DISTRIBUTION AND RELATIVE ABUNDANCE OF FLYINGFISH (EXOCOETIDAE) IN THE EASTERN CARIBBEAN .2. SPAWNING SUBSTRATA, EGGS AND LARVAE
DISTRIBUTION AND RELATIVE ABUNDANCE OF FLYINGFISH (EXOCOETIDAE) IN THE EASTERN CARIBBEAN .2. SPAWNING SUBSTRATA, EGGS AND LARVAE
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DOI：
10.3354/meps117025
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发表时间：
1995-02-01
影响因子：
2.5
通讯作者：
MAHON, R
中科院分区：
文献类型：
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作者：
HUNTE, W;OXENFORD, HA;MAHON, R
1988年4月10日至5月6日，我们在东加勒比海67500平方海里（nmi（2））区域的40个站点调查了飞鱼产卵基质（漂浮物）、卵和幼虫的分布和相对丰度。仅48%的丝束中出现漂浮物，且数量< 1 g/nmi（-1）丝束。非浮力飞鱼卵特征的Hirunacothys affinis，Parexocoetus brachypterus和Cypselurus cyanopterus几乎没有。虽然收集的3014枚鱼卵中有21%是飞鱼卵，但其中除3枚外，其余均为Exocoetus spp的中上层卵。卵和漂浮物的稀少表明飞鱼通常可能在漂浮物上产卵，直到它淹没，和/或在淹没的基质上产卵。渔获率的所有鱼类幼虫和飞鱼幼虫显着高于白天拖比夜间拖，和平均幼虫大小较大的夜晚。这表明幼虫，特别是较小的幼虫，可能在夜间向下移动。这可能是一种光的反应，因为在满月时，短鳍原螯虾的幼虫比新月时更丰富。在整个调查区域，所有飞鱼的幼虫丰度变化很大，而E. volitans、短翅拟步行虫P. bracypterus和短翅拟步行虫C.蓝鳍金枪鱼E.在海洋站比沿海站更丰富。短鳍原螯虾的情况正好相反，表明这些物种的产卵地点不同。本文报道了该虫幼虫的地理分布。蓝鳍金枪鱼的分布与成虫的分布相吻合，在靠近南美大陆的调查区西南部，幼虫和成虫都很少见。拉尔丹的H.近亲结婚的人比较少这种稀有性和实际上没有卵，令人惊讶的是，这种物种在东加勒比海丰富，而且H。据了解，在调查期间，affinis正在产卵。H. affinis通常产卵和孵化需要进一步调查。
We investigated the distribution and relative abundance of flyingfish spawning substrata (flotsam), eggs and larvae by neuston tows at 40 stations across a 67 500 square nautical mile (nmi(2)) area of the eastern Caribbean from April 10 to May 6, 1988. Flotsam occurred in only 48% of the tows and in quantities < 1 g nmi(-1) tow. Non-buoyant flyingfish eggs characteristic of Hirundichthys affinis, Parexocoetus brachypterus and Cypselurus cyanopterus were virtually absent. Although 21% of the 3014 fish eggs collected were flyingfish eggs, all but 3 of these were pelagic eggs characteristic of Exocoetus spp. The rarity of eggs and flotsam suggests that flyingfish may typically spawn on floating material until it submerges, and/or spawn on submerged substrata. Catch rates of all fish larvae and of flyingfish larvae were significantly higher in day tows than night tows, and mean larval size was larger by night. This indicates that larvae, and particularly smaller larvae, may move downwards at night. This may be a Light response, since P. brachypterus larvae were more abundant at the surface around full moon than new moon. Larval abundance varied significantly across the survey area for all flyingfish, and separately for E. volitans, P. brachypterus and C. cyanopterus. Small larvae of E. volitans were more abundant at oceanic than coastal stations. The reverse was true for P. brachypterus, indicating different spawning locations for these species. The geographical distribution of larvae of C. cyanopterus coincided with the adult distribution, both larvae and adults being rare in the southwest sector of the survey area near the South American mainland. Larvae of H. affinis were relatively rare. This rarity, and the virtual absence of eggs, is surprising given the abundance of this species in the eastern Caribbean and the fact that H. affinis was known to be spawning during the time of the survey. The depth at which H. affinis typically spawns and hatches requires further investigation.