Hatcheries as Habitat, Integrated vs. Segregated Hatchery Programs, and Rehab for Hatchery Fish John Carlos Garza Southwest Fisheries Science Center &

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Presentation transcript:

Hatcheries as Habitat, Integrated vs. Segregated Hatchery Programs, and Rehab for Hatchery Fish John Carlos Garza Southwest Fisheries Science Center & University of California, Santa Cruz

In the beginning, there were the dams…. Then came the salmon hatcheries Nearly all hatcheries in California established to replace production of salmon and steelhead in natural areas above the dams. Hatcheries are a surrogate for spawning and rearing habitat.

Hatcheries in salmonid management Hatcheries are powerful tools to modify salmonid populations. Modifications can be of negative, positive or neutral with respect to population/ESU viability and evolution. The Devil is in the Details! Must use science-based approach informed by monitoring to direct operations and to evaluate where in the spectrum effects are occurring and mitigate appropriately. Considerations very different for large- and small-scale hatchery programs, and for different species.

Hatcheries in salmonid management Potential negative hatchery effects Ecological effects- Competition, direct predation, disease vectors. Domestication selection- Can be of many types, may ultimately result in loss of local adaptation and decreased fitness for both hatchery and natural fish reproducing in natural areas. Ryman/Laikre effect- Decrease in overall effective population size due to increased survival of hatchery fish. Most problematic when due to density dependence at juvenile or spawning stages. Inbreeding depression- Decrease in fitness, due to mating between related individuals.

Hatcheries in salmonid management Potential beneficial hatchery effects Refugia- Hold fish from remnant populations through high mortality life stages to ensure persistence. Many hatchery stocks also contain a significant portion of the remaining genetic legacy of the natural stock Reintroduction: Powerful mechanism to re-establish extirpated stocks Demographic effects- Population subsidies may reduce negative impacts of transient population declines, due to external effects Societal goals- Provide sufficient numbers of fish for desired fisheries and/or other goals Treaty obligations- Provide sufficient numbers of fish to meet tribal trust and other obligations.

Integrated vs. Segregated Hatchery Programs in California (Section 2.2, California HSRG Report) Previous HSRG reports used a dichotomous classification system for hatchery programs Integrated programs intend to minimize genetic divergence between the hatchery stock and the natural population with which it is expected to exchange spawners. Proportion of hatchery fish on natural spawning areas AND proportion of natural fish in hatchery broodstock both > 0. Segregated programs intend to minimize interbreeding between hatchery stock and natural population, maintaining high genetic divergence. Proportion of hatchery fish on natural spawning areas AND proportion of natural fish in hatchery broodstock both = 0.

Integrated vs. Segregated Hatchery Programs in California (Section 2.2, California HSRG Report) California HSRG members concurred that true Segregated hatchery programs, with no hatchery fish spawning in natural areas, are not feasible in California. There is a fundamental problem with Segregated programs in that the more genetically and phenotypically divergent the hatchery and natural stocks are, the more detrimental it is likely to be to the natural stock when hatchery fish (inevitably) spawn in natural areas. Therefore, the California HSRG concluded that all hatchery programs in California should be managed as Integrated, with the goal of minimizing the divergence between the hatchery stock and the natural population to which it contributes. Important to note that it is combinations of genes in hatchery fish, not the genes themselves, that may be detrimental. Rehabilitation.

Effects of hatchery fish on natural populations are mainly in vicinity of hatchery with natural homing patterns In Klamath basin, genetic and tag analyses show that salmon interbreeding drops off quickly with distance from hatchery. Onsite releases encourage homing back to hatchery. Substantial structure maintained, allowing local adaptation. In Central Valley, genetic and tag analyses show rampant interbreeding in all tributaries, regardless of distance to hatchery source. Offsite releases result in huge increase in straying. No structure, or local adaptation, remains in fall Chinook.

Effects of hatchery fish on natural populations are mainly in vicinity of hatchery with natural homing patterns In Klamath basin, genetic and tag analyses show that salmon interbreeding drops off quickly with distance from hatchery. Onsite releases encourage homing back to hatchery. Substantial structure maintained, allowing local adaptation. In Central Valley, genetic and tag analyses show rampant interbreeding in all tributaries, regardless of distance to hatchery source. Offsite releases result in huge increase in straying. No structure, or local adaptation, remains in fall Chinook. Offsite releases spread effects of hatchery fish on natural stocks and result in loss of local adaptation.

Effects of hatchery fish on natural populations are mainly in vicinity of hatchery with natural homing patterns Distribution of Chinook salmon redds in 2011 on the Trinity River from Lewiston Dam to Cedar Flat. Chamberlain et al. (2012) Arcata Fisheries Technical Report TR Nearly all hatchery fish redds in the Trinity River concentrated at dam.

Appropriate levels of interaction between hatchery and natural fish California HSRG did not believe that adequate information was available in most cases to recommend specific targets and thresholds for the proportion of hatchery spawners in the natural populations that they affect or for the proportion of natural spawners in hatchery broodstock. Robust Monitoring and Evaluation programs are needed to provide information to appropriately manage these programs and eventually set targets and thresholds for these interactions. Such programs are outlined in the CA HSRG Report Appendix IV.

Rehabilitation for hatchery fish (Get off the pellets, dude) A LARGE portion of the genetic legacy of native salmon and steelhead populations in California occurs in hatchery fish. We NEED to preserve it.

Rehabilitation for hatchery fish (Get off the pellets, dude) A LARGE portion of the genetic legacy of native salmon and steelhead populations in California occurs in hatchery fish. We NEED to preserve it. Hatchery fish do NOT have damaged genes. Lower fitness of hatchery fish is an average property and is due to changes in the frequency of gene combinations, not the genes themselves.

Rehabilitation for hatchery fish (Get off the pellets, dude) A LARGE portion of the genetic legacy of native salmon and steelhead populations in California occurs in hatchery fish. We NEED to preserve it. Hatchery fish do NOT have damaged genes. Lower fitness of hatchery fish is an average property and is due to changes in the frequency of gene combinations, not the genes themselves. Natural selection can and will change these frequencies back rapidly to optima for natural areas, rehabilitating them for natural populations.

Rehabilitation for hatchery fish (Get off the pellets, dude) A LARGE portion of the genetic legacy of native salmon and steelhead populations in California occurs in hatchery fish. We NEED to preserve it. Hatchery fish do NOT have damaged genes. Lower fitness of hatchery fish is an average property and is due to changes in the frequency of gene combinations, not the genes themselves. Natural selection can and will change these frequencies back rapidly to optima for natural areas, rehabilitating them for natural populations. Lower fitness then just in vicinity of hatcheries and possible benefits from higher diversity elsewhere.

Pro Hatchery? John Carlos Garza, an NMFS geneticist in Santa Cruz says “Historically, our best guess is that hatcheries have overall had a detrimental effect on salmon populations.” Science (2010) 327: