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numbskull · 11-12-2009, 12:49 PM

Here is some info. The size of the fish doesn't matter. At this time of year fish hooked on artificials do very well. Warm water and deep hooking with bait and J hooks brings C&R mortality up to near 50%. Which means even in the worst scenario 1/2 of the fish you think will die, don't.

Mortality associated with catch-and-release angling of striped bass in the Hudson River
Titre du document / Document title
Mortality associated with catch-and-release angling of striped bass in the Hudson River
Auteur(s) / Author(s)
MILLARD Michael J. ; MOHLER Jerre W. ; KAHNLE Andrew ; COSMAN Amanda ;
Résumé / Abstract
Catch-and-release fishing commonly occurs in recreational fisheries, including those for the striped bass Morone saxatilis of the Atlantic coast. The contribution of catch-and-release practices to overall fishing mortality is often not estimated. We estimated the catch-and-release mortality for the Hudson River spawning stock of striped bass in 2001. Volunteer anglers caught striped bass between April 30 and May 16, 2001. Fish were transferred to transport boats in live wells and placed in one of nine 15.000-L land-based holding tanks. Control fish were collected by electrofishing and otherwise handled similarly. Treatment and control fish were uniquely tagged and held together for 5 d. Hooking mortality was estimated via conditional rate and additive rates. These two estimation techniques partitioned total observed mortality into hooking mortality and handling mortality, the latter being estimated from control fish. Catch-and-release mortality for striped bass averaged 16% for traditional J hooks and 5% for circle hooks over the entire period. Hook location and the occurrence of bleeding were the most influential variables in determining the probability of death. Mortality rate increased when water temperatures reached 16°C. This mortality rate is significant and should be considered when accounting for Hudson River striped bass removals from their spawning population.
Revue / Journal Title
North American journal of fisheries management ISSN 0275-5947 CODEN NAJMDP
Source / Source

Recreational Catch-and-Release Mortality Research in Maryland
Susquehanna Flats Catch-and-Release Fishery

Over a five week period in April and May 1998, three 2-day trials were conducted on the Flats. Participating anglers were instructed to use single hooked artificial lures. Fish were marked as deep or shallow hooked, transported and held for three days as in the other striped bass studies.
Two size groups of fish were sought for these experiments: less than 24 inches and greater than 24 inches. This size delineation was selected because mortality data for striped bass greater than 24 inches caught at low water temperatures in fresh water did not exist in the scientific literature.
The results showed that water temperature greatly influenced release mortality of striped bass caught on the Flats. Mortality was 0.15% at temperatures of 57-59°F, 4.2% at 61-62°F and 16.4% at 64-71°F. There was no difference in mortality between large (>24") and small (<24") striped bass at these low temperatures. More than 95% of the fish caught on the flats in this study were small males.

Catch and Release Fishing Mortality Study
Two factors predominate when considering the causes of angled fish mortality: the hooking location, and the degree of physiological stress suffered by the fish.

Hooking location - This factor demonstrates the largest source of variation in mortality observed in the studies and experiments reviewed. It is consistently shown that deep-hooking (hooking in the gills or gullet) causes relatively high mortality, up to 35% when accompanied by bleeding, whereas normal hooking (lips or jaw area) consistently causes minimal mortality, which is consistently less than 5% and often less than 1%. The Maryland Department of Natural Resources, in its Recreational Catch and Release Mortality research program concludes that the location of the hook wound is the single most important factor influencing catch and release mortality (4). If the hook wound affects a vital organ, mortality, is high. The location of the wound site has been demonstrated to be a function of hook size, type, the use of natural bait versus artificial lures and additional situational factors. Studies show that when fish are hooked in the lips or jaw area (shallow hooked), mortality is negligible, typically less than 1% (4,5). Conversely, mortality is at its highest when fish are hooked in the esophagus or gills (deep hooked) (5,11). Necropsies performed on gut hooked fish in a study by (5) Grover, et al, found that the majority had sustained major internal damage to the heart, stomach or liver. Grover demonstrates that hooking location effectively correlates to mortality rate.

Physiological Stress - Exercise performed by fish during a catch event, or caused by angler handling methods and air exposure all create measurable physiological responses. Physiological stress in fish has been measured by experimenters using cortisol, lactate and respiratory gas concentrations.

Although the catch and release mortality studies reviewed do not show statistical results directly correlating the degree of physiological stress to mortality, an experiment by Ferguson and Tufts examined the effects of artificially induced stress on rainbow trout. They concluded that various forms of physiological stress contribute to fish mortality (12). It is reasonable to infer that such stress also contributes to mortality in angled fish and therefore, that minimization of stress assists in reduction of catch and release mortality.

