Comprehensive Guide to Philippine Fisheries and Aquaculture
Philippine Fisheries and Global Production Context
The Philippines holds a significant position in the global aquaculture industry, currently ranking as the largest seafood producer in the world. The nation achieves this status by producing a total of of fish. The geographical landscape contributing to this productivity includes three large surrounding bodies of water: the West Philippine Sea, the Pacific Ocean, and the Celebes Sea. Within the domestic industry, traditional tools remain relevant, such as the salapang, which is a pointed blade designed to be thrown by hand, and the salakab, which are specialized cover pots.
The regulatory and developmental oversight of the industry is managed by the Bureau of Fisheries and Aquatic Resources (). A major milestone in the history of local aquaculture occurred in , which marked the official start of cultivation through the introduction of the Nile tilapia to the country. Today, fish cultivation refers to the comprehensive process of raising fish within these controlled environments.
Aquaculture Systems and Environmental Classifications
Aquaculture in the Philippines is categorized into three distinct water systems based on the salinity and movement of the water source. The freshwater system refers to the practice of raising and breeding fish in inland water sources, which can include both slow-moving and fast-moving sources. In contrast, the marine system involves the breeding and raising of fish and other aquatic organisms within seawater or saltwater environments, typically in coastal or open-sea areas. The brackish system is a specialized environment where freshwater and seawater mix, and it is used for the cultivation of species that thrive in intermediate salinity levels.
Professional Roles within the Fishery Industry
The fishery sector is supported by a diverse range of specialized professionals. An aquaculturist is a person who practices the overall cultivation and farming of various aquatic species. Supporting the technical side of operations, the fishery technician monitors and assists in the daily requirements of fish breeding and feeding. Physical maintenance of the infrastructure is handled by the fish farm caretaker, who looks after the ponds or cages, and the fish farm worker, who assists in the actual breeding and rearing of fish in ponds, cages, and nets while maintaining water quality.
Industrial maintenance is provided by the fishery repair and maintenance worker, who is responsible for boat repairs, net repairs, and general infrastructure upkeep. On the scientific and management side, the fish research officer conducts R&D regarding fish welfare and industry issues, while the fish farmer owner oversees the high-level planning, management, and coordination of hatcheries. Regulatory enforcement of fishery laws and regulations is the primary responsibility of the fisheries resources protection group. Finally, the fish distributor or trade professional serves as the vital link between the production site and the consumer, supplying the market with fish sourced from fish ponds.
Methods of Fish Cultivation and Infrastructure
Fish cultivation utilizes several types of physical structures depending on the environment and the species being raised. Fish ponds are constructed in various ways, with two common types being the earthern fish pond and the concrete pond. Earthern ponds are controlled environments created by digging into the soil at a desired depth and area, whereas concrete ponds are built above ground with the bottom covered in a concrete floor, a method commonly used for farming catfish and tilapia.
In lake environments, fish pens are frequently used. This method requires the use of nets, often utilizing bamboo for the posts and braces; it is favored for being inexpensive and easy to manage. Cage culture is a method used primarily in coastal or marine areas. This involves floating cages where nets are installed and suspended from the surface to the bottom to contain the fish.
Culture Intensity and Stocking Densities
The intensity of a fish farm is determined by its stocking density and its reliance on external inputs. The extensive culture method is characterized by a stocking density of per hectare. In this system, the fish are solely dependent on the natural aquatic organisms already present in the pond for nutrition. The semi-intensive culture method involves a higher stocking density of between and fry. The feed sources for this method are split between natural feeding and supplementary feeding provided by the farmer.
The most resource-intensive approach is the intensive culture method. This is the most expensive system of fish culture as it requires sophisticated and costly water management systems. In this method, the fish are completely dependent on artificial formulated feeds rather than natural pond organisms.
Fish Propagation Techniques
Fish propagation refers to the various methods used to breed fish, which are categorized into three distinct processes. Natural propagation occurs when male and female fish are placed together in a designated breeding area, such as a tank, where they spawn naturally without further intervention. Semi-natural propagation involves a higher level of intervention where the female fish is given an injection of a chemical, such as pituitary gland extract, to induce the spawning process. After the injection, they are placed in an enclosed area until spawning occurs.
Artificial propagation is the most technical method, wherein female fish are given one or more chemical injections to induce the ripening of dormant eggs within the ovaries. These eggs are then harvested and artificially fertilized with sperm obtained from the male fish, rather than allowing the fish to spawn on their own.
Conservation and Habitat Categories
Fish conservation involves the strategic planning, management, and protection of fish populations and their natural habitats to ensure sustainability. A key tool in this effort is the fish sanctuary, a body of water where fisheries are protected and managed. These are typically government-designated areas in the ocean where all fishing activities are prohibited.
Fish habitats are generally classified into three categories, with specific native species adapted to each. The mudfish, also known as dalag, is known to live in muddy pools, ponds, and streams across the country. The catfish, or hito, thrives well in swamps and streams; a notable characteristic of this fish is that it reaches a length of approximately when it is between and months old. Additionally, the gourami is a popular native fish frequently found in rice paddies, with the giant gourami being a particularly well-known variety within this group.