Fish have jelly-like eggs, called roe. They mostly use external fertilization, where males fertilize the eggs outside the female’s body. Some species may have internal fertilization. Egg types vary by species, and certain types, like caviar, are edible and desired by humans for consumption. The fertilization process can occur outside the female’s body or internally, … Read more

Fish do not have calcified eggs. They lay eggs that are surrounded by extraembryonic membranes, which protect the developing embryo. These eggs do not have a hard or soft shell. Like amphibians, fish produce gelatinous egg clutches. These clutches absorb water and create a suitable environment for embryo development. The anatomy of fish eggs varies … Read more

Ray-finned fishes do not have amniotic eggs. Amniotic eggs are found in amniotes like mammals, birds, and reptiles. In contrast, ray-finned fishes and other non-amniotes, such as sharks and amphibians, lay eggs without the protective amniotic membrane. This membrane aids in adaptation to terrestrial environments. Understanding the differences between these reproductive methods highlights key aspects … Read more

Fish do not have amniote eggs and are classified as anamniotes. Anamniotes lay eggs without a protective membrane called the amnion. In contrast, amniotes, which include reptiles and mammals, lay shelled eggs that protect the embryo, allowing them to reproduce on dry land. Fish embryos depend on water for their protection. Fish are classified into … Read more

Fish have a notochord during their embryonic stage. This structure is replaced by bony vertebrae as they develop. Therefore, adult fish do not have a notochord. This change is typical in vertebrates, which include amphibians, reptiles, birds, and mammals, all of which belong to the subphylum Vertebrata. Morphological studies of Atlantic salmon reveal that the … Read more

Some fish, like dwarf corydoras and many cichlids, do not eat their own eggs or fry. Other fish, such as catfish and loaches, may consume eggs. Fish behaviors depend on species, revealing that some dislike eggs while others view them as food. Nature balances these dietary habits within underwater ecology. On the other hand, some … Read more

Most fish reproduce by laying eggs that are fertilized outside their bodies. Pelagic fish lay their eggs in open water. Shore and freshwater fish usually place eggs among plants or on the bottom. Some species, like certain sharks, give live birth. Adhesive eggs help increase survival in different environments. Some fish, however, are viviparous and … Read more

Yes, fish can get stuck in sea caves. During high tides or storms, some species may become trapped. They often adapt to living in caves for protection or breeding. Common examples include rockfish and gobies, which use caves as shelters in their marine environments. This behavior highlights their survival strategies in marine ecology. Underwater plants … Read more

Fish mainly lay eggs instead of getting pregnant. Most species release many small eggs that are fertilized outside their bodies. Pelagic fish drop eggs in open water. In contrast, shore and freshwater fish spawn on the ground or among plants, which increases the chances of the eggs surviving. Breeding occurs during specific seasons when conditions … Read more

Fish get omega-3 fatty acids from algae and plankton in the sea. They do not produce omega-3; instead, they obtain it through their diet. Fatty fish like salmon, mackerel, and sardines are rich in omega-3. Eating two servings of these fish each week supports heart health and provides important health benefits. The health benefits of … Read more