어항에 조개만 넣었는데 물고기가 생긴 이유

<div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin" data-link="http://cafe.daum.net/subdued20club/ReHf" data-link-newwindow="_blank"><a href="http://cafe.daum.net/subdued20club/ReHf" target="_blank" class="ke-link"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/db3bc991cc811264a000cb9ff8aa909ffe0048c9" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/db3bc991cc811264a000cb9ff8aa909ffe0048c9" data-origin-width="474" data-origin-height="227"></a></div><p style="text-align: center;">출처 : <a href="https://youtu.be/1Gu2epM_0Tk" target="_blank" class="ke-link">https://youtu.be/1Gu2epM_0Tk</a></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/a53570fa59aa4830c39a72833f92e9242cd4ae23" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/a53570fa59aa4830c39a72833f92e9242cd4ae23" data-origin-width="640" data-origin-height="358"></div><p style="text-align: left;">민물조개를 데려와서 빈 수조에 투입!<br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/32c6092284a15fe1e0b83ab2a8464f9d7d9ee01d" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/32c6092284a15fe1e0b83ab2a8464f9d7d9ee01d" data-origin-width="640" data-origin-height="355"></div><p style="text-align: left;">꾸물꾸물<br><br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/9231c8ff7c4e2af35c97dee937c1d295e45e56c5" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/9231c8ff7c4e2af35c97dee937c1d295e45e56c5" data-origin-width="640" data-origin-height="356"></div><p style="text-align: left;">조개조개<br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/9bf11447c70ce8fcd5eb8499986b1bd6909e43ac" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/9bf11447c70ce8fcd5eb8499986b1bd6909e43ac" data-origin-width="640" data-origin-height="358"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/1ae72f26747e3274ebc5a9282edcb36bb24685dc" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/1ae72f26747e3274ebc5a9282edcb36bb24685dc" data-origin-width="640" data-origin-height="358"></div><p style="text-align: left;"><br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/6a1bc7d1c4d7fc0f1aff4c66937829316517e28f" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/6a1bc7d1c4d7fc0f1aff4c66937829316517e28f" data-origin-width="640" data-origin-height="358"></div><p style="text-align: left;">조개 안에 알 낳는 납자루<br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/28b5e5fd4be6cf0260b91b9700bcef0fa341b06e" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/28b5e5fd4be6cf0260b91b9700bcef0fa341b06e" data-origin-width="1079" data-origin-height="604"></div><p style="text-align: left;">갸아악</p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/adb524a8315f208b9ddd9727beca5b0327e8de7d" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/adb524a8315f208b9ddd9727beca5b0327e8de7d" data-origin-width="1079" data-origin-height="600"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/51cd660577a721dad2cd71334ce658a17ebfbb5e" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/51cd660577a721dad2cd71334ce658a17ebfbb5e" data-origin-width="1079" data-origin-height="604"></div><p style="text-align: left;">갸아아악</p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/f142812711afb1826ecd8ffc9aeb739b1fc87937" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/f142812711afb1826ecd8ffc9aeb739b1fc87937" data-origin-width="1079" data-origin-height="594"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/cddc2b38414c6d503a5dfd186bbe3b856d76c373" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/cddc2b38414c6d503a5dfd186bbe3b856d76c373" data-origin-width="1079" data-origin-height="604"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/d77b1978bb0ee754a4907f2243649532eab08be8" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/d77b1978bb0ee754a4907f2243649532eab08be8" data-origin-width="1079" data-origin-height="604"></div><p style="text-align: left;">갸아아아아아악<br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1IHuH/9bde52b1ec930c2477123df9011cb4471249725f" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1IHuH/9bde52b1ec930c2477123df9011cb4471249725f" data-origin-width="640" data-origin-height="360"></div><p style="text-align: left;">꼬물꼬물</p><div class="figure-video" data-ke-type="video" data-video-url="https://www.youtube.com/watch?v=1Gu2epM_0Tk" data-video-host="youtube" data-video-play-service="daum_cafe" data-video-width="1280" data-video-height="720" data-ke-style="alignCenter" data-video-thumbnail="http://scrap.kakaocdn.net/dn/BWJHv/hyPBNDRxf3/FX0ntQYgQmTP6X8uRSRyb0/img.jpg?width=1280&height=720&face=0_0_1280_720" data-ke-mobile-mobileStyle="widthFull" data-video-origin-width="0" data-video-origin-height="0"><iframe src="https://www.youtube.com/embed/1Gu2epM_0Tk" width="1280" height="720" frameborder="0" scrolling="no" allowfullscreen=""></iframe><div class="figcaption"></div></div><p style="text-align: left;">신기함.</p>