细虹银汉鱼 · Slender Rainbowfish
概要
| 字段 | 值 |
|---|---|
| 类别 | 鱼 |
| 学名 | Melanotaenia gracilis |
| 别名 | 細虹銀漢魚 |
| 分类 | 银汉鱼目 Atheriniformes › 黑带银汉鱼科 Melanotaeniidae › Melanotaenia |
| 水体 | 淡水 |
| 成体体长 | 7.5 cm |
| 饲养难度 | 中等 |
| 最小水体 | 68 L |
| 最小缸长 | 75 cm |
| 群居方式 | 群游 |
| 外部数据 | seriouslyfish melanotaenia-gracilis;fishbase 10493 |
| 原产地 | 澳大利亚西北部金伯利地区的德赖斯代尔河与卡森河 |
| 性情 | 温和 |
水质参数
| 参数 | 耐受范围 | 最适范围 | 单位 |
|---|---|---|---|
| 水温 | 22–28 | — | °C |
| pH | 7–8 | — | — |
| 总硬度 | 10–20 | — | dGH |
概述
细虹银汉鱼（Melanotaenia gracilis）体形较小、轮廓修长，性情温和而容易受惊。群养和低水流比复杂布景更重要，至少六至八条一起生活较合适。
分布与栖息地
已知分布在澳大利亚西北部金伯利地区的德赖斯代尔河与卡森河，常见于清澈而缓流的河段。旱季也会留在周边与主河道隔开的水潭中，环境通常植被稀少、石块较多。
饲养环境
底面积至少约 75 × 30 cm，可用砾石底床、圆滑卵石和少量树枝营造稀疏的河床景观，也可采用密植水草的布置。两种布局都应保持很弱的水流，提供符合其偏硬、近中性至碱性需求的水。
食性与喂食
多数干饲料、冷冻饵和活饵都能接受，规律加入适口活饵有助于发色。
习性与混养
属于温和的小型彩虹鱼，可与水质需求相近、体形相仿的温和鱼混养。不要仅因另一种鱼也喜欢硬水就认定一定相容，仍需考虑体形和性情。
至少六至八条成群，空间允许时可增加数量。同种伙伴能减轻紧张，也有利于雄鱼展示颜色。
雌雄区分
成年雄鱼较大、颜色更鲜明，随着成熟体高也比雌鱼更明显。
繁殖
可能采用与同属相近的散卵方式，但尚不能把具体过程视为确定的繁殖方案。自然环境缺少水草，因此也有卵可能直接散落到底床、而非植物间的推测。
补充说明
产地偏远，使这种轮廓独特的彩虹鱼较少出现在水族贸易中。尝试繁殖时应仔细观察实际产卵位置，不能直接认定其他彩虹鱼使用的植物产卵方式一定适用。
图片
图片来自 SeriouslyFish,版权归各摄影者所有。
English
Overview
The slim outline and modest size of Melanotaenia gracilis distinguish it from many deeper-bodied rainbowfishes. It is peaceful but easily alarmed, so a proper group and very gentle circulation are central to its care.
Distribution & habitat
Records come from the Drysdale and Carson river systems in the Kimberley of northwestern Australia. It occupies slow stretches of clear water and may become confined to surrounding pools during the dry season. These habitats are often rocky, with relatively little vegetation.
Aquarium setup
A base of about 75 × 30 cm provides the starting footprint. Gravel, rounded stones, and occasional branches can evoke its sparse river habitat. A densely planted arrangement is also acceptable. Keep water movement low in either layout and provide the relatively hard, neutral to alkaline conditions it favors.
Diet & feeding
It readily accepts a range of dry, frozen, and live foods. Regular suitable live offerings help support its best coloration.
Behaviour & compatibility
Select placid companions of comparable size with matching water requirements. Shared preference for hard water alone does not establish compatibility; temperament and adult size still matter.
Maintain at least six to eight together, with more where space permits. Conspecific company reduces nervousness and encourages male displays.
Sexual dimorphism
Males become larger, brighter, and deeper-bodied than females as they mature.
Breeding
An egg-scattering strategy similar to that of relatives is plausible, but the details remain uncertain. The scarcity of plants in its natural habitat has prompted the suggestion that eggs may fall directly onto the substrate instead of being placed among vegetation. This should be treated as a possibility to investigate, not a confirmed spawning method.
Notes
Its remote distribution helps explain its limited appearance in the hobby. Breeding attempts should pay attention to where eggs are actually deposited rather than assuming that plant-based spawning arrangements used for other rainbowfishes will apply.
来源
- https://www.seriouslyfish.com/species/melanotaenia-gracilis(抓取于 2026-10-10)
melanotaenia-gracilis · 文件: data/species/melanotaenia-gracilis.md · 状态: 草稿