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首页> 外文期刊>Marine ecology >Growth discontinuity in males of the deep-water giant red shrimp Aristaeomorpha foliacea in the Mediterranean Sea
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Growth discontinuity in males of the deep-water giant red shrimp Aristaeomorpha foliacea in the Mediterranean Sea

机译：地中海深水巨红虾Aristaeomorpha foliacea雄性的生长不连续性

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摘要

The deep-water giant red shrimp, Aristaeomorpha foliacea (Risso, 1827) (Decapoda, Aristeidae), represents a highly valuable resource for bottom trawling in the Mediterranean Sea. Recent assessments have described both a worsening of the status of the traditionally exploited stocks and low levels of annual-based instantaneous natural mortality (M 0.4-0.7 year~(-1)) in the unexploited stocks. The mortality (M) figures, however, are in contrast with the longevity (T_(max)) of 3-4-year males and 4-5-year females, estimated from classical length frequency distribution analysis. Reduced growth (after the onset of sexual maturity) and pile-up of older individuals in the larger size classes have been considered to be reasonable explanations for the contrast between M and T_(max). We propose that a discontinuity of the growth models could address this contrast. Because a clear discontinuity in sexual maturity is evident only in males, length frequency distribution data for different sets of males collected from the South of Sicily and the Maltese Islands deep bottoms (400-800 m) were fitted with both the classic (c) and double-phased (d) von Bertalanffy growth formula (VBGF). According to the dVBGF, adult males sharply reduce their growth rate after reaching an age between 1.2 and 1.5 year, which corresponds to the estimates of age at sexual maturity (t_m between 1 and 1.5 years). The reduction in growth determines a higher T_(max) (7.3-9.5 year) and lower M (0.4-0.6 year~(-1)) than previously derived on the basis of cVBGF estimates (T_(max) 3-4 years and M 1.2 year~(-1)). The dVBGF results suggest that sexual dimorphism and length-sex segregation in giant red shrimps reflect an alternative life history strategy that is based mainly on growth reduction in adult males and it might be adopted for implementing more conservative assessments.
机译：深水巨型红虾Aristaeomorpha foliacea（Risso，1827年）（Aristeidae的Decapoda）代表着在地中海进行拖网捕捞的极有价值的资源。最近的评估既描述了传统开发种群的状况恶化，又表明未开发种群的年度瞬时自然死亡率水平较低（M 0.4-0.7年〜（-1））。然而，死亡率（M）与通过经典长度频率分布分析估计的3-4岁男性和4-5岁女性的寿命（T_（max））相反。生长迟缓（性成熟后）和大龄人群中较大个体的堆积被认为是M和T_（max）之间对比的合理解释。我们建议增长模型的不连续性可以解决这种对比。由于仅在雄性身上才明显存在性成熟的不连续性，因此，从西西里岛南部和马耳他群岛深海底部（400-800 m）收集的不同雄性的长度频率分布数据都适用经典（c）和双相（d）冯·贝塔朗菲增长公式（VBGF）。根据dVBGF，成年男性在达到1.2至1.5岁之间时急剧降低了其生长速度，这与性成熟时的年龄估计值（t_m在1至1.5岁之间）相对应。增长的减少决定了c_BBGF估计值之前的T_（max）（7.3-9.5年）和更低的M（0.4-0.6年〜（-1））（T_（max）3-4年和M 1.2年〜（-1））。 dVBGF结果表明，巨型红虾中的性二态性和长度-性别隔离反映了一种主要基于成年雄性生长减少的替代生活史策略，可用于实施更保守的评估。

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  • 来源
    《Marine ecology》 |2012年第3期|p.386-392|共7页
  • 作者

    Sergio Ragonese; Sergio Vitale; Mark Dimech; Alberto De Santi;

  • 作者单位

    Institute for Marine and Coastal Environment, Italian National Research Council, IAMC-CNR, via L. Vaccara, 61, 91026, Mazara del Vallo (TP) Italy;

    Institute for Marine and Coastal Environment, Italian National Research Council, IAMC-CNR, via L. Vaccara, Mazara del Vallo (TP), Italy;

    Malta Centre for Fisheries Science (MCFS), Fort San Lucjan Marsaxlokk, BBG, Malta;

    Institute for Marine and Coastal Environment, Italian National Research Council, IAMC-CNR, via L. Vaccara, Mazara del Vallo (TP), Italy;

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  • 关键词

    aristaeomorpha foliacea; giant red shrimp; growth discontinuity; malta; mediterranean sea; sicily straits;

    机译：叶茶树巨型红虾;增长不连续性马耳他;地中海西西里海峡;

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