What is Fishery?

Legal Definition
Generally, a fishery is an entity engaged in raising or harvesting fish which is determined by some authority to be a fishery. According to the FAO, a fishery is typically defined in terms of the "people involved, species or type of fish, area of water or seabed, method of fishing, class of boats, purpose of the activities or a combination of the foregoing features". The definition often includes a combination of fish and fishers in a region, the latter fishing for similar species with similar gear types.

A fishery may involve the capture of wild fish or raising fish through fish farming or aquaculture. Directly or indirectly, the livelihood of over 500 million people in developing countries depends on fisheries and aquaculture. Overfishing, including the taking of fish beyond sustainable levels, is reducing fish stocks and employment in many world regions. A report by Prince Charles' International Sustainability Unit, the New York-based Environmental Defense Fund and 50in10 published in July 2014 estimated global fisheries were adding $270 billion a year to global GDP, but by full implementation of sustainable fishing, that figure could rise by as much as $50 billion.
-- Wikipedia
Legal Definition
Estates. A place prepared for catching fish with nets or hooks. This term is commonly applied to the place of drawing a seine, or net. 1 Whart. R. 131, 2.

2. The right of fishery is to be considered as to tide or navigable waters, and to rivers not navigable. A river where the tide ebbs and flows is considered an arm of the sea. By the common law of England every navigable river within the realm as far as the sea ebbs and flows is deemed a royal river, and the fisheries therein as belonging to the crown by prerogative, yet capable of being granted to a subject to be held or disposed of as private property. The profit of such fisheries, however, when retained by the crown, is not commonly taken and appropriated by the king, unless of extraordinary value, but left free to all the people. Dav. Rep. 155; 7 Co. 16, a: Plowd, 154, a. Within the tide waters of navigable rivers in some of the United States, private or several fisheries were established, during the colonial state, and are still held and enjoyed as such, as in the Delaware. 1 Whart. 145, 5; 1 Baldw. Rep. 76. On the high seas the right of fishing jure gentium is common to all persons, as a general rule. In. rivers, not navigable, that is, where there is no flux or reflux of the tide, the right of fishing is incident to the owner of the soil, over which the water passes, and to the riparian proprietors, when a stream is owned by two or more. 6 Cowen's R. 369; 5 Mason's R. 191; 4 Pick. R. 145; 5 Pick. R. 199. The rule, that the right of fishery, within his territorial limits, belongs exclusively to the riparian owner, extends alike to great and small streams. The owners of farms adjoining the Connecticut river, above the flowing of the tide, have the exclusive right of fishing opposite their farms, to the middle of the river although the public have an easement in the river as a public highway, for passing and repassing with every kind of water craft. 2 Conn. R. 481. The right of fishery may exist, not only in the owner of the soil or the riparian proprietor, but also in another who has acquired it by grant or otherwise. Co. Litt. l22 a, n. 7; Schul. Aq. R. 40 41; Ang. W. C. 184; sed vide 2 Salk. 637.

3. Fisheries have been divided into: 1. Several fisheries. A several fishery is one to which the party claiming it has the right of fishing, independently of all others, as that no person can have a coextensive right with him in the object claimed, but a partial and independent right in another, or a limited liberty, does not derogate from the right of the owner. 5 Burr. 2814. A several fishery, as its name imports, is an exclusive property; this, however, is not to be understood as depriving the territorial owner of his right to a several fishery, when he grants to another person permission to fish; for he would continue to be the several proprietor, although he should suffer a stranger to hold a coextensive right with himself. Woolr. on Wat. 96.

4. - 2. Free fisheries. A free fishery is said to be a franchise in the hands of a subject, existing by grant or prescription, distinct from an ownership in the soil. It is an exclusive right, and applies to a public navigable river, without any right in the soil. 3 Kent, Com. 329. Mr. Woolrych says, that sometimes a free fishery is confounded with a several, sometimes it is said to be synonymous with common, and again treated as distinct from either. Law of Waters, &c. 97.

5. - 3. Common of Fishery. A common of fishery is not an exclusive right, but one enjoyed in common with certain other persons. 3 Kent, Com. 329. A distinction has been made between a common fishery, (commune piscarium,) which may mean for all mankind, as in the sea, and a common of fishery, (communium piscariae,) which is a right, in common with certain other persons, in a particular stream. 8 Taunt. R. 183. Mr. Angell seems to think that common of fishery and free fishery, are convertible terms, Law of Water Courses, c. 6., s. 3, 4.

6. These distinctions in relation to several, free, and common of, fishery, are not strongly marked, and the lines are sometimes scarcely perceptible. "Instead of going into the black letter books, to learn what was a fishery, and a free fishery, and a several fishery," says Huston, J., "I am disposed to regard our own acts, even though differing, from old feudal times." 1 Whart. R. 132. See 14 Mus. R. 488; 2 Bl. Com. 39, 40; 7 Pick. R. 79. Vide, generally, Ang. Wat. Co.; Index, h. t; Woolr. on Wat. Index, h. t; Schul. Aq. R. Index, h. t; 2 Rill. Ab. ch. 18, p. 1,63; Dane's Ab. h. t; Bac. Ab. Prerogative, B 3; 12 John. R. 425; 14 John. R. 255 14 Wend. R. 42; 10 Mass., R. 212; 13 Mass. R. 477; 20 John. R. 98; 2 John. It. 170; 6 Cowen, R. 369; 1 Wend. R. 237; 3 Greenl. R. 269; 3 N. H. Rep. 321; 1 Pick. R. 180; 2 Conn. R. 481; 1 Halst. 1; 5 Harr. and Johns. 195; 4 Mass. R. 527; and the articles Arm of the sea; Creek; Navigable River; Tide.
-- Bouviers Law Dictionary
Legal Definition
A place prepared for catching fish with nets or hooks. This is commonly applied to the place of drawing a seine or net Hart v. Hill, 1 Whart. (Pa.) 131, 132. A right or liberty of taking fish ; a species of incorporeal hereditament, anciently termed "piscary," of which there are several kinds. 2 Bl. Comm. 34, 39; 3 Kent, Comm. 409-418; Arnold v. Mundy, 6 N. J. Law, 22, 10 Am. Dec. 356; Gould v. James, 6 Cow. (N. Y.) 376; Hart v. Hill, 1 Whart. (Pat) 124.
See also
-- Black's Law Dictionary
Legal Definition
The right to fish. See 6 N. J. L. 1, 10 Am. Dec. 356.
-- Ballentine's Law Dictionary