Hydrophone identiflcation and charaderization of Cynoscion squamipinnis (Perciformes: Sciaenidae) spawning sites in the Gulf of Nicoya, Costa Rica

Baltz, Donald M.; Campos M., Jorge A.

dc.creator	Baltz, Donald M.
dc.creator	Campos M., Jorge A.
dc.date	2015-11-13
dc.date.accessioned	2016-05-03T15:29:54Z
dc.date.available	2016-05-03T15:29:54Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/21688
dc.identifier.uri	https://hdl.handle.net/10669/26732
dc.description	A hydrophone survey of the northem Gulf of Nicoya was conducted to identify spawning sites used by the corvina aguada (Cynoscíon squamapinnis). Between July 14, and July 17, 1992, thirty-one stations were surveyed during late aftemoon and evening hours. Large aggregations of drumming corvina were located as early as 1606 hrs, but were generally restricted to stations characterized by aboye average depth and moving water. Drumming activity by C. squamapinnis peaked between 1655 and 1910 hrs on four evenings and fully subsided by about 2\00 hrs. In a stepwise regression model, five variables were selected to predict sound intensity. The overall model was statistically significant (P < 0.0001) and explained a high proportion of the variance (R-square = 0.59). The five variables included in the model, in order of decreasing partial R-squares, were tide2 (0.2103), hour3 (0.1470), temperature2 (0.1051), substrate (0.0720), and salinity2 (0.0562). Local gillnet fishermen are familiar with corvina sound production behavior and sorne can identify the drumming species. Corvina fishing takes place only during periods known locally as "mareas de corvina" (Corvina tides), which are those that occur irnmediately after the highest (or lowest) tides of the month, and which gillnet fishermen claim to be the best for fishing. Thus, heaviest fishing concentrates in a period of eight to ten days a month, and we also suspect that fishing during "corvina tides" is focused on natural drumming aggregations. Under present management, the fishery may be reducing natural spawning success and maximizing effort by coinciding temporally with natural spawning aggregations.	en-US
dc.description	A hydrophone survey of the northem Gulf of Nicoya was conducted to identify spawning sites used by the corvina aguada (Cynoscíon squamapinnis). Between July 14, and July 17, 1992, thirty-one stations were surveyed during late aftemoon and evening hours. Large aggregations of drumming corvina were located as early as 1606 hrs, but were generally restricted to stations characterized by aboye average depth and moving water. Drumming activity by C. squamapinnis peaked between 1655 and 1910 hrs on four evenings and fully subsided by about 2\00 hrs. In a stepwise regression model, five variables were selected to predict sound intensity. The overall model was statistically significant (P < 0.0001) and explained a high proportion of the variance (R-square = 0.59). The five variables included in the model, in order of decreasing partial R-squares, were tide2 (0.2103), hour3 (0.1470), temperature2 (0.1051), substrate (0.0720), and salinity2 (0.0562). Local gillnet fishermen are familiar with corvina sound production behavior and sorne can identify the drumming species. Corvina fishing takes place only during periods known locally as "mareas de corvina" (Corvina tides), which are those that occur irnmediately after the highest (or lowest) tides of the month, and which gillnet fishermen claim to be the best for fishing. Thus, heaviest fishing concentrates in a period of eight to ten days a month, and we also suspect that fishing during "corvina tides" is focused on natural drumming aggregations. Under present management, the fishery may be reducing natural spawning success and maximizing effort by coinciding temporally with natural spawning aggregations.	es-ES
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2015 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 44 (2 B) August 1996; 743-751	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 44 (2 B) August 1996; 743-751	es-ES
dc.source	Revista Biología Tropical; Vol. 44 (2 B) August 1996; 743-751	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.subject	drumming aggregations	en-US
dc.subject	Golfo de Nicoya	en-US
dc.subject	habitat	en-US
dc.subject	sciaenidae	en-US
dc.subject	sound production	en-US
dc.title	Hydrophone identiflcation and charaderization of Cynoscion squamipinnis (Perciformes: Sciaenidae) spawning sites in the Gulf of Nicoya, Costa Rica	en-US
dc.type	artículo original

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