Abstract To address population declines, many salmon populations are supplemented with hatchery-bred fish. Little is known about how growth performance of and wild compare during critical periods such as the first summer at sea. This study compares scale measurements between 1725 ranched 1976 from Burrishoole catchment (western Ireland) over 62 years (1956–2017). Post-smolt (PSG) was greater in...

The purpose of this study was to determine whether scale or otolith microstructures were more strongly related to fish growth. Scales and otoliths were sampled from 231 juvenile pink salmon (Oncorhynchus gorbuscha) collected from the marine waters of Southeast Alaska during two periods in 1993 and 1994. A computerized image analysis system was used to measure several periodic and non-periodic s...

Scales (n = 552) of chum salmon (Oncorhynchus keta) collected in the North Pacific Ocean in May 1998 and 1999 and April 1999 were used to compare time of annulus formation between years, regions, and ages. May samples were collected from approximately the same location and time, during two years of very different ocean conditions, 1998 a strong EI Nino year and 1999 a strong La Nina year. Sea s...

Hypogeococcus pungens Granara de Willink, sensu stricto, is a serious pest of cacti in Puerto Rico threating many Caribbean islands. A classical biological control program for H. pungens was initiated for Puerto Rico in 2010 with a survey for natural enemies of H. pungens in its native range of Argentina. Biological differences were observed between populations of H. pungens sampled on Amaranth...

We evaluated eye lenses as potential recorders of stable isotope histories in fish because they consist of metabolically inert optical proteins that are deposited in successive, concentric circles (laminae) much like otolith circuli and tree rings. We conducted four different tests on lenses from red snapper, red grouper, gag, and white grunt. The first test was a low-resolution screening of mu...

Garra rufa is one of the most popular therapeutic and commercially important fish in ichthyotherapy. Otolith and scale morphology provide new and useful information for fish identification and classification. Left-right asteriscus and lapillus otoliths from juvenile and adult doctor fish, and the scales from 6 different regions of the juvenile and adult fish body have been examined in Kangal Ba...

The Campanian of Alberta and Saskatchewan produce the oldest hiodontid fossils from North America, which are represented only by isolated centra. As such, very little is known about the taxonomic affinities, morphology, life history characteristics, and paleoecology of the taxon or taxa represented by the Cretaceous centra. To study the age and growth characteristics of Hiodontidae from the Cre...