fisheries science,manglore

1. FOOD AND FEEDING HABITS OF
Labeo rohita(Ham.1822)

2. INTRODUCTION
• freshwater
• ponds
• lakes
• rivers and
streams.
HABITAT
• spindle-shaped
body.
• 1 metre - length
• weighs - 20 to
25kg
SHAPE,SIZE
• colour is blackish
on the dorsal side
• silvery on the
ventro-lateral
sides.
COLOUR

3. Kingdom : Animalia
Phylum : Chordata
Class : Actinopterygii
Order : Cypriniformes
Family : Cyprinidae
Subfamily : Labeoninae
Genus : Labeo
Species : rohita
Scientific classification

4. DISTRIBUTION
The rohu occurs in rivers throughout much
of northern and central and
eastern india,Bangladesh, Nepal and Myan
mar, and has been introduced into some of
the rivers of Peninsular India and Sri Lanka

5. omnivore
Specific food preferences at different life stages
 eats mainly zooplankton(EARLY STAGES OF LIFE CYCLE)
As it grows, eats more and more phytoplankton
 juvenile or adult is a herbivorous column feeder- eats mainly
phytoplankton and submerged vegetation
 It has modified, thin hair-like gill rakers, suggesting that it feeds
by sieving the water.
SM-2,5-spawning-mansoon
Spawn may be collected from rivers and reared in tanks and lakes
BIOLOGY

6. Paper-1

7. INTRODUCTION
The magnitude of fish population in a region is the function of food potentialities
and varies with the species, season, availability, food item preference, maturity stage
and spawning season of the fish
(Krishna et al., 2016
The qualitative and quantitative dietary analysis of fish in their natural habitats
enhances the under-standing of the growth, abundance, productivity of water body
(Nansimole et al.,
2014

8. OBJECTIVE
The present study was conducted to gather the information on
quality, quantity of food contents and feeding habit of rohu (L.
rohita) in large reservoir with reference to seasonal variation and
it would be helpful to prepare the management strategy and
policies for sustainable management of reservoir fishery.

9. MATERIALS AND
METHODS

11. RESULTS AND
DISCUSSION

14. Seasonal variation in gastrosomatic index of Labeo rohita in
Vallabhsagra reservoir

15. • Quantitative variation in food contends during the study was
observed and verified by the analysis of gastrosomatic index.
• It was minimum (3.932±0.2) during the breeding season and
maximum (5.378 ± 0.2) during the post breeding season whereas
annual mean of it was 4.537 ± 0.159.
• Result depict that during spawning season, feeding rate decreases
and increases immediately after spawning as the fish feeds
voraciously to compensate the energy loss during the breeding
(monsoon season).

16. • The seasonal changes in quality of food contents was not observed
but gut contents were dominated by phytoplankton and plant
material which indicates that fish is herbivorous

17. PAPER II

18. INTRODUCTION
Low survival rates of fish during larval stages constitute a major bottleneck in
the successful culture of many marine and some freshwater fish
Rao, 2003
A heavy larval mortality occurs especially during the time when they transit
from endogenous to exogenous mode of feeding
Labeo rohita, which accounts for 15% of the world’s freshwater aquaculture
production, reports on the feeding of rohu on natural organisms in semi-shallow
or shallow aquatic environments are few and scattered

19. OBJECTIVE
An attempt has been made to study the feeding habits
of Labeo rohita from ponds of Gho-Manhasa fish farm,
Jammu.

20. MATERIALS AND
METHODS

21. The categorization on the basis of sex was made to reveal the feeding
stratagem of animals under investigation right from larval stage to adult stage
and between males and females
The larger size groups however, were collected with the large drag net.
Labeo rohita were collected from the Gho-Manhasa fish farm ponds with the
help of mosquito net gently dragged along the sides of pond.
COLLECTION OF FISH SAMPLE

22. COLLECTION OF PLANKTON
Stereomicroscope with Reyne’s mount
Preserved in 5%of formalin
The plankton samples were collected from pond by filtering 100 litres of
surface water through silk bolting round mouth conical plankton net (50-
100μm meshsize)

23. Benthic sample

24. The preserved specimens were then brought to the wet lab measured for
their total length
The alimentary tracts were removed, weighed (nearest to 0.1grams) and
measured (nearest to 1.0 grams).
All the food items were examined using a stereomicroscope

25. Results and
Discussion

27. • A total of 420 specimens of Labeo rohita were analysed by categorizing them
into six categories based on size and sex.
• Out of total 420 specimens analysed 84 (20%)guts were found to be empty
while 336 (80%) contained food.
• Food items identified in the gut of Labeo rohita were categorized into 12 main
groups’ viz., protozoa,algae, rotifers, cladocerans, copepods, molluscs,
annelids,insects, macrophytes, unidentified matter (UM), sand/mud and detritus
• The results so obtained were used to compute percentage volume of the food
items in the gut (%V), percentage occurrence of the guts having the particular
food item (%O) and Index of Preponderance (IOP) of the food items in the gut
for L. rohita

28. Lrf I,II=40 guts Analyzed- Lrf III,IV=50 guts Analyzed- Lrf V,VI=120 guts
analyzed

30. • The low percentage of empty stomachs in Labeo rohita and high percentage of
stomach fullness recorded presently might be due to voracious feeding habit of
the fish and abundance of food in the study area.
• As a consequence of the present investigation, it was observed that early stages
of Labeo rohita feed exclusively on algae but the amount of algal intake
decreased with an increase in the size of fish.

31. • Corroborating the present observation, El Moghraby and El Rahman (1984)
categorized rohu as bottom feeder.
• Mookerjee and Ganguli (1949) described adults as herbivore and bottom
feeder.
• Moreover during the present observation, it was noticed that the plant matter
constitute a significant proportion with animal matter and detritus in the gut of
the fish thereby indicating herbi-omnivory mode of feeding of the Labeo
rohita.

33. • An increase in the feeding activity was noted in Labeo rohita (LrfV and
LrfVI) from September-December (post monsoon and early winter) with
remarkably less feeding rate from July to August (Monsoon) which
coincided with the spawning season of the species in the pond.
• Saikia et al (2013) reported Labeo rohita exhibited a greater diet breadth in
the closed area.

34. The RLG was found to increase with
the increase in plant matter
indicates a variation in the values Of RLG

35. Conclusion
• Present studies revealed L. rohita to be an omnivore-planktophage during its
early life history which subsequently showed preference for plant matter
(Herbi - omnivore)in later stages.
• The earlier research based on the gut content analysis revealed it to be a
zooplankton feeder ( Miah et al., 1984)or both a zoo and phytoplankton feeder
( Wahab et al .1994) or a periphyton feeder (NFEP 1997; Ramesh et al.1999;
Azim et al., 2001

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38. THANK U