Daily ration and prey size of juvenile piscivore Japanese Spanish mackerel

Shoji, Jun; Tanaka, Masaru

doi:10.1111/j.0022-1112.2005.00813.x

Cited by 13 publications

(3 citation statements)

References 20 publications

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“…Shoji and Tanaka (2005) reported that Japanese Spanish mackerel juveniles of 30 mm in standard length (SL) are voracious feeders on high daily rations (66.1-82.6% body mass in dry weight) and mainly feed on larvae of Japanese anchovy Engraulis japonicus in the Seto Inland Sea. Based on the daily rations from a laboratory study, they estimated that the release of 100,000 Japanese Spanish mackerel juveniles of 30 mm SL potentially will lead to the consumption of 510,000-640,000 Japanese anchovy larvae during the first day of release.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Obata

Yamazaki

Iwamoto

et al. 2008

Reviews in Fisheries Science

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This study evaluated the stocking effectiveness of two release groups of Japanese Spanish mackerel, Scomberomorus niphonius, in the eastern Seto Inland Sea, Japan. Juveniles of about 40 mm in total length (TL) that were directly harvested from seed production tanks and 100 mm TL that were reared in nursery facilities were released from early June to early July. The otoliths of released juveniles were marked with alizarin complexone. In 2002, 51,000 40-mm and 82,929 100-mm juveniles and, in 2003, 94,000 40-mm and 77,193 100-mm juveniles were released. A total of 2,761 individuals were sampled at the 14 main fish landing markets between 2002 and 2004, from September in the release year to June the next year. Recapture rates, yields from the released juveniles, contribution rates to the commercial landings, and the economic efficiency were estimated with standard errors. The variance estimators were derived by assuming simple random sampling of the commercial landings. All estimates for evaluating stocking effectiveness showed significantly higher values in the 100-mm release group than in the 40-mm release group. Consequently, releasing 100-mm juveniles reared in nursery facilities was more efficient than direct release of 40 mm juveniles.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Obata

Yamazaki

Iwamoto

et al. 2008

Reviews in Fisheries Science

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“…The relationship between instantaneous gastric evacuation rate R and water temperature has been described by exponential and linear models, 30,31 and the R ‐value for winter flounder Pseudopleuronectes americanus , 31 bluefish Pomatomus saltatrix 32 and Japanese Spanish mackerel Scomberomorus niphonius 33 decreases as water temperature decreases. In the present study, assuming no feeding during night time, we estimated R at night when the water temperature was lower (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Daily rations and food availability of Japanese flounder Paralichthys�olivaceus, small flounder Tarphops�oligolepis and sand goby Favonigobius�gymnauchen at a sandy beach in the central Seto Inland Sea, Japan

Yamamoto

Tominaga

2007

Fisheries Sci

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To estimate the daily rations of Paralichthys olivaceus, Tarphops oligolepis and Favonigobius gymnauchen and to clarify diel variation in food availability to them, diel sampling was conducted over a 24-h period at a sandy beach in the Seto Inland Sea, Japan. The mean total length and body weight (BW) of P. olivaceus, T. oligolepis and F. gymnauchen were 32.6 mm (0.35 g), 23.7 mm (0.13 g) and 50.2 mm (1.03 g), respectively. The mean stomach contents index and percentages of stomachs with food were high during the day but low at night, indicating that these species are day-feeders. Paralichthys olivaceus and F. gymnauchen consumed mainly mysids and crangonids, whereas T. oligolepis fed chiefly on mysids. The estimated mean daily rations (95% confidence intervals) for P. olivaceus, T. oligolepis and F. gymnauchen made with the bootstrap method were 18.1 (9.3-31.3)%BW, 13.2 (7.9-24.3)%BW and 3.7 (1.7-7.4)%BW, respectively. Mysids were more abundant in the near-bottom layer during the day than at night, but the opposite was true for crangonids.

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“…The model below first assumes that a predator encounters a random member of the prey population at times following a non-homogeneous Poisson process. In many predator species, the prey size changes as the predator ages [44,45,46,47] and hence the availability of a particular parasite distributions also changes. The model, therefore, is further developed to clarify the effect of a change in prey age on the parasite distribution in the predator.…”

Section: Stochastic Model Of Parasite Acquisitionmentioning

confidence: 99%

What causes the increase in aggregation as a parasite moves up a food chain?

Lester,

McVinish

2016

Preprint

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General laws in ecological parasitology are scarce. Here we evaluate data published by over 100 authors to determine whether the number of hosts in a life cycle is associated with the degree of aggregation of fish parasites at different stages. Parasite species were grouped taxonomically to produce 20 or more data points per group as far as possible. Most parasites that remained at one trophic level were less aggregated than those that had passed up a food chain. We use a stochastic model to show that high parasite overdispersion in predators can be solely the result of the accumulation of parasites in their prey. The model is further developed to show that a change in the predators feeding behaviour with age may further increase parasite aggregation.

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Daily ration and prey size of juvenile piscivore Japanese Spanish mackerel

Cited by 13 publications

References 20 publications

Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Daily rations and food availability of Japanese flounder Paralichthys�olivaceus, small flounder Tarphops�oligolepis and sand goby Favonigobius�gymnauchen at a sandy beach in the central Seto Inland Sea, Japan

What causes the increase in aggregation as a parasite moves up a food chain?

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