There are only two sightings of Pseudorca crassidens have been reported: first one with about 30 individuals in the Swatch of No-ground in 2011, and second one with about 40 individuals in the offshore south of S. Martin's Island in 2012. One carcass was reported in the Daily Azadi newspaper of Chittagong on 28 December, 2010. There is no information available on its population size, threats or population trend. Thus, the species has been assessed as Data Deficient.

Throughout the distribution range, this species is facing a high risk of human impact, destruction of natural forests and daming of upper reaches of all trans-boundary rivers in the neighbouring countries that is causing massive siltation in all floodplain rivers. There has been a dramatic decline in the Extent of Occurrence, as well as habitat quality, especially in the Ganges (IWC, 2000) and Brahmaputra River basins, which is related to the construction of barrages in the upstream countries (M A R Khan pers. comm). The species has also disappeared from most of the tributaries of GangesBrahmaputra-Meghna river systems due to siltation, insufficient water flow. So, it is now restricted to a few larger channels (pers. obs.). It is assuming that at least 30% decline of population has occurred during last three generations with the decline in its habitat and incidental catch in drag net. Based on the ongoing threats, fragmentation of the population, the species has been assessed as Vulnerable.

There is no record of Sperm Whale occurrence in Bangladesh except one carcass that was found in 22 November, 2007 at the Selarchar of Sundarbans East Wildlife Sanctuary in the southern coast of Bangladesh (The Daily Purbanchal, 28 November 2007 and The Daily Star, 30 November 2007) that was brought ashore by the tidal surge Sidr that badly impacted Bangladesh western coast. No more information is available to assess this species. Thus it is categorized as Data Deficient.

The species is mostly found in freshwater affected coastal waters and waterways of the Sundarbans in a large range. The Extent of Occurrence and the Area of Occupancy of this species is much higher than the threshold level. The population size is 451 individuals (3.4% calves) in the Sundarbans (Smith et al. 2006) and 5,383 individuals in coastal waters in the Bay of Bengal (Smith et al. 2008). It does not fulfill any of the criteria to qualify threatened categories but based on its existing threats, it has been categorized as Near Threatened.

This species is found in brackish water in the Sundarbans mangrove swamps, coastal and marine waters of the Bay of Bengal. No population size reduction or decline is known. Its Extent of Occurrence is 25,237 km2 (>20,000 km² threshold) and Area of Occupancy is 14,344 km2 (extremely higher than 2,000 km² threshold). Total population size is 1,382 individuals (number of calf is unknown) in coastal waters in the Bay of Bengal (Smith et al. 2008) which is larger than the threshold level. It does not fulfill any of the criteria to qualify threatened categories this species has been categorized as Near Threatened based on its existing threats.

In February 1985, a 13.7 meter long carcass of Balaenoptera sp. was found in the south coast of Cox's Bazar (Sarker 1990). Carcass of Brydes Whale was also found at Mandarbaria on the southwest coast of the Sundarbans in February 2008, and another carcass was found at coast of Barguna district in March 2014. During December 2006 to February 2007, forty sightings of Balaenopterids occurred in and arround the Swatch of No-ground with mean 2.9 individuals (range 1-15) of which six were confirmed Bryde's Whale sightings from photo identification (Smith et al. 2008a). Thus, Bryde's Whales are believed to be distributed throughout the offshore in the Bay of Bengal but there is no estimation of its population size as well as population trends. Thus, this species has been categorized as Data Deficient.

This species is uncommon and now restricted mainly to the northwestern part of Bangladesh, and a small population in the border of Moulvibazar. The frequencies of sighting (index of relative abundance) has declined in the past and is being declining ever more rapidly due to retribution killing by villagers. It used to occur widely in Bangladesh but that range has now become quite restricted. So the Extent of Occurrence and Area of Occupancy have declined. Therefore, it qualifies for Vulnerable category.

Though this species is widely distributed in a diverse habitat throughout Bangladesh but the population has been declining due to different anthropogenic factors. Hunting, poaching and retribution killing of this species for attacking poultry and pigeon coop is also evident. Its countryside habitat is being continuously destroyed. This species does not fulfill any of the criteria for threatened categories. Therefore, this species has been categorized as Near Threatened based on its threats.

Though this species is widely distributed in diverse habitats, the population has been declining due to retribution killing, hunting for meat, road-side killing and other anthropogenic factors. It has been categorized as Near Threatened based on its level of threats.

There is no exact data on population size reduction but due to continuing extreme threats and known presence of just a handful of specimens in disjunct populations and the population has been reducing drastically and it is suspected that more than 80% population has been declined. Thus, this species has been categorized as Critically Endangered.