easy way to understand for oil sardine

2. INFORMATION:-
FORMS SCHOOL IN COSTAL WATERS.
STRONGLY MIGRATORY
FEED ON PHYTOPLANKTON AND
ESPECIALLY DIATOMS .
BREED ONCE A YEAR OFF WESTERN
COAST OF INDIA WHEN
TEMPERTURES AND SALINITY ARE
LOW


4. FROM THE GULF OF ADEN TO
SOUTHEAST INDIA AND POSSIBLY THE
ANDAMAN ISLAND .
IT IS NOT FOUND IN THE RED SEA OR
PERSIAN GULF
 MOSTLY FOUND IN INDIAN OCEAN.

5. DORSAL SPINES (total) : 0 ,
DORSAL SOFT RAYS (total)13 -21
ANALSPINES -0
VERTEBRAE -45 TO 49

6. MAXIMUM SIZE :- 230 mm SL

7. PELAGIC SPECIES
FOUND IN PHOTIC ZONE
DEPTH OF 20200m along the contiental
shelf

8. OIL SARDINES ARE HTEROSEXEXUAL .
THE SEXUAL MATURITY ATTAINED IN 1
YEAR AND 150mm.
USUALLY FEMALE ARE BIGGER THAN
MALE
EGGS ARE PELAGIC WITH CLEAR OIL
GLOBULE .
 ON EAST COAST SPAWNING OCCURS
BT FEB AND TILL JUNE ,PEAK SEASON
FEB AND APRIL.

9. IN WEST COAST FROM MARCH TO
JUNE
FECUNDITY:- GONADS ARE
ASYMMETRICAL LOBE IN SARDINES
AND LEFT LOBE IS LARGER THAN THE
RIGHT ONE.
OVERALL AVERAGE OF 37000 -38000.

10. SEX RATIO:- FEMALE ARE TWICE IN
NUMBER.
THE MATURE FEMALE MIGRATES
OFFSHORE WATER FOR THE
BREEDING.