11-12-2009, 12:49 PM	#16
numbskull Oblivious // Grunt, Grunt Master iTrader: (0) Join Date: Nov 2005 Location: over the hill Posts: 6,682	Here is some info. The size of the fish doesn't matter. At this time of year fish hooked on artificials do very well. Warm water and deep hooking with bait and J hooks brings C&R mortality up to near 50%. Which means even in the worst scenario 1/2 of the fish you think will die, don't. Mortality associated with catch-and-release angling of striped bass in the Hudson River Titre du document / Document title Mortality associated with catch-and-release angling of striped bass in the Hudson River Auteur(s) / Author(s) MILLARD Michael J. ; MOHLER Jerre W. ; KAHNLE Andrew ; COSMAN Amanda ; Résumé / Abstract Catch-and-release fishing commonly occurs in recreational fisheries, including those for the striped bass Morone saxatilis of the Atlantic coast. The contribution of catch-and-release practices to overall fishing mortality is often not estimated. We estimated the catch-and-release mortality for the Hudson River spawning stock of striped bass in 2001. Volunteer anglers caught striped bass between April 30 and May 16, 2001. Fish were transferred to transport boats in live wells and placed in one of nine 15.000-L land-based holding tanks. Control fish were collected by electrofishing and otherwise handled similarly. Treatment and control fish were uniquely tagged and held together for 5 d. Hooking mortality was estimated via conditional rate and additive rates. These two estimation techniques partitioned total observed mortality into hooking mortality and handling mortality, the latter being estimated from control fish. Catch-and-release mortality for striped bass averaged 16% for traditional J hooks and 5% for circle hooks over the entire period. Hook location and the occurrence of bleeding were the most influential variables in determining the probability of death. Mortality rate increased when water temperatures reached 16°C. This mortality rate is significant and should be considered when accounting for Hudson River striped bass removals from their spawning population. Revue / Journal Title North American journal of fisheries management ISSN 0275-5947 CODEN NAJMDP Source / Source Recreational Catch-and-Release Mortality Research in Maryland Susquehanna Flats Catch-and-Release Fishery Over a five week period in April and May 1998, three 2-day trials were conducted on the Flats. Participating anglers were instructed to use single hooked artificial lures. Fish were marked as deep or shallow hooked, transported and held for three days as in the other striped bass studies. Two size groups of fish were sought for these experiments: less than 24 inches and greater than 24 inches. This size delineation was selected because mortality data for striped bass greater than 24 inches caught at low water temperatures in fresh water did not exist in the scientific literature. The results showed that water temperature greatly influenced release mortality of striped bass caught on the Flats. Mortality was 0.15% at temperatures of 57-59°F, 4.2% at 61-62°F and 16.4% at 64-71°F. There was no difference in mortality between large (>24") and small (<24") striped bass at these low temperatures. More than 95% of the fish caught on the flats in this study were small males. Catch and Release Fishing Mortality Study Two factors predominate when considering the causes of angled fish mortality: the hooking location, and the degree of physiological stress suffered by the fish. Hooking location - This factor demonstrates the largest source of variation in mortality observed in the studies and experiments reviewed. It is consistently shown that deep-hooking (hooking in the gills or gullet) causes relatively high mortality, up to 35% when accompanied by bleeding, whereas normal hooking (lips or jaw area) consistently causes minimal mortality, which is consistently less than 5% and often less than 1%. The Maryland Department of Natural Resources, in its Recreational Catch and Release Mortality research program concludes that the location of the hook wound is the single most important factor influencing catch and release mortality (4). If the hook wound affects a vital organ, mortality, is high. The location of the wound site has been demonstrated to be a function of hook size, type, the use of natural bait versus artificial lures and additional situational factors. Studies show that when fish are hooked in the lips or jaw area (shallow hooked), mortality is negligible, typically less than 1% (4,5). Conversely, mortality is at its highest when fish are hooked in the esophagus or gills (deep hooked) (5,11). Necropsies performed on gut hooked fish in a study by (5) Grover, et al, found that the majority had sustained major internal damage to the heart, stomach or liver. Grover demonstrates that hooking location effectively correlates to mortality rate. Physiological Stress - Exercise performed by fish during a catch event, or caused by angler handling methods and air exposure all create measurable physiological responses. Physiological stress in fish has been measured by experimenters using cortisol, lactate and respiratory gas concentrations. Although the catch and release mortality studies reviewed do not show statistical results directly correlating the degree of physiological stress to mortality, an experiment by Ferguson and Tufts examined the effects of artificially induced stress on rainbow trout. They concluded that various forms of physiological stress contribute to fish mortality (12). It is reasonable to infer that such stress also contributes to mortality in angled fish and therefore, that minimization of stress assists in reduction of catch and release mortality. Last edited by numbskull; 11-12-2009 at 12:55 PM..