title: Hematological indicators of stress in longline-captured sharks.
abstract: For many shark species, little information exists about the stress response to capture and release in commercial longline fisheries. Recent studies have used hematological profiling to assess the secondary stress response, but little is known about how, and to what degree, these indicators vary interspecifically. Moreover, there is little understanding of the extent to which the level of relative swimming activity (e.g., sluggish vs. active) or the general ecological classification (e.g., coastal vs. pelagic) correlates to the magnitude of the exercise-induced (capture-related) stress response. This study compared plasma electrolytes (Na(+), Cl(-), Mg(2+), Ca(2+), and K(+)), metabolites (glucose and lactate), blood hematocrit, and heat shock protein (Hsp70) levels between 11 species of longline-captured sharks (n=164). Statistical comparison of hematological parameters revealed species-specific differences in response to longline capture, as well as differences by ecological classification. Taken together, the blood properties of longline-captured sharks appear to be useful indicators of interspecific variation in the secondary stress response to capture, and may prove useful in the future for predicting survivorship of longline-captured sharks where new technologies (i.e., pop-up satellite tags) can verify post-release mortality.
authors.affiliation: University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02747, USA. hmarshall@umassd.edu
authors.forename: Heather
authors.initials: H
authors.lastname: Marshall
authors.forename: Lyndsay
authors.initials: L
authors.lastname: Field
authors.forename: Achankeng
authors.initials: A
authors.lastname: Afiadata
authors.forename: Chugey
authors.initials: C
authors.lastname: Sepulveda
authors.forename: Gregory
authors.initials: G
authors.lastname: Skomal
authors.forename: Diego
authors.initials: D
authors.lastname: Bernal
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D004573:Electrolytes / Q000097:blood; D050884:HSP72 Heat-Shock Proteins / Q000097:blood; D006400:Hematocrit / Q000662:veterinary; D019344:Lactic Acid / Q000097:blood; D010805:Physical Conditioning, Animal; D012149:Restraint, Physical; D012754:Sharks / Q000097:blood*; D013045:Species Specificity; D013312:Stress, Physiological; D013550:Swimming
chemical_list: D001786:Blood Glucose; D004573:Electrolytes; D050884:HSP72 Heat-Shock Proteins; D019344:Lactic Acid