TY - JOUR
T1 - Using a multi-parameter approach to reassess maturity of spiny dogfish, squalus acanthias, following increased fishing pressure in the western north atlantic
AU - Bubley, Walter J.
AU - Sulikowski, James A.
AU - Koester, David M.
AU - Tsang, Paul C.W.
N1 - Funding Information:
We thank the captains and crew for collection of S. acanthias conducted on the F/V “Mystique Lady”, F/V “Lady Victoria”, and on the National Oceanic and Atmospheric Administration/National Marine Fisheries Service bottom trawl surveys. We thank E. Nuber, T. Boag, and L. Carleton for histological processing. This study was made possible by a grant to PCWT and JAS from the National Sea Grant College Program of the U.S. Department of Commerce's National Oceanic and Atmospheric Administration grant NA060AR4170109 to the N.H. Sea Grant College Program.
PY - 2013/10
Y1 - 2013/10
N2 - Age at size was linked to sexual maturity in 147 male and 249 female spiny dogfish, Squalus acanthias, from the Gulf of Maine using three criteria: (1) gross reproductive morphology, (2) histology and (3) steroid hormone concentrations. Collected specimens ranged from 25. cm to 102. cm stretch total length, and 0 to 24 years old. Maturity ogives for males, based on data gathered for clasper length, circulating testosterone concentrations and proportion of tissue with mature spermatocysts within the testes, predicted that 50% maturity occurred at a total length of 63.1. mm and 7.5 years of age. For females, maturity ogives, based on data gathered for embryo presence, ovary mass, shell gland mass, follicle size and circulating estradiol concentrations, predicted that 50% maturity occurred at a total length of 76.9. cm and 9.1 years of age. These maturity parameters for females decreased by over 7. cm and 3 years from those previously reported two decades ago for S. acanthias in the Western North Atlantic. While the causes for the decrease in maturity parameters could not be determined, as this was beyond the scope of the current study, these changes occurred over a period of increased fishing pressure.
AB - Age at size was linked to sexual maturity in 147 male and 249 female spiny dogfish, Squalus acanthias, from the Gulf of Maine using three criteria: (1) gross reproductive morphology, (2) histology and (3) steroid hormone concentrations. Collected specimens ranged from 25. cm to 102. cm stretch total length, and 0 to 24 years old. Maturity ogives for males, based on data gathered for clasper length, circulating testosterone concentrations and proportion of tissue with mature spermatocysts within the testes, predicted that 50% maturity occurred at a total length of 63.1. mm and 7.5 years of age. For females, maturity ogives, based on data gathered for embryo presence, ovary mass, shell gland mass, follicle size and circulating estradiol concentrations, predicted that 50% maturity occurred at a total length of 76.9. cm and 9.1 years of age. These maturity parameters for females decreased by over 7. cm and 3 years from those previously reported two decades ago for S. acanthias in the Western North Atlantic. While the causes for the decrease in maturity parameters could not be determined, as this was beyond the scope of the current study, these changes occurred over a period of increased fishing pressure.
KW - Histology
KW - Morphology
KW - Physiology
KW - Reproduction
KW - Steroid hormones
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U2 - 10.1016/j.fishres.2013.06.004
DO - 10.1016/j.fishres.2013.06.004
M3 - Article
AN - SCOPUS:84880847238
SN - 0165-7836
VL - 147
SP - 202
EP - 212
JO - Fisheries Research
JF - Fisheries Research
ER -