On the Capture of Rainbow Trout Parasalmo mykiss on the Kunashir Island

Kaev, A. M.; Romasenko, L. V.

doi:10.1134/s0032945221050076

Cited by 1 publication

(3 citation statements)

References 3 publications

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Section: Discussionmentioning

confidence: 94%

“…After the findings of Morita et al (2003), rainbow trout have subsequently been discovered in the Matsunori River on the Shiretoko Peninsula (Kentaro Morita, personal observation) and in Lake Onne on Kunashiri Island (Kaev & Romasenko, 2021). Kaev & Romasenko (2021) have suggested that the rainbow trout on Kunashiri Island might have strayed from rivers on the main island of Hokkaido. Individuals collected from the Matsunori River and Lake Onne have a silvery body color and easily detachable scales, indicating that they are in good condition for migration to the sea (Kaev & Romasenko, 2021;Kentaro Morita, personal observation).…”

Section: Discussionmentioning

confidence: 94%

“…Kaev & Romasenko (2021) have suggested that the rainbow trout on Kunashiri Island might have strayed from rivers on the main island of Hokkaido. Individuals collected from the Matsunori River and Lake Onne have a silvery body color and easily detachable scales, indicating that they are in good condition for migration to the sea (Kaev & Romasenko, 2021; Kentaro Morita, personal observation). Although expansion of the distribution of rainbow trout through private stocking has been a persistent problem in Hokkaido (Sahashi & Morita, 2016), the possibility of expansion of the distribution via the sea should also be taken into consideration.…”

Section: Discussionmentioning

confidence: 99%

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Rainbow trout in the inlet tributaries of Lake Chinishibetsu, Shiretoko Peninsula

Sahashi

Kuroki

Nobetsu

et al. 2023

Preprint

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Rainbow trout,Oncorhynchus mykiss, is one of the most widely introduced fish species in the world, and its impacts on native fishes and ecosystems are of considerable concern. One of the rivers inhabited by rainbow trout in the Shiretoko Peninsula is the Chinishibetsu River, and the origin of rainbow trout in this river is thought to be Lake Chinishibetsu in the upper reaches of the system, where the private stocking of rainbow trout was conducted in the 1960s. However, the basic biology of rainbow trout in the Lake Chinishibetsu area is currently unknown. This study addresses this knowledge gap by examining the biology of rainbow trout in the inlet tributaries of Lake Chinishibetsu based on sampling conducted during the rainbow trout spawning season. A total of 104 rainbow trout, ranging in age from 1+ to 8+ years, were collected from the two inlet tributaries of Lake Chinishibetsu. White-spotted charrSalvelinus leucomaenisand Siberian stone loachBarbatula oreas, neither of which is native to the Shiretoko Peninsula, were also collected and had presumably invaded the area at the same time as the rainbow trout. The sampled rainbow trout included immature and mature males and females. The distribution of fork lengths of mature females was bimodal, and the sex ratio of mature rainbow trout was male-biased. Our results indicate that the rainbow trout population in the inlet tributaries of Lake Chinishibetsu is reproducing continuously and exhibits a dimorphic life history with river residents and lake migrants of both sexes. Additionally, rainbow trout continue to be collected downstream of the Chinishibetsu River, which is the primary habitat for this species in the Shiretoko Peninsula. Therefore, unless rainbow trout are eliminated from Lake Chinishibetsu, which serves as a source of non-native species upstream of the Chinishibetsu River, it will be difficult to control rainbow trout distributions and minimize population sizes on the Shiretoko Peninsula.

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Section: Discussionmentioning

confidence: 94%