ISSN:
1365-2109
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract. River Frome pike, Esox lucius L., usually spawned in drainage channels connected to the main river. Most 0+ pike moved into the river during their first summer, but some remained in the channels until the following year. The latter group ate macro-invertebrates (chiefly Asellus), whereas their siblings in the main river were piscivorous. 0+ pike in the channels had slower growth rates than those in the river, but growth rates of the two groups in later years were similar. The presence of these initially slow-growing pike in the population caused problems in identifying the first annulus on the scales. The problem was identified by batch-marking 0+ fish in different years and examining scales from individuals that were subsequently recaptured. The interpretation of true annuli and false checks in older fish was aided by collecting sets of scales from individually tagged pike which were recaptured at intervals over a number of years. The study emphasized the importance of validating age determinations by obtaining information from more than one source.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2109.1990.tb00485.x
