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Dissecting mortality components for ...

Kerns, Janice Annette.

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Dissecting mortality components for recreational fisheries with high rates of released fish.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dissecting mortality components for recreational fisheries with high rates of released fish./
作者:	Kerns, Janice Annette.
面頁冊數:	91 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
Contained By:	Dissertation Abstracts International75-09B(E).
標題:	Aquatic sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3584471
ISBN:	9781321048681

Dissecting mortality components for recreational fisheries with high rates of released fish.
Kerns, Janice Annette.

Dissecting mortality components for recreational fisheries with high rates of released fish. - 91 p.

Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.

Thesis (Ph.D.)--University of Florida, 2013.

This item must not be sold to any third party vendors.

The purpose of this study was to assess the components of mortality for Florida Bass Micropterus floridanus with high rates of angler release and to evaluate the potential impact of all sources of mortality on bass populations. My first objective was to estimate the total fishing mortality through direct estimates of harvest fishing mortality and indirect estimates of mortality associated with catch-and-release fishing across a large number of lakes. My second objective was to directly estimate all components of total mortality for a single lake: (a) natural mortality, and (b) fishing mortality due to harvest, catch-and-release and tournament components. My third objective was to investigate how seasonal trends in fishing and natural mortality influence mortality estimates derived from annual tag-return data. I used a passive tag reward study spread over one management regulation area within central Florida and then utilized a combined telemetry-tag return study on Lake Santa Fe, a fishery within north central Florida. All fish were tagged with either a $5, $100, or $200 total reward amount. The last objective was met by simulating a number of mortality scenarios using both theoretical and field-based seasonal estimates. Results of this study indicated that overall average fishing mortality for Florida bass in central Florida is relatively low, but much higher fishing mortality at Lake Santa Fe. Additionally, this study found simulated seasonal fluctuations in mortality could bias fishing mortality estimates derived from annual tag-return information. This was especially true for scenarios that simulated relatively high natural mortality rates. Thus, there is a need to evaluate fishing mortality at multiple spatial and temporal scales. For some fisheries this may be easy, as mortality rates remain relatively constant over time, but others may be more difficult. Thus, I suggest a two-tiered approach with 1) periodic (e.g., 5-10 year intervals) estimation of regional fishing mortality across lakes, and 2) site-specific estimates of mortality components when fishing mortality is suspected to be high, or when evaluating management regulations.

ISBN: 9781321048681Subjects--Topical Terms:

3174300
Aquatic sciences.

Dissecting mortality components for recreational fisheries with high rates of released fish.
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520 $a The purpose of this study was to assess the components of mortality for Florida Bass Micropterus floridanus with high rates of angler release and to evaluate the potential impact of all sources of mortality on bass populations. My first objective was to estimate the total fishing mortality through direct estimates of harvest fishing mortality and indirect estimates of mortality associated with catch-and-release fishing across a large number of lakes. My second objective was to directly estimate all components of total mortality for a single lake: (a) natural mortality, and (b) fishing mortality due to harvest, catch-and-release and tournament components. My third objective was to investigate how seasonal trends in fishing and natural mortality influence mortality estimates derived from annual tag-return data. I used a passive tag reward study spread over one management regulation area within central Florida and then utilized a combined telemetry-tag return study on Lake Santa Fe, a fishery within north central Florida. All fish were tagged with either a $5, $100, or $200 total reward amount. The last objective was met by simulating a number of mortality scenarios using both theoretical and field-based seasonal estimates. Results of this study indicated that overall average fishing mortality for Florida bass in central Florida is relatively low, but much higher fishing mortality at Lake Santa Fe. Additionally, this study found simulated seasonal fluctuations in mortality could bias fishing mortality estimates derived from annual tag-return information. This was especially true for scenarios that simulated relatively high natural mortality rates. Thus, there is a need to evaluate fishing mortality at multiple spatial and temporal scales. For some fisheries this may be easy, as mortality rates remain relatively constant over time, but others may be more difficult. Thus, I suggest a two-tiered approach with 1) periodic (e.g., 5-10 year intervals) estimation of regional fishing mortality across lakes, and 2) site-specific estimates of mortality components when fishing mortality is suspected to be high, or when evaluating management regulations.
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