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1. Biometric relationships between body size and bone lengths in fish prey of the Eurasian otter Lutra lutra:

Creator:
Copp, Gordon H. and Kováč, Vladimír
Type:
article and TEXT
Subject:
dietary preferences, River Lee, cyprinids, and percids
Language:
English
Description:
e determined regression relat ionships between head bone lengths and body size (standard length and weight) in chub Leuciscus cephalus and Eurasian perch Perca fluviatilis, two species taken frequently by the otter in the River Lee catchment. All relationships yielded significant linear equations, whereas those for bone vs. body weight were logarithmic. Regression slopes for head bones do not differ greatly within species but do across species of the same family.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/

2. Fin condition in intensively cultured Eurasian perch (Perca fluviatilis)

Creator:
Stejskal, Vlastimil, Policar, Tomáš, Křišťan, Jiří, Kouřil, Jan, and Hamáčková, Jitka
Type:
article and TEXT
Subject:
intensive culture, percids, fin erosion, fin damage, and welfare
Language:
English
Description:
Condition of all fins was assessed in intensively cultured perch (n = 300) in comparison with control pond-reared perch (n = 30). Measurements of maximum fins length as well as a four point photographic scale were used. No damage to any fin was visually observed in the pond-reared group. The first dorsal fin showed the least damage in cultured perch with 93 % of fish demonstrating no erosion. The most affected were paired fins, with only 7 % and 2 % of pectoral and ventral fins, respectively, being non-eroded. No difference between culture systems was found in fin length for the first dorsal and the caudal fin. Pectoral, second dorsal, ventral, and anal fins of intensively cultured perch showed reductions up to 52, 49, 35, and 28 %, respectively. The relationship between fin lengths and standard body length (SL) were described for both groups (SL range 104-170 mm). Results of this study are discussed in relation to aesthetic, welfare and fish survival issues.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/