Category: Biology

Photofeature: Embryonic Developmental Stages of Fishes

Embryonic developmental stage of exotic grass carp (Ctenopharyngodon idella) of Bangladesh are observed through a binocular microscope. All photographs (which are given bellow) are taken with the combination of binocular microscope, DSLR camera and adapter applying own techniques.

 

Zygote, a fertilized egg

Zygote, a …read more

Category: Biology | Morphology

Photofeature: Appendages of Giant river prawn, Macrobrachium rosenbergii

Macrobrachium rosenbergii

Giant river prawn (Macrobrachium rosenbergii)

The body of Giant river prawn (Macrobrachium rosenbergii) is divided into two large parts such as cephalothorax and abdomen. Cephalothorax is consist of head and thorax.

Nineteenth pairs of appendages are found in giant river prawn. Appendages are divided into three groups according to their position of attachment. Such as- Cephalic appendage (five pairs), Thoracic appendage …read more

Category: Biology | Physiology

Respiration in Fishes

Respiration is a physiological process by which organisms exchange gases (especially intake of oxygen and releases of carbon-di-oxide),with the environment. This process is also known as external respiration. On the other hand, internal or cellular respiration means the oxidation of complex organic substances (carbohydrates or fats) within cells and tissues to form carbon dioxide and water with release of energy. (BdFISH Dictionary)

Respiration refers a physiological process by which …read more

Category: Biology | Physiology

Introduction to endocrine glands of fishes

The glands that secrete their products into the bloodstream and body tissues along with the central nervous system to control and regulate many kinds of body functions are known as endocrine gland. In fishes various endocrine gland has been found associated with different tasks and functions.

Endocrine glands of fishes: Different types of endocrine glands are found in fishes; such as-

The pituitary gland or Hypophysis Thyroid Gland Adrenal gland …read more

Category: Biodiversity | Biology | Fishes | Management | Resource | Systematics

Orange Snakehead: A new species of snakehead in Bangladesh?

Orange Snakehead: A new species of snakehead in Bangladesh?

Orange Snakehead: A new species of snakehead in Bangladesh?

Presence of numerous black spot on the bright-orange body surface of the fish makes it different from other five snakehead species in Bangladesh although the external characters are same. The external characters of the fish mostly found to be similar with Channa barca but a critical difference …read more

Category: Biology | Genetics

In situ hybridization (ISH) for gene identification and function: Part-I

Zebrafish 24 hours Stage

Fig.1a. In situ hybridization carried out in zebrafish (Danio rerio) embryo of 24 hours stage showing no gene expression as the embryo is unstained. Black arrow shows position of skeletal muscle and heart. Scale bar: 50 µm

If you want to be a …read more