Habitat dependent predation‐competition interaction shifts of invasive smallmouth bass (Micropterus dolomieu) and resident cyprinids in the Chikuma River, Nagano Japan

Peterson, Miles I.; Kitano, Satoshi

doi:10.1007/s10641-021-01067-x

Cited by 2 publications

(2 citation statements)

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“…Stocking of smallmouth bass is illegal throughout Japan, and in many areas catch and release angling is also illegal. Despite these regulations, smallmouth bass continue to spread to new locations and there appear to be stable populations in many lakes and rivers (Peterson & Kitano, 2019; Peterson & Kitano, 2021a).…”

Section: Discussionmentioning

confidence: 99%

“…In Japan, smallmouth bass were first introduced in 1925 and spread throughout the country after a second illegal stocking in the 1990s, thought to be in Nagano Prefecture (Peterson & Kitano, 2021a; Yodo & Iguchi, 2003). They are currently found in numerous lakes as well as in many river systems, which have been colonized recently (Peterson et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Spawning season and nest guarding behavior of invasive smallmouth bass (Micropterus dolomieu) in a Japanese Lake

Peterson

Kitano

2022

Ecological Research

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Spawning of invasive smallmouth bass (Micropterus dolomieu) was studied in 2020 and 2021, in Lake Nojiri, Nagano, Japan. Male smallmouth bass began nest construction once water temperatures reached 14°C, and eggs progressed to fry dispersal in approximately 2 weeks. The main spawning season was in late May through early June, with a smaller second peak of nests in late June through early July. Nests were constructed primarily under dock cover, and nest size and depth were positively correlated with male body size. Of the nests that received eggs, nearly all progressed successfully to fry dispersal. Time lapse videos of male guarding behavior revealed that as nests progressed, males rotated less and were suspended off the bottom substrate. Similarly, the presence of egg predators was determined by experimental removal of guarding males. Freshwater gobies (Rhinogobius kurodai) were the only egg predators observed and arrived on all nests in the egg stage. However, only a handful of gobies visited each nest, the total number of eggs predated was low, and eggs or alevins in the progressed stage were rarely predated. These results indicate that in Lake Nojiri, smallmouth bass spawning is highly successful and egg predators appear to have minimal effect on egg survival. The stable smallmouth bass fishery without stocking at this lake is likely a product of these favorable spawning conditions. The lack of native egg predators may also be a driving factor in the continued spread of smallmouth bass throughout Japan.

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Section: Discussionmentioning

confidence: 99%