An invertebrate is an animal that does not possess a vertebral column or a backbone. Invertebrates make up the vast majority of animal species on Earth and can be found in a wide range of habitats, including terrestrial, freshwater, and marine environments. They display a diverse array of body forms, sizes, and adaptations.

Invertebrates encompass a vast group of animals, including insects, spiders, crustaceans, mollusks, worms, jellyfish, sponges, and more. They play critical roles in ecosystems as pollinators, decomposers, prey, and predators. Invertebrates have adapted to various ecological niches and can exhibit remarkable diversity in their anatomy, behavior, and life cycles.

The absence of a backbone allows invertebrates to have more flexibility in their body structure and locomotion. Instead of a vertebral column, invertebrates often have a hydrostatic skeleton, an exoskeleton, or rely on other structural elements for support and movement.

Invertebrates have a wide range of physiological systems, reproductive strategies, and feeding habits. They can be herbivorous, carnivorous, or omnivorous, and their reproductive methods can include sexual and asexual reproduction, as well as various modes of development.

The study of invertebrates is known as invertebrate zoology or invertebrate biology. Understanding the biology, ecology, and conservation of invertebrates is essential for comprehending the intricate web of life and the functioning of ecosystems.

Invertebrates in the aquarium can play a significant role in cleaning and maintaining the overall health of the ecosystem.

Algae Control: Many invertebrates, such as snails, shrimp, and certain crabs, feed on algae. They help control excessive algae growth, which can contribute to water quality issues and hinder the overall aesthetics of the aquarium.

Detritus Removal: Invertebrates like snails, shrimp, and bottom-dwelling scavengers, such as certain catfish species, are excellent at consuming organic debris and leftover food (detritus) from the aquarium substrate. This helps prevent the accumulation of waste and keeps the tank cleaner.

Substrate Aeration: Burrowing invertebrates, like certain types of freshwater clams and burrowing shrimp, can help aerate the substrate by sifting through it. This improves oxygenation and prevents the buildup of anaerobic pockets that could lead to poor water quality.

Filter Feeding: Invertebrates with filter-feeding adaptations, such as some species of shrimp and mussels, actively filter water to capture suspended particles and plankton. This helps clarify the water column and reduces particulate matter.

Pest Control: Some invertebrates, like assassin snails, can be beneficial in controlling populations of unwanted snails or other small pests that may appear in the aquarium.

It’s important to note that the effectiveness of invertebrates in cleaning an aquarium depends on several factors, including the size of the tank, the number of inhabitants, and the specific needs and behavior of the individual species. Proper research and consideration should be undertaken before adding any invertebrate to ensure compatibility with other tank inhabitants and the overall ecosystem’s balance.

Refer to the table below for invertebrate compatibility with your aquarium biome.