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Hatchability Problem of Ex-situ Conservation of the Freshwater Crocodile Crocodylus Palustris (lesson 1831) at Dulahazra Safari Park, Cox's Bazar, Bangladesh

Amir Hossen
Department of Biology, Norwegian University of Science and Technology, Norway.

M. Farid Ahsan
Department of Zoology, University of Chittagong, Bangladesh.

Mohammad Kamruzzaman
Center for Environmental and Geographic Information Services (CEGIS), Dhaka, Bangladesh.

Abstract/ Executive Summary:

In this research hatchability problems of freshwater crocodile in Dulahazra Safari Park have been discussed. The findings focused on meteorological factors, lack of suitable habitat in semi-captive enclosures and some physiological factors which are mainly responsible for non-hatchability of freshwater crocodile in the park environment. The research emphasized on finding rationale that interrupts breeding failure of this crocodile in this park. The hatchability problem was identified with some influential factors which are main barriers to escalate and proliferate the reintroduce program in Bangladesh. The findings showed that the influential factors including high stock density in a small space, low water deepness and narrow sandy bank of the enclosure with lack of nesting materials, high temperature and heavy rainfall are mainly responsible for the failure of freshwater crocodile breeding potentiality.

Keywords: Hatchability, Incubation, Courtship, Clutch, Stock, Viability

Location: Dulahazra Safari Park at Cox's Bazar

Start Date: 00-06-2007

End Date: 00-05-2008

Program Area: Animal Health and Management

Commodity: Crocodile

Objectives:

To restore and establish freshwater crocodile population in nature under reintroduction program.

Methodology:

Freshwater crocodile breeding activities were observed in semi-captive Lake of Dulahazra Safari Park at Cox's Bazar during June 2007 to May 2008 and the data were recorded through frequent field visits. In addition, during the crocodile introduction in May 2004, breeding related data of freshwater crocodile (Crocodylus palustris) in Dulahazra Safari Park were collected from park staffs, officers and recorded documents. The list of the materials included note book, pen, pencil, eraser sharpener, a pair of binoculars (Bushnell, 10 x 50 coated lens), measurement tape, spring balance, a pair of scissors, thermometer (maximum-minimum), calculator, alcohol and formalin, protective cloth, jungle boot and sunglass, hand gloves, torch light, polythene bags, first aid box, etc. Courtship, pair formation, and mating behavioral activities were noted including specific time of breeding season. Nest sites were marked and the length and breadth of nests were measured along with counted nest number. The nests materials were also identified during the field investigation. The egg laying time and clutch size were recorded to compare with previous egg laying time and clutch sizes. Randomly, the weight and length of ten eggs were taken to find out the reason of hatchability problem. The incubation period was recorded to compare with the length of previous incubation period. Weather related data including temperature, humidity and rainfall were also recorded. The data were analyzed statistically where needed.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 41(2): 155-161, December 2015

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The findings showed that the influential factors including high stock density in a small space, low water deepness and narrow sandy bank of the enclosure with lack of nesting materials, high temperature and heavy rainfall are mainly responsible for the failure of freshwater crocodile breeding potentiality.

Knowledge Management: Journal