By Elizabeth Gill
Geographic Range
Bryde's whale is found throughout the world, primarily in warm temperate and sub-tropical waters.
Biogeographic Regions:
ethiopian
(native
); neotropical
(native
); indian ocean (native
); atlantic ocean
(native
); pacific ocean
(native
).
Habitat
Populations exist mainly in warmer waters (~20 degrees Celcius). More research needs to be done on this topic.
Aquatic Biomes:
coastal
.
Physical Description
(26400 to 44000 lbs; avg. 35200 lbs)
Bryde's whales are dark gray in color with a yellowish white underside. They are the second smallest rorqual with an average length of 12 meters, although the female is usually about 1 foot longer than the male. Bryde's whales have two blowholes located on the top of the head. Bryde's whale is often confused with the Sei whale; however, the Bryde's whale has three parallel ridges in the area between the blowholes and the tip of the head. The flippers are small compared to body size. The prominent dorsal fin is sickle shaped. Instead of teeth, these whales have two rows of baleen plates. These plates are located on the top jaw and number approximately 300 on each side. Each baleen plate is short and wide, 50cm x 19cm.
Some key physical features:
endothermic
; bilateral symmetry
.
Reproduction
Breeding occurs year round in Bryde's whales
Breeding occurs year round in Bryde's whales. Sexual maturity is reached at 10 years of age for males and 8 years of age for females. The gestation period is approximately 12 months. Most Bryde's whales bear 1 calf. Calves are around 4 meters at birth and weigh 1 ton.
Key reproductive features:
iteroparous
; year-round breeding
; gonochoric/gonochoristic/dioecious (sexes separate); sexual
; viviparous
.
Behavior
Bryde's whales are seldom seen in large groups but will congregate around dense populations of food. They are deep divers. The lobes of either side of the tail (flukes) are seldom shown. Swimming speed ranges between 4 - 16 knots. Some tropical populations are possibly sedentary with short distance migrations. More research needs to be done on the behavior of Bryde's whales.
Key behaviors:
natatorial
; motile
; migratory
; sedentary
; social
.
Food Habits
Bryde's whales feed almost exclusively on pelagic fish (pilchard, mackerel, herring, and anchovies) and pelagic crustaceans (shrimp,crabs, and lobsters). They also have been observed to eat cephalopods (octopus, squid, and cuttlefish).
Animal Foods:
fish; mollusks; aquatic crustaceans.
Foraging Behaviors:
filter-feeding
.
Conservation Status
Some populations were seriously depleted as a result of whaling practices. Bryde's whales are not on the Endangered species list. As a result of the 1986 Moratorium on Whaling, they are protected worldwide.
Contributors
Elizabeth Gill (author), University of Michigan.
Phil Myers (editor), Museum of Zoology, University of Michigan.
