Captive Rearing Program for Salmon River Chinook Salmon, 2000 Project Progress Report.

Venditti, David A.

doi:10.2172/910568

2002

DOI: 10.2172/910568

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Captive Rearing Program for Salmon River Chinook Salmon, 2000 Project Progress Report.

David A. Venditti¹

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Cited by 2 publications

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“…Exposure conditions are most important in early life due to rapid development and high selection. Fittingly, instream incubation of eggs is a widespread practice used for salmonid populations (Egglishaw et al 1984;Pauwels and Haines 1994;Donaghy and Verspoor 2000;Venditti et al 2000).…”

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Performance of Instream Jordan–Scotty Salmon Egg Incubators Under Different Installation and Sedimentation Conditions

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Palm-Flawd

Charron

2018

N American J Fish Manag

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Fish stocking, in which natural populations are supplemented with progeny through some unnatural means, is widespread and takes many forms. Long‐term benefits of population viability are generally greatest when individuals are subjected to as little artificial rearing as possible. For salmonids, instream incubation enables embryo exposure to natural conditions during a critical developmental period. The Jordan–Scotty incubator is a new tool that facilitates the ability to conduct instream incubation on a semi‐large scale. However, the performance of this type of incubator is affected by sedimentation. We quantified sediment accumulation within Jordan–Scotty incubators when installed using four potential methods in a blocked design that eliminated confounding space–time variables. Although sediment accumulation was highly variable, there appeared to be no benefit in taking the extra effort to install the incubators under gravel as recommended by the manufacturer. Incubator exposure to streamflow can be achieved in several ways and reduces sedimentation. We recommend the use of pre‐installed plastic milk crates as incubator receptacles.

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mentioning

confidence: 99%

Performance of Instream Jordan–Scotty Salmon Egg Incubators Under Different Installation and Sedimentation Conditions

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Palm-Flawd

Charron

2018

N American J Fish Manag

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Reproductive Behavior and Success of Captive‐Reared Chinook Salmon Spawning under Natural Conditions

Venditti

James

Kline

2013

N American J Fish Manag

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In response to declining returns of Pacific salmon Oncorhynchus spp., captive‐rearing programs have emerged as one approach to maintain natural‐origin stocks while mechanisms responsible for their decline are addressed. However, it remains unclear if observed differences in reproductive behavior between captive‐origin (captive) and natural‐origin (natural) Chinook Salmon O. tshawytscha in laboratory experiments accurately predict reproductive success of captive salmon in the natural environment. Over a 4‐year period, 859 natural Chinook Salmon juveniles were collected for full‐term rearing in captivity. From these, we returned 247 maturing adults to their natal stream over 2 years, assessed trends in habitat use, monitored their courtship and spawning behaviors, and sampled their redds to determine if fertilized eggs were present. Habitat use followed a logical trend toward spawning areas as the season progressed. Captive fish were smaller and spawned later than did natural fish, but their size did not prevent females from constructing redds or prevent males from courting and fertilizing eggs. Captive fish were observed participating in 16 spawning events over two seasons. Captive and natural males displayed the same courtship behaviors, but natural males were more aggressive. Captive females selected redd sites similar to those of natural females and displayed digging behavior consistent with published observations. Eggs were collected from 22 of the 26 redds sampled, and survival to organogenesis was 68.3% in 2001 and 34.6% in 2002. The decline in 2002 was at least partially due to an apparent failure of females from brood year 1997 to produce viable eggs. We estimated captive fish contributed 19,000 eyed eggs to the population. If the 859 juveniles reared in captivity had been left in the stream, fewer than one adult would be expected to have returned. Growth, timing of spawning, and egg survival issues remain in captive fish, which illustrates a need to focus future research on improved culture techniques.Received July 21, 2011; accepted October 26, 2012

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Captive Rearing Program for Salmon River Chinook Salmon, 2000 Project Progress Report.

Cited by 2 publications

References 10 publications

Performance of Instream Jordan–Scotty Salmon Egg Incubators Under Different Installation and Sedimentation Conditions

Performance of Instream Jordan–Scotty Salmon Egg Incubators Under Different Installation and Sedimentation Conditions

Reproductive Behavior and Success of Captive‐Reared Chinook Salmon Spawning under Natural Conditions

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