Author of the drawing: Alessio Marrucci.

Chinese River Dolphin or Baiji Dolphin

(Lipotes vexillifer)

Introduction

There are quite a few different names that you may here the Baiji Dolphin called. They include the Chinese River Dolphin and the Goddess of the Yangtze. In some areas they are also referred to as the Whitefin Dolphin, but it is one and the same. They can sometimes be confused though with the Chinese White Dolphin that is separate.

Description

The Baiji Dolphin features a streamlined body that makes it easy for them to swim well but not to exert too much energy. The flippers are round and they have a snout that is turned upward at the end like a beak. They don’t have any hair on them at all. The eyes are small and they are sitting higher on the head then for other species. They are a light bluish gray color and have white on the belly. Each side of the mouth may have 30 to 36 teeth, and they feature them both on the lower and upper jaw regions.

They are one of the few species of dolphins that don’t have two stomachs. However, the main stomach that they have is divided into three chambers. They can be up to 8 feet long and weigh as much as 500 pounds. The females tend to be longer and heavier than the mature males.

Distribution

The Baiji Dolphin is one of four species that can live in freshwater. They are found in the Yangtze River of China. They don’t have a very diversified habitat which is why it is so important for efforts to be put in place and carried out to help ensure their survival.

Behavior

There isn’t much known about the overall behavior of this dolphin in the wild. It is believed that they spend a great deal of time underwater to help with communication and orientation. They also are able to use clicks and whistles for communication.It is believed they don’t live in large pods but rather in pairs of 2 or up to 10.

They are social and they seem to form deep bonds with each other. They spend most of their time at night resting in areas that offer them a slow moving current.They are known to be shy compared to other species of dolphins. That has always made it hard to observe them at any close range or for long periods of time.

Feeding

The diet for the Baiji Dolphin mainly consists of various types of fish. Almost all of their feeding efforts will take place during the day. The long beak of the Baiji Dolphin allows them to find food sources at the bottom of the muddy waters. They only dive for about 10 to 20 seconds at a time.

They don’t have very good vision but they make up for it with their echolocation to help them find food in the water. They tend to find their food sources mainly around the shallow water locations. These tend to be located around the mouth of the tributaries of the river or close to the sand bank locations.

Reproduction

There is little really known about the reproduction efforts of these dolphins in the wild. It is believed that they mate any time from the first half of the year. It takes from 10 to 11 months after mating for the calf to arrive. They may be up to 3 feet long when they are born. The average age for mating to begin ranges from 4 to 6 years.

The mothers will keep the calves very close to them and forge a powerful bond. There isn’t any information about how long the young will drink milk from her body before being weaned. It is believed to be from 12 to 18 months though as that is the standard time frame for all of the other species of dolphins.

Conservation Status and Threats

The number of Baiji Dolphins in China significantly declined due to heavily industrialization efforts. The river where these dolphins live began being used for commercial fishing, hydroelectricity to be produced, and for transportation needs. In spite of the conservation efforts that were put into motion, they haven’t been a success.

Commercial fishing efforts resulted in large numbers of them being captured and killed. They were either too severely injured in the nets to survive or the drown as they couldn’t surface for air. Other accidents were the result of these dolphins coming into contact with the propellers of boats in the water. This dolphin is also one that was hunted heavily for the meat it offered as well as the flesh to be used as bait for a variety of fishing operations.

Legal efforts by China were implemented in 1975 to protect the Baiji Dolphins. However, problems with heavy pollution in this body of water made it extremely hard for the plans to re-introduce dolphins to the location. In 1992 part of the Yangtze River was preserved for them but it was too late for them to rebound due to the low numbers they had already been depleted to.

As of 2006 no more of them have been seen. They are now classified as being functionally extinct. This is the first aquatic mammal to be added to that list since the 1950s when the Caribbean Monk Seal and the Japanese Sea Lion were identified with the same fate.In the later part of 2007, a man in China reported that he had seen what he thought was a Baiji Dolphin. He even created a video recording of it swimming in the Yangtze River. The results of evaluating it are believed to be evidence that there are some of them remaining.

However, there isn’t enough evidence of a population to believe that any conservation at this efforts would be sufficient enough to prevent the population from eventual extinction. There are those living in captivity that do well. There are some plans in the works to identify those that do remain in the wild and to relocate them to preserves. They can live up to 25 years.

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