Bony fishes are

Options

A. Marine
B. Fresh water dwelling
C. Estuary dweller
D. Both (1) &(2)

Answer

### Step-by-Step Text Solution:

1. **Definition of Bony Fishes**:
Bony fishes, scientifically known as Osteichthyes, are a class of fish characterized by a skeleton primarily made of bone rather than cartilage. This structural composition is the key feature that distinguishes them from other types of fish, such as cartilaginous fishes (e.g., sharks and rays).

2. **Composition of Skeleton**:
The skeleton of bony fishes is composed of bones, which provide a rigid structure that supports their body and protects vital organs. This bony structure allows for greater flexibility and movement compared to cartilaginous fishes.

3. **Examples of Bony Fishes**:
Common examples of bony fishes include species like salmon, trout, goldfish, and tuna. These fish exhibit a wide variety of shapes, sizes, and adaptations to different aquatic environments.

4. **Habitat and Distribution**:
Bony fishes are found in both freshwater and marine environments. They inhabit a range of habitats from rivers and lakes to oceans and coral reefs, showcasing their adaptability.

5. **Physiological Features**:
Bony fishes typically possess a swim bladder, an air-filled organ that helps them maintain buoyancy in the water. They also have gills covered by a bony plate called an operculum, which aids in respiration.

6. **Reproductive Strategies**:
Most bony fishes reproduce by external fertilization, where eggs and sperm are released into the water. However, some species exhibit internal fertilization and parental care.