Spatial and Temporal Variability of Spawning in the Green Sea Urchin<i>Strongylocentrotus droebachiensis</i>along the Coast of Maine

Vadas, Robert L.; Beal, Brian F.; Dudgeon, Steve; Wright, Wesley A.

doi:10.2983/035.034.0337

Cited by 9 publications

(2 citation statements)

References 203 publications

(210 reference statements)

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“…Variation in temperature, especially seawater temperature is one of the cues that influence spawning (Garrido & Barber, 2001; James & Siikavuopio, 2018; Vadas, Beal, Dudgeon, & Wright, 2015). Variations in temperature occurred in the current study due to the tanks being situated outside and exposed to natural environmental conditions and fluctuations in incoming seawater temperatures.…”

Section: Discussionmentioning

confidence: 99%

The effect of fresh seaweed and a formulated diet supplemented with seaweed on the growth and gonad quality of the collector sea urchin, Tripneustes gratilla , under farm conditions

et al. 2020

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This gonad enhancement study investigates the effect of different fresh and formulated feeds and feeding regimes on the growth and gonad quality of wild‐collected adult sea urchin, Tripneustes gratilla, under farm conditions for over 18 weeks. In the first 12 weeks (phase 1), urchins were fed fresh Ulva rigida (U); a 50:50 mixture of fresh U. rigida and Gracilaria gracilis (UG); fresh G. gracilis (G) and a formulated diet 20U (containing 20% U. rigida), and in the final 6 weeks (phase 2) of the study, diet was changed to a formulated feed (20U diet). By the end of phase 1, urchins fed the 20U diet produced gonads (50.72 ± 5.4 g) that were significantly heavier (p < .001) than the gonads of urchins fed the fresh seaweed diets (U, UG & G). By the end of phase 2, gonad weight of urchins in treatment groups UG‐20U and G‐20U were similar to those fed the 20U‐20U diet. Gonad colour of urchins in the G‐20U treatment became significantly lighter (ANOVA, p = .029) and poorer quality, compared with urchins in the U‐20U group. This gonad enhancement study, conducted on wild‐collected adult T. gratilla, has shown that a formulated feed (20U diet) can enhance gonad growth and produce commercially acceptable gonads. This farm‐based study supports previous findings from aquarium‐based studies by our group and indicates that short‐term sea urchin gonad enhancement can be carried out under farm conditions in South Africa.

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Section: Discussionmentioning

confidence: 99%

The effect of fresh seaweed and a formulated diet supplemented with seaweed on the growth and gonad quality of the collector sea urchin, Tripneustes gratilla , under farm conditions

et al. 2020

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“…As with other urchin species, if food is limiting to larval success, we would also expect spawning to coincide with phytoplankton blooms (the primary resource for the larval stages of sea urchin), rather than temperature [ 46 , 58 – 60 ]. Sea urchin larvae begin to feed within the first week of life and remain in the water column for about 40 days (ranging from 27 to 131 days depending on food and temperature; [ 61 , 62 ]).…”

Section: Discussionmentioning

confidence: 99%

Quality of a fished resource: Assessing spatial and temporal dynamics

Teck¹,

Lorda²,

Shears³

et al. 2018

PLoS ONE

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Understanding spatio-temporal variability in the demography of harvested species is essential to improve sustainability, especially if there is large geographic variation in demography. Reproductive patterns commonly vary spatially, which is particularly important for management of “roe”-based fisheries, since profits depend on both the number and reproductive condition of individuals. The red sea urchin, Mesocentrotus franciscanus, is harvested in California for its roe (gonad), which is sold to domestic and international sushi markets. The primary driver of price within this multi-million-dollar industry is gonad quality. A relatively simple measure of the fraction of the body mass that is gonad, the gonadosomatic index (GSI), provides important insight into the ecological and environmental factors associated with variability in reproductive quality, and hence value within the industry. We identified the seasonality of the reproductive cycle and determined whether it varied within a heavily fished region. We found that fishermen were predictable both temporally and spatially in collecting urchins according to the reproductive dynamics of urchins. We demonstrated the use of red sea urchin GSI as a simple, quantitative tool to predict quality, effort, landings, price, and value of the fishery. We found that current management is not effectively realizing some objectives for the southern California fishery, since the reproductive cycle does not match the cycle in northern California, where these management guidelines were originally shaped. Although regulations may not be meeting initial management goals, the scheme may in fact provide conservation benefits by curtailing effort during part of the high-quality fishing season right before spawning.

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Distribution patterns and biological aspects of Strongylocentrotus droebachiensis (Echinoidea: Echinoida) in Russian waters of the Barents Sea: implications for commercial exploration

Dvoretsky,

Dvoretsky

2024

Rev Fish Biol Fisheries

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Spatial and Temporal Variability of Spawning in the Green Sea UrchinStrongylocentrotus droebachiensisalong the Coast of Maine

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 9 publications

References 203 publications

The effect of fresh seaweed and a formulated diet supplemented with seaweed on the growth and gonad quality of the collector sea urchin, Tripneustes gratilla , under farm conditions

The effect of fresh seaweed and a formulated diet supplemented with seaweed on the growth and gonad quality of the collector sea urchin, Tripneustes gratilla , under farm conditions

Quality of a fished resource: Assessing spatial and temporal dynamics

Distribution patterns and biological aspects of Strongylocentrotus droebachiensis (Echinoidea: Echinoida) in Russian waters of the Barents Sea: implications for commercial exploration

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