Instream Rights and Hatchery Fish

Coho (Oncorhynchus kisutch) and chinook salmon (0. tshawytscha) from aquaculture and wild environments were subjected to handling (30–60 s of netting and aerial emersion) and disease challenges. Plasma cortisol concentrations ([cortisol]pl) in both coho and chinook salmon from wild environments were significantly elevated 4 h after handling. Colonized coho salmon (hatchery-reared fish, transported into a natural water body as fry) responded in a similar fashion to wild fish, while those reared entirely in the hatchery showed no significant rise in [cortisol]pl. The responses to handling stress were retained in wild and colonized coho salmon after 7 mo of hatchery rearing. A transient increase in the leukocyte to red blood cell ratio in both wild and hatchery-reared chinook salmon occurred 4 h after handling. Handling signficantly decreased the antibody-producing cell (APC) number in wild fish and elevated their [cortisol]plrelative to hatchery fish. Wild fish had the highest APC number among the three groups before the handling. No difference in resistance to Vibrio anguillarum was apparent in coho and chinook salmon among the different rearing environments, although chinook salmon were generally more susceptible; disease resistance was reduced in wild coho salmon after 7 mo of rearing in a hatchery.

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Migration barriers protect indigenous brown trout (Salmo trutta) populations from introgression with stocked hatchery fish

Conservation Genetics ◽

10.1007/s10592-004-7822-x ◽

2005 ◽

Vol 6 (2) ◽

pp. 175-191 ◽

Cited By ~ 37

Author(s):

J. K. J Van. Houdt ◽

J. Pinceel ◽

M. -C. Flamand ◽

M. Briquet ◽

E. Dupont ◽

...

Keyword(s):

Brown Trout ◽

Salmo Trutta ◽

Hatchery Fish ◽

Migration Barriers ◽

Brown Trout Salmo Trutta

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ANALISIS FINANSIAL USAHA PEMBENIHAN IKAN LELE SANGKURIANG (Clarias gariepinus) DI DESA TATELI DUA KECAMATAN MANDOLANG KABUPATEN MINAHASA PROVINSI SULAWESI UTARA

AKULTURASI (Jurnal Ilmiah Agrobisnis Perikanan) ◽

10.35800/akulturasi.4.7.2016.13953 ◽

2016 ◽

Vol 4 (7) ◽

Author(s):

Maria Binei ◽

Victoria E.N. Manoppo ◽

Djuwita R.R. Aling

Keyword(s):

Return On Investment ◽

Financial Analysis ◽

Clarias Gariepinus ◽

Profit Rate ◽

Hatchery Fish ◽

Operating Profit ◽

North Sulawesi ◽

One Year ◽

Break Even Point ◽

The Village

Abstrak Penelitian ini bertujuan untukmengetahui kelayakan usaha pembenihan ikan lele sangkuriang (Clarias gariepinus) di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa Provinsi Sulawesi Utara dari aspek finansialnya dan Untuk mendeskripsikan faktor-faktor apa saja yang turut mempengaruhi dalam usaha pembenihan ikan lele sangkuriang (Clarias gariepinus) di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa Provinsi Sulawesi Utara. Berdasarkan hasil analisis secara finansial, usaha pembenihan ikan lele sangkuriang di Desa Tateli Dua tersebut sangat layak dijalankan karena semua nilai Operating Profit positif , Profit Rate dari usaha tersebut mencapai 31%, nilai BCR > 1, usaha tersebut termasuk kategori sangat baik karena mempunyai nilai rentabilitas >100%, BEP atau titik impas tidak sama yaitu BEP penjualan Rp. 8.607.285, BEP satuan 8.197 ekor. tingkat pengembalian investasi dari usaha pembenihan ikan lele sangkuriang tersebut sangat layak dijalankan karena dapat mengembalikan investasi kurang dari 1 tahun, yaitu 0,5 tahun. Kata Kunci : Analisis Finansial, Usaha, Pembenihan Ikan Lele Sangkuriang, Kecamatan Mandolang Abstrack This study aims to determine the feasibility of hatchery fish catfish (Clarias gariepinus) in the village of Tateli Two sub district Mandolang Minahasa North Sulawesi province of aspects of financial and To describe what factors are also influencing the business hatchery fish catfish (Clarias gariepinus) Village Tateli Two subdistrict Mandolang Minahasa North Sulawesi Province. Based on the analysis in the financial, business hatchery fish catfish in the village Tateli Two is very viable for all grades Operating Profit positive, Profit Rate of the effort reaches 31%, the value of BCR> 1, these efforts included the very good category because it has the value of earnings > 100%, BEP or break-even point at which the sale of BEP Rp. 8,607,285, 8,197 units BEP tail. the return on investment of catfish fish hatchery operations is very viable because it can recover the investment of less than one year, which is 0.5 years. Keywords: Financial Analysis, Business, Catfish Hatchery Sangkuriang, District Mandolang

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Fishery collapse, recovery, and the cryptic decline of wild salmon on a major California river

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2017-0273 ◽

2018 ◽

Vol 75 (11) ◽

pp. 1836-1848 ◽

Cited By ~ 5

Author(s):

Malte Willmes ◽

James A. Hobbs ◽

Anna M. Sturrock ◽

Zachary Bess ◽

Levi S. Lewis ◽

...

Keyword(s):

Oncorhynchus Tshawytscha ◽

Temporal Trends ◽

River System ◽

Wild Salmon ◽

Hatchery Fish ◽

Relative Contribution ◽

Feather River ◽

The Status ◽

Fishery Collapse ◽

Salmon Fishery

Fall-run Chinook salmon (Oncorhynchus tshawytscha) from the Sacramento–San Joaquin River system form the backbone of California’s salmon fishery and are heavily subsidized through hatchery production. Identifying temporal trends in the relative contribution of hatchery- versus wild-spawned salmon is vital for assessing the status and resiliency of wild salmon populations. Here, we reconstructed the proportion of hatchery fish on natural spawning grounds in the Feather River, a major tributary to the Sacramento River, using strontium isotope (87Sr/86Sr) ratios of otoliths collected during carcass surveys from 2002 to 2010. Our results show that prior to the 2007–2008 salmon stock collapse, 55%–67% of in-river spawners were of hatchery origin; however, hatchery contributions increased drastically (89%) in 2010 following the collapse. Data from a recent hatchery marking program corroborate our results, showing that hatchery fish continued to dominate (∼90%) in 2011–2012. Though the rebound in abundance of salmon in the Feather River suggests recovery of the stock postcollapse, our otolith chemistry data document a persistent decline of wild spawners, likely leading to the erosion of locally adapted Feather River salmon populations.

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Growth and Survival of Hatchery-Produced Atlantic Sturgeon Released as Young-of-Year into the Hudson River, New York

Journal of Fish and Wildlife Management ◽

10.3996/012011-jfwm-005 ◽

2012 ◽

Vol 3 (1) ◽

pp. 23-32 ◽

Cited By ~ 4

Author(s):

Jerre W. Mohler ◽

John A. Sweka ◽

Andrew Kahnle ◽

Kathryn Hattala ◽

Amanda Higgs ◽

...

Keyword(s):

New York ◽

Atlantic Coast ◽

Hudson River ◽

Atlantic Sturgeon ◽

Growth And Survival ◽

New York Bight ◽

Hatchery Fish ◽

Pectoral Spine ◽

Acipenser Oxyrinchus ◽

Pelvic Fin

Abstract In 2007, a team of U.S. scientists performed a status review of Atlantic sturgeon Acipenser oxyrinchus oxyrinchus and concluded that the species would likely become endangered (U.S. Endangered Species Act 1973, as amended) in the foreseeable future over much of its range, including populations of the New York Bight, which is comprised of the Hudson and Delaware rivers. Therefore, we evaluated an experimental release of hatchery-produced Atlantic sturgeon that took place in 1994 to determine the value of using stocked fish as a population recovery tool. We obtained recapture data on hatchery fish (identified by presence of pelvic fin removal) from the Atlantic Coast Sturgeon Tagging Database. Our evaluation of retention for a pelvic fin removal mark on hatchery fish showed that 36% of clipped individuals retained a clean fin clip after 49 d. The minimum survival rate for hatchery fish to age 5 was estimated to be in the range of 0.49–0.66% using documented recaptures (N = 24), known number of fish stocked, and results of the pelvic fin removal evaluation. Length and weight-at-age for recaptured hatchery fish at known ages 5–17 were within the range of values reported for wild fish whose ages were estimated by pectoral spine analysis. We also report that one ripe male hatchery fish at age 15 was captured along with other spermiating males at its parental spawning area in the Hudson River in 2009.

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