CATDOLL : CATDOLL: What does the fish testis consist of?

1. What does the fish testis consist of?

The fish testis is also called milt, which is mainly composed of protein and is the organ for fish to produce and store sperm. Milt contains a special protein called protamine, which is the simplest alkaline protein in nature. It is a good medicine for stopping bleeding.

2. Schematic diagram of fish morphology and structure?

The shape of the fish is streamlined, consisting of a mouth, body, fins, and tail. Please see the picture for details.

3. What is the morphology of reproductive cells at different stages of fish eggs?

Ovulation, in vitro fertilization, cell division to form an embryo

4. What are the morphological characteristics of farmed fish?

Ancient warship

The ancient warship is a very common edible fish in Southeast Asia, its country of origin, but in my country, many fish lovers also raise them as ornamental fish. Since the ancient warship is very common and widely raised in Southeast Asia, fish lovers do not have to worry about their source.

1. Appearance characteristics

The ancient warship is a super strong fish species. And it grows very quickly. It can grow very large in a very short time. So you should be careful not to keep them in a small aquarium. The aquarium should be no less than 120 cm. Otherwise, it will have an adverse effect on their growth.

2. Reproduction characteristics

The reproduction method of the ancient warship is the same as that of the Siamese fighting fish. It also lays eggs in a bubble nest. The male fish is responsible for the protection of the eggs and young fish. The young fish that have just started to swim can immediately eat larger baits such as water lice and silk earthworms due to their large size. It should not be difficult to raise them. The young fish are quite aggressive. At about 2 years old, the ancient warship reaches maturity and can reproduce the next generation. This fish has a certain aggressiveness and is too large. Therefore, it can only be raised with large fish. In the process of raising ancient warships, an albino variety appeared, which is the golden warship. It is also called the fortune-bringing fish. In addition, the scientific community has disclosed two subspecies of the ancient warship: the red-winged warship and the seven-barred warship.

5. What are the terms in fish morphology?

Fish morphology: Study the external characteristics and internal structure of fish, understand the relationship and functions of various parts, and explain the development laws of various organs.

6. Which fish (marine) have symmetrical shapes?

Generally speaking, except for the flatfish, other fish are bilaterally symmetrical.

7. Comparison of external morphological structures of different bony fishes?

The skeletons of most species of bony fish are completely ossified.

(1) The spine and ribs are similar to those of cartilaginous fish. The ribs are well developed, scimitar-shaped, and articulate with the transverse processes of the trunk vertebrae. The caudal vertebrae have no ribs.

(2) The skull bones are increased and complex, and the number of bone blocks is the largest among vertebrates.

Brain skull: Complete, composed of many bone pieces, the number of bones that make up the brain skull is more than that of any other class of vertebrates.

The skull is divided into four regions: the nasal bone region, the sphenoid bone (eye) region, the ear bone region, the occipital region, and the dorsal and ventral surfaces of the skull.

(3) The shoulder girdle of bony fish is located forward, and is composed of the scapula extending to the front and back, the coracoid on the ventral side, the supracleithrum (clavicle), and the cleithrum. The supracleithrum is fused with the posttamporal bone of the skull, forming a stable support for the head, shoulder girdle, and trunk, which increases the power of swimming. This is unique to bony fish. The basal fin bones in the paired fins of most bony fish disappear, the ray fin bones degenerate or disappear, and the dermal fin rays are often directly connected to the girdle bones.

(4) Fin bones

The odd fin of fish is closely related to the spine and is a stabilizer to prevent rolling when swimming. The bony plates of the dorsal and pelvic fins are composed of a series of base fin bones deeply buried in the body muscles and inserted into the vertebral spines or venous spines, with underdeveloped ray bones on the upper part. The upper part of each base fin bone supports a spine or fin ray. The caudal fin is the main propeller of fish when swimming. The last few caudal vertebrae are fused and tilted upward, supporting the caudal fin rays with the upper and lower vertebral arches or venous arches.

8. What is the relationship between the various morphological characteristics of fish head organs and their living habits?

Fish of this body type have slightly pointed heads and tails, thicker middle sections of their bodies, oval cross sections, and spindle-shaped side views, such as grass carp, carp, crucian carp, etc. Fish of this body type are suitable for fast swimming in still or flowing water.

9. The external appearance of tadpoles is like that of fish, but their internal structure is completely different from that of fish. Is this statement correct?

No, the opposite is true. The internal structure of tadpoles is like that of fish, but their external appearance is completely different from that of fish